Table of Contents

If You Need More Information
What is the FSIP?
FSIP Interface Types

Synchronous Serial Distance Limitations
E1-G.703/G.704 Distance Limitations

FSIP Installation Prerequisites

Software Requirements
Startup Error Message
List of Parts and Tools
Safety Guidelines

Safety Warnings
Electrical Equipment
Telephone Wiring
Preventing Electrostatic Discharge Damage

Interface Processor Slot Locations
Guidelines for Interface Processor Removal and Installation

Interface Processor Replacement Procedures

Removing an Interface Processor
Installing an Interface Processor

FSIP Port Adapters, Interface Cables, and Connections

FSIP Interface Cables
FSIP Port Adapter Interface and Cable Pinouts
FSIP Cable Connections

EIA/TIA-232 Connections
EIA/TIA-449 Connections
V.35 Connections
X.21 Connections
EIA-530 Connections
Metric Thumbscrews

Cable Connection Precautions
Attaching Network Interface Cables to the FSIP

Using LEDs to Check FSIP Status
Configuring the FSIP

Interface Port Numbering for the FSIP Serial Interfaces
Configuring the Interfaces
Configuring Timing (Clock) Signals

Setting the Clock Rate
Inverting the Clock Signal

Configuring NRZI Format
Configuring CRCs
Configuring E1-G.703/G.704 Balanced and Unbalanced Modes

Configuring E1-G.703/G.704 Framed and Unframed Operation
Configuring E1-G.703/G.704 CRC-4
Configuring E1-G.703/G.704 Clock Source

Interpreting E1-G.703/G.704 Alarms
Configuring E1-G.703/G.704 Loopback
Replacing Port Adapter Cables and Changing Interface Modes
Using Show Commands to Check the Configuration

Cisco Information Online

Fast Serial Interface Processor (FSIP) Installation and Configuration

Product Numbers: CX-FSIP4=, CX-FSIP8=, PA-7KF-SPA=, UPG-FSIP4, UPG-FSIP8, UPG-7KF-SPA

This configuration note contains instructions for installing and configuring the Fast Serial Interface Processor (FSIP) in Cisco 7000 series or Cisco 7500 series routers. Included are basic configuration steps and examples.

The following sections are included in this configuration note:

• If You Need More Information
  
  
• What is the FSIP?
  
  
• FSIP Interface Types
  
  
• FSIP Installation Prerequisites
  
  
• Interface Processor Replacement Procedures
  
  
• FSIP Port Adapters, Interface Cables, and Connections
  
  
• Using LEDs to Check FSIP Status
  
  
• Configuring the FSIP
  
  
• Cisco Information Online
  
  

If You Need More Information

The Cisco IOS software running your router contains extensive features and functionality. The effective use of many interface processor features is easier if you have more information at hand. For additional information on configuring the Cisco 7000 series and Cisco 7500 series routers and interface processors, the following documentation resources are available:

• Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM, a member of the Cisco Connection Family, is updated monthly. Therefore, it might be more up to date than printed documentation. To order additional copies of the Documentation CD-ROM, contact your local sales representative or call customer service. The CD-ROM package is available as a single package or as an annual subscription. You can also access Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.
  
  

  If you are reading Cisco product documentation on the World Wide Web, you can submit comments electronically. Click Feedback in the toolbar, select Documentation, and click Enter the feedback form. After you complete the form, click Submit to send it to Cisco. We appreciate your comments.

• Refer to the following modular configuration and modular command reference publications, as appropriate for your configuration:
  
  
• Configuration Fundamentals Configuration Guide
  
  
• Configuration Fundamentals Command Reference
  
  
• Security Configuration Guide
  
  
• Security Command Reference
  
  
• Wide-Area Networking Configuration Guide
  
  
• Wide-Area Networking Command Reference
  
  
• Network Protocols Configuration Guide, Parts 1, 2, and 3
  
  
• Network Protocols Command Reference, Parts 1, 2, and 3
  
  
• Bridging and IBM Networking Configuration Guide
  
  
• Bridging and IBM Networking Command Reference
  
  
• Configuration Builder Getting Started Guide
  
  
• Troubleshooting Internetworking Systems
  
  
• Debug Command Reference
  
  
• System Error Messages
  
  
• Cisco IOS Software Command Summary
  
  
• Cisco Management Information Base (MIB) User Quick Reference
  
  
• For hardware installation and maintenance information on the Cisco 7000 series and Cisco 7500 series routers, refer to the hardware installation and configuration documentation that shipped with your router.
  
  
• To obtain general information about documentation, refer to one of the following:
  
  
• The Documentation CD-ROM.
  
  
• The section "Cisco Information Online" on page 47.
  
  
• Customer Service at 800 553-6387 or 408 526-7208. Customer Service hours are 5:00 a.m. to 6:00 p.m. Pacific time, Monday through Friday (excluding company holidays). You can also send e-mail to cs-rep@cisco.com.
  
  
• The Cisco Information Packet that shipped with your router.
  
  

What is the FSIP?

The FSIP (see Figure 1) provides four or eight channel-independent, synchronous serial ports that support full-duplex operation at T1 (1.544 megabits per second [Mbps]) and E1 (2.048 Mbps) speeds. The FSIP ships as Product Numbers CX-FSIP4(=) and CX-FSIP8(=).

The FSIP4 has one module for ports 0-3, and the FSIP8 has two modules, one for ports 0-3 and the other for ports 4-7. To provide a high density of ports, the FSIP uses special port adapters and adapter cables. A port adapter is a daughter board that provides the physical interface for two FSIP serial ports. Each FSIP comprises an FSIP board with two or four port adapters. (One module is equivalent to two port adapters.)

An adapter cable provides the network connection for each port and determines the electrical interface type and mode of that interface. (For more information, refer to the section "FSIP Port Adapters, Interface Cables, and Connections" on page 20.)

Each serial port on the FSIP4 or FSIP8 can transmit and receive data at the rate of 6.132 Mbps; however, if one or more ports consumes the full 6.132 Mbps bandwidth, then we strongly recommend that the remaining ports be administratively shut down.

For example, you can configure four T1 interfaces on a module (one T1 on each port) such that they do not exceed 6.132 Mbps, or you can configure one port to operate at up to 6.132 Mbps, and leave the remaining three ports shut down. Note that some environments will support four E1 interfaces per module without any problems; however, the type of electrical interface, the amount of traffic processed, and the types of external data service units (DSUs) connected to the ports affect actual rates.

FSIP Interface Types

Each port supports any of the available interface types: Electronics Industries Association/Telecommunications Industries Association (EIA/TIA)-232, EIA/TIA-449, E1-G.703/G.704, V.35, X.21, and EIA-530.

All interface types except EIA-530 can be individually configured for operation with either external (data terminal equipment [DTE] mode) or internal (data communications equipment [DCE] mode) timing signals; EIA-530 operates with external timing only.

In addition, all FSIP interface types support nonreturn to zero (NRZ) and nonreturn to zero inverted (NRZI) format, and both 16-bit and 32-bit cyclic redundancy checks (CRCs). The default configuration is for NRZ format and 16-bit CRC. You can change the default settings with software commands. (See the section "Configuring the FSIP" on page 37.)

There is no default mode or clock rate set on the FSIP ports, although an internal clock signal is present on all ports for DCE support. The internal clock also allows you to perform local loopback tests without having to terminate the port or connect a cable. (All interface types except X.21 DTE support loopback.)

To use the port as a DCE interface, you must set the clock rate and connect a DCE adapter cable. To use the port as a DTE interface, you need only connect a DTE adapter cable to the port. Because the serial adapter cables determine the mode and interface type, the FSIP port becomes a DTE when a DTE cable is connected to it.

If a DTE cable is connected to a port with a clock rate set (using the clockrate command), the DTE ignores the clock rate and uses the external clock signal that is sent from the remote DCE. (For a brief description of the clockrate command, refer to the section "Configuring Timing (Clock) Signals" on page 39.)

Each E1-G.703/G.704 interface is a 2.048-megabit per second (Mbps), E1 telecommunications interface; all the other available FSIP interfaces are synchronous serial data communications interfaces. G.703 is an International Telecommunication Union Telecommunication Standardization Sector (ITU-T) electrical and mechanical specification for connections between telecommunications interfaces and data communications equipment (DTE).

Typically, G.703 provides a means of connecting standard serial interfaces such as V.35 to telephone lines or Postal Telephone and Telegraph (PTT) networks. The E1-G.703/G.704 port adapter supports point-to-point connections to Cisco 7000 series and Cisco 7500 series routers from 2.048-Mbps, E1 leased-line services, and eliminates the need for a separate, external data termination unit that is typically used to convert standard serial interfaces, such as V.35, to E1-G.703/G.704.

Synchronous Serial Distance Limitations

Serial signals can travel a limited distance at any given bit rate; generally, the slower the baud rate, the greater the distance. All serial signals are subject to distance limits beyond which a signal degrades significantly or is completely lost. Table 1 lists the recommended maximum speeds and distances for each FSIP serial interface type.

Balanced drivers allow EIA/TIA-449 signals to travel greater distances than EIA/TIA-232. The recommended distance limits for EIA/TIA-449 shown in Table 1 are also valid for V.35, X.21, and EIA-530. However, you can get good results at distances and rates far greater than these. While EIA/TIA-449 and EIA-530 support 2-Mbps rates, and V.35 supports 4-Mbps rates without any problems, we do not recommend exceeding published specifications for transmission speed versus distance; do so at your own risk.

E1-G.703/G.704 Distance Limitations

Unbalanced G.703 interfaces allow for a longer maximum cable length than those specified for balanced circuits. Table 2 lists the maximum cable lengths for each FSIP E1-G.703/G.704 cable type by the connector used at the network (non-FSIP) end.

FSIP Installation Prerequisites

Before you install the FSIP, ensure that your existing system components meet the compatibility requirements described in this section. You should also review the safety and ESD-prevention guidelines for avoiding bodily injury or equipment damage, and the list of parts and tools you will need to perform the installation.

Software Requirements

The FSIP is compatible with any Cisco 7000 series router that is operating with the following software and microcode:

• Software Release 9.17(5) or later
  
  
• SP Microcode Version 1.4 or later on ROM
  
  
• The system is configured to load SP Microcode Version 1.4 from ROM or a later version of SP microcode from ROM or a file stored in Flash memory.
  
  

Caution SP Microcode Version 1.4 must reside in ROM; it cannot be loaded from Flash memory. During the boot process, the system accesses the SP (or SSP) microcode. If the SP microcode ROM contains a version earlier than 1.4 and the router contains an FSIP, the system might fail to boot properly.

Various show commands allow you to display and verify system status and configuration information. The show version command displays the current hardware configuration and the currently loaded and running version of system software. The show controllers cxbus command lists all interfaces and includes the currently loaded and running microcode version for each. You can check the version of the default ROM image either by removing the board and checking the ROM labels or by configuring the system to load the microcode from ROM, restarting the system, and using these same commands to check the running version. For details of these commands, refer to the section "Using Show Commands to Check the Configuration" on page 46.

Startup Error Message

When the system starts up, it looks for boot instructions in the system configuration file and hardware configuration register. These instructions cause the system to boot from one of three possible sources: the default ROM software, an image stored in Flash memory, or a remote server. Because the system must be able to retrieve and interpret these instructions before it can execute them, it always performs a partial boot from the default ROMs first and, after retrieving the instructions, it executes them and reboots if necessary.

In Cisco 7000 series routers, this partial boot is usually transparent to the user; however, it may generate a harmless error message if the system ROMs contain a software version earlier than Maintenance Release 9.17(5).

In the Cisco 7000 series, Maintenance Release 9.17(5) supports the FSIP, but earlier releases will not recognize it. If the software ROMs in your system contain Maintenance Release 9.17(4) or earlier, the initial, partial boot from that ROM image can cause the following message to be displayed:

%UCODE-3-LDFAIL: Unable to download ucode FSIPn-n in slot 0, installed ucode loaded 

must be a SIP serial interface
Booting gs7-k...
 

This message, which is displayed at each subsequent system startup (unless you remove the FSIP or replace the system software ROMs with Maintenance Release 9.17[5] or later ROMs), does not indicate a problem and should be ignored.

List of Parts and Tools

You need the following tools and parts to install or upgrade an FSIP. If you need additional equipment, contact your service representative for ordering information.

• Number 2 Phillips screwdriver
  
  
• 3/16-inch flat-blade screwdriver
  
  
• Serial interface cable to connect the FSIP with the network
  
  
• ESD cord and wrist strap
  
  

Safety Guidelines

This section lists safety guidelines to follow when working with any equipment that connects to electrical power or telephone wiring.

Safety Warnings

Safety warnings appear throughout this publication in procedures that, if performed incorrectly, might harm you. A warning symbol precedes each warning statement.

Warning  

Means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device.

Waarschuwing  Dit waarschuwingssymbool betekent gevaar. U verkeert in een situatie die lichamelijk letsel kan veroorzaken. Voordat u aan enige apparatuur gaat werken, dient u zich bewust te zijn van de bij elektrische schakelingen betrokken risico's en dient u op de hoogte te zijn van standaard maatregelen om ongelukken te voorkomen. Voor vertalingen van de waarschuwingen die in deze publicatie verschijnen, kunt u het document Regulatory Compliance and Safety Information (Informatie over naleving van veiligheids- en andere voorschriften) raadplegen dat bij dit toestel is ingesloten.

Varoitus  Tämä varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi johtaa ruumiinvammaan. Ennen kuin työskentelet minkään laitteiston parissa, ota selvää sähkökytkentöihin liittyvistä vaaroista ja tavanomaisista onnettomuuksien ehkäisykeinoista. Tässä julkaisussa esiintyvien varoitusten käännökset löydät laitteen mukana olevasta Regulatory Compliance and Safety Information -kirjasesta (määräysten noudattaminen ja tietoa turvallisuudesta).

Attention  Ce symbole d'avertissement indique un danger. Vous vous trouvez dans une situation pouvant causer des blessures ou des dommages corporels. Avant de travailler sur un équipement, soyez conscient des dangers posés par les circuits électriques et familiarisez-vous avec les procédures couramment utilisées pour éviter les accidents. Pour prendre connaissance des traductions d'avertissements figurant dans cette publication, consultez le document Regulatory Compliance and Safety Information (Conformité aux règlements et consignes de sécurité) qui accompagne cet appareil.

Warnung  Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation, die zu einer Körperverletzung führen könnte. Bevor Sie mit der Arbeit an irgendeinem Gerät beginnen, seien Sie sich der mit elektrischen Stromkreisen verbundenen Gefahren und der Standardpraktiken zur Vermeidung von Unfällen bewußt. Übersetzungen der in dieser Veröffentlichung enthaltenen Warnhinweise finden Sie im Dokument Regulatory Compliance and Safety Information (Informationen zu behördlichen Vorschriften und Sicherheit), das zusammen mit diesem Gerät geliefert wurde.

Avvertenza  Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe causare infortuni alle persone. Prima di lavorare su qualsiasi apparecchiatura, occorre conoscere i pericoli relativi ai circuiti elettrici ed essere al corrente delle pratiche standard per la prevenzione di incidenti. La traduzione delle avvertenze riportate in questa pubblicazione si trova nel documento Regulatory Compliance and Safety Information (Conformità alle norme e informazioni sulla sicurezza) che accompagna questo dispositivo.

Advarsel  Dette varselsymbolet betyr fare. Du befinner deg i en situasjon som kan føre til personskade. Før du utfører arbeid på utstyr, må du vare oppmerksom på de faremomentene som elektriske kretser innebærer, samt gjøre deg kjent med vanlig praksis når det gjelder å unngå ulykker. Hvis du vil se oversettelser av de advarslene som finnes i denne publikasjonen, kan du se i dokumentet Regulatory Compliance and Safety Information (Overholdelse av forskrifter og sikkerhetsinformasjon) som ble levert med denne enheten.

Aviso  Este símbolo de aviso indica perigo. Encontra-se numa situação que lhe poderá causar danos físicos. Antes de começar a trabalhar com qualquer equipamento, familiarize-se com os perigos relacionados com circuitos eléctricos, e com quaisquer práticas comuns que possam prevenir possíveis acidentes. Para ver as traduções dos avisos que constam desta publicação, consulte o documento Regulatory Compliance and Safety Information (Informação de Segurança e Disposições Reguladoras) que acompanha este dispositivo.

¡Advertencia!  Este símbolo de aviso significa peligro. Existe riesgo para su integridad física. Antes de manipular cualquier equipo, considerar los riesgos que entraña la corriente eléctrica y familiarizarse con los procedimientos estándar de prevención de accidentes. Para ver una traducción de las advertencias que aparecen en esta publicación, consultar el documento titulado Regulatory Compliance and Safety Information (Información sobre seguridad y conformidad con las disposiciones reglamentarias) que se acompaña con este dispositivo.

Varning!  Denna varningssymbol signalerar fara. Du befinner dig i en situation som kan leda till personskada. Innan du utför arbete på någon utrustning måste du vara medveten om farorna med elkretsar och känna till vanligt förfarande för att förebygga skador. Se förklaringar av de varningar som förkommer i denna publikation i dokumentet Regulatory Compliance and Safety Information (Efterrättelse av föreskrifter och säkerhetsinformation), vilket medföljer denna anordning.

Electrical Equipment

Follow these basic guidelines when working with any electrical equipment:

• Before beginning any procedures requiring access to the chassis interior, locate the emergency power-off switch for the room in which you are working.
  
  
• Disconnect all power and external cables before moving a chassis.
  
  
• Do not work alone if potentially hazardous conditions exist.
  
  
• Never assume that power is disconnected from a circuit; always check.
  
  
• Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
  
  
• Carefully examine your work area for possible hazards such as moist floors, ungrounded power extension cables, and missing safety grounds.
  
  

Telephone Wiring

Use the following guidelines when working with any equipment that is connected to telephone wiring or to other network cabling:

• Never install telephone wiring during a lightning storm.
  
  
• Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.
  
  
• Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface.
  
  
• Use caution when installing or modifying telephone lines.
  
  

Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) damage, which can occur when electronic cards or components are improperly handled, results in complete or intermittent failures. Electromagnetic interference (EMI) shielding, connectors, and a handle are integral components of the carrier. Although the metal carrier helps to protect the board from ESD, use a preventive antistatic strap whenever handling an interface processor. Handle the carriers by the handles and the carrier edges only; never touch the boards or connector pins.

Following are guidelines for preventing ESD damage:

• Always use an ESD-preventive wrist or ankle strap and ensure that it makes good skin contact; connect the equipment end of the strap to a captive installation screw on an installed power supply.
  
  
• When installing an interface processor, use the ejector levers to properly seat the bus connectors in the backplane, then tighten both captive installation screws. These screws prevent accidental removal, provide proper grounding for the system, and help ensure that the bus connectors are seated in the backplane.
  
  
• When removing an interface processor, use the handle to pull the interface processor out slowly while keeping your other hand underneath the carrier to guide it straight out of the slot.
  
  
• Handle carriers by the handles and carrier edges only; avoid touching the board or connectors.
  
  
• Place a removed interface processor board-side-up on an antistatic surface or in a static shielding bag. If you plan to return the component to the factory, immediately place it in a static shielding bag.
  
  
• Avoid contact between the interface processor and clothing. The wrist strap only protects the board from ESD voltages on the body; ESD voltages on clothing can still cause damage.
  
  
• Never attempt to remove an interface processor printed circuit board from the metal interface processor carrier.
  
  

Caution For safety, periodically check the resistance value of the antistatic strap. The measurement should be between 1 and 10 megohms.

Interface Processor Slot Locations

The FSIP is installed in the interface processor slots in the Cisco 7000 series and Cisco 7500 series routers. The interface processor slots in the Cisco 7000 series and Cisco 7500 series routers are as follows:

• Cisco 7000—slots 0 through 4 (See Figure 2.)
  
  
• Cisco 7010—slots 0 through 2 (See Figure 3.)
  
  
• Cisco 7505—slots 0 through 3 (See Figure 4.)
  
  
• Cisco 7507—slots 0 and 1, and slots 4 through 6 (See Figure 5.)
  
  
• Cisco 7513—slots 0 through 5, and slots 8 through 12 (See Figure 6.)
  
  

Guidelines for Interface Processor Removal and Installation

This section describes the mechanical functions of system components and emphasizes the importance of following correct procedures to avoid unnecessary board failures. Specific procedures follow these general background and safety guidelines in the section "Interface Processor Replacement Procedures" on page 15.

You can remove and replace interface processors while the system is operating; you do not need to notify the software or reset the system power. This functionality enables you to add, remove, or replace interface processors with the system online, which provides a method that is seamless to end users on the network, maintains all routing information, and ensures session preservation.

After an interface processor is reinstalled, the system brings on line only interfaces that match the current configuration and were previously configured as up; all others require that you configure them with the configure command.

Caution The system can indicate a hardware failure if you do not follow proper procedures. Remove or insert only one interface processor at a time. Allow at least 15 seconds for the system to complete the preceding tasks before removing or inserting another interface processor. Disrupting the sequence before the system completes its verification can cause the system to interpret hardware failures.

All interface processors have ejector levers that allow you to firmly seat an interface processor in the interface processor slot (see Figure 8). The function of the ejector levers is to align and seat the card connectors in the backplane. Failure to use the ejector levers and insert the interface processor properly can disrupt the order in which the pins make contact with the backplane.

Follow the installation and removal instructions carefully, and review the following examples of incorrect insertion practices and results:

It is also important to use the ejector levers when removing an interface processor to ensure that the board connector pins disconnect from the backplane in the logical sequence expected by the system. Any processor module (interface processor or RSP) that is only partially connected to the backplane can hang the bus. (Detailed steps for correctly installing and removing an interface processor follow in the section "Interface Processor Replacement Procedures.")

Interface Processor Replacement Procedures

Typically, your interface processors arrive preinstalled in your Cisco 7000 series and Cisco 7500 series routers (with the exception of the Cisco 7513); however, occasionally you might have to remove and replace interface processors for maintenance.

The following sections describe the procedures for removing or installing an interface processor. (Refer the section "Guidelines for Interface Processor Removal and Installation" before removing an interface processor while power to the system is on.)

Caution To avoid erroneous failure messages, remove or insert only one interface processor at a time. Also, after inserting or removing an interface processor, allow at least 15 seconds before removing or inserting another interface processor so that the system can reinitialize and note the current configuration of all interfaces.

Removing an Interface Processor

If you are replacing a failed interface processor, remove the existing board first, then install the new interface processor in the same slot.

Figure 7 shows proper handling of an interface processor during installation. Before you remove an interface processor that you will not replace, or replace an interface processor component, we recommend you shut down (disable) the interfaces to prevent anomalies when you reinstall the new or reconfigured interface processor. When you shut down an interface, it is designated administratively down in the show command displays.

Step 2   Loosen the captive installation screws at the ends of the interface processor faceplate. (See Figure 8a.)

Caution Always use the ejector levers to remove or install an interface processor. Failure to do so can cause erroneous system error messages, indicating a board failure.

Step 3   Place your thumbs on the upper and lower ejector levers and simultaneously push the top ejector lever up and the bottom ejector lever down (in the opposite direction from that shown in Figure 8c) to release an interface processor from the backplane connector.

Step 4   Grasp the interface processor handle with one hand and place your other hand under the carrier to guide the interface processor out of the slot. (See Figure 7.) Avoid touching the board or any connector pins.

Step 5   Carefully pull the interface processor straight out of the slot, keeping one hand under the carrier to guide it. (See Figure 7.) Keep the interface processor parallel to the backplane.

Step 6   Place the removed interface processor on an antistatic mat or foam pad, or place it in an antistatic bag if you will return it to the factory.

Step 7   If the interface processor slot is to remain empty, install an interface processor filler (MAS-7000BLANK=) to keep dust out of the chassis and to maintain proper airflow through the interface processor compartment.

Installing an Interface Processor

Interface processors slide into any available interface processor slot and connect directly to the backplane. The backplane slots are keyed so that interface processors can be installed only in interface processor slots. Interface processor fillers, which are blank interface processor carriers, occupy empty slots to maintain consistent air flow through the interface processor compartment.

If you install a new interface processor, you have to first remove the interface processor filler from the available interface processor slot. Figure 8 shows functional details of inserting an interface processor and using ejector levers. (Figure 7 shows proper handling of an interface processor during installation.)

Caution Remove or insert only one interface processor at a time. Allow at least 15 seconds for the system to complete the preceding tasks before removing or inserting another interface processor. Disrupting the sequence before the system completes its verification can cause the system to interpret this as a hardware failure.

Use the following procedure to install an interface processor:

Step 1   Ensure that a console terminal is connected to the RP (or RSP) Console port and that the console is turned on.

Step 2   Choose an available interface processor slot for the interface processor, and ensure that the interface processor's cable is of a sufficient length to connect the interface processor with any external equipment. We recommend that you install interface processors starting with the slots closest to the RSPs and work out concentrically from there. This will help prevent EMI.

Step 3   Interface processors and interface processor fillers are secured with two captive installation screws. (See Figure 8a.) Use a flat-blade screwdriver to loosen the captive installation screws and remove the interface processor filler (or the existing interface processor) from the slot. If you remove an interface processor, immediately place it in an antistatic bag to prevent damage from electrostatic discharge.

Step 4   Hold the interface processor handle with one hand, and place your other hand under the carrier to support the interface processor (see Figure 7); guide the carrier into the slot. Avoid touching the card or any connector pins.

Caution To prevent ESD damage, handle interface processors by the handles and carrier edges only.

Step 5   Place the back of the interface processor in the slot and align the notch on the bottom of the carrier with the groove in the slot. (See Figure 8a.)

Step 6   While keeping the interface processor parallel to the backplane, carefully slide the interface processor into the slot until the back of the faceplate makes contact with the ejector levers, then stop. (See Figure 8b.)

Caution Always use the ejector levers when installing or removing processor modules. A module that is partially seated in the backplane will cause the system to hang and subsequently crash.

Step 7   Using the thumb and forefinger of each hand to pinch each ejector lever, simultaneously push the top ejector lever down and the bottom ejector lever up until both are parallel to the faceplate. (See Figure 8c.)

Step 8   Tighten the captive screws on the top and bottom of the interface processor faceplate to prevent the interface processor from becoming partially dislodged from the backplane and ensure proper EMI shielding. (These screws must be tightened to meet EMI specifications.)

Caution To ensure adequate space for additional interface processors, always tighten the captive installation screws on each newly installed interface processor before you insert any additional interface processors. These screws also prevent accidental removal, and provide proper grounding and EMI shielding for the system.

FSIP Port Adapters, Interface Cables, and Connections

The universal port adapters and adapter cables allow eight interface ports on an FSIP, regardless of the size of the connectors typically used with each electrical interface type. (See Figure 9.)

FSIP Interface Cables

Each port requires a serial interface adapter cable that provides the interface between the high-density FSIP port and the standard connectors that are commonly used for each electrical interface type. Rate of data transmission depends on the type of electrical interface: EIA/TIA-232 for speeds of 64 kilobits per second (kbps) and below; X.21, EIA/TIA-449, V.35, or EIA-530 for higher speeds.

The router (FSIP) end of all adapter cables is a 60-pin, D-shell plug that connects to the 60-pin port on the FSIP. The network end of the cable is an industry-standard connector for the type of electrical interface that the cable supports. For most interface types, the adapter cable for DTE mode uses a plug at the network end, and the cable for DCE mode uses a receptacle at the network end. Exceptions are V.35 adapter cables, which are available with either a V.35 plug or a receptacle for either mode, and the EIA-530 adapter cable, which is available only in DTE mode with a DB-25 plug at the network end.

The mode (DCE or DTE) is labeled on the molded plastic connector shell at the ends of all cables except V.35 (which uses the standard Winchester block-type connector instead of a molded plastic D-shell).

Following are the available port adapter and cable options for the E1-G.703/G.704 interface:

For replacement instructions, refer to the configuration note that shipped with your replacement port adapter. For cable pinouts, refer to the section "FSIP Port Adapter Interface and Cable Pinouts" on page 23.

Figure 10 shows the synchronous serial port adapter cables for connecting the FSIP port adapters to your network.

Figure 11, Figure 12, and Figure 13 show the unbalanced and balanced cables used for connecting the E1-G.703/G.704 port adapter and your network. The port-adapter end of each cable has a DB-15 connector.

Caution It is a requirement of the statutory approval of the E1-G.703/G.704 interface that the jackscrews of the connector backshell be securely screwed down while the FSIP is operating.

Metric (M3) thumbscrews are included with each port adapter cable to allow connections to devices that use metric hardware. Because the FSIP uses a special, high-density port that requires special adapter cables for each electrical interface type, we recommend that you obtain serial interface cables from the factory.

FSIP Port Adapter Interface and Cable Pinouts

The FSIP supports EIA/TIA-232, EIA/TIA-449, X.21, V.35, and EIA-530 serial interfaces and the E1-G.703/G.704 interface. All FSIP ports use a universal port adapter, which is a 60-pin receptacle that supports all available interface types. A special synchronous serial adapter cable, which is required for each synchronous port, determines the electrical interface type and mode of the synchronous serial interface. The router (FSIP) end of all of the adapter cables is a 60-pin plug; the connectors at the network end are the standard connectors used for the respective interfaces. An exception to this is the E1-G.703/G.704 port adapter, which uses a 15-pin, D-shell receptacle.

• Table 3, on page 24, lists the EIA/TIA-232 pinouts
  
  
• Table 4, on page 25, lists the EIA/TIA-449 pinouts
  
  
• Table 5, on page 26, lists the X.21 pinouts
  
  
• Table 6, page 27, lists the V.35 pinouts
  
  
• Table 7, on page 28, lists the EIA-530 pinouts
  
  
• Table 8, on page 29, lists the E1-G.703/G.704 pinouts
  
  

FSIP Cable Connections

This section provides information on the synchronous serial interface connectors used on the FSIP synchronous serial cables.

• EIA/TIA-232 Connections
  
  
• EIA/TIA-449 Connections
  
  
• V.35 Connections
  
  
• X.21 Connections
  
  
• EIA-530 Connections
  
  
• Metric Thumbscrews
  
  

EIA/TIA-232 Connections

EIA/TIA-232 supports unbalanced circuits at signal speeds up to 64 kbps. The router (FSIP) end of all EIA/TIA-232 adapter cables is a high-density 60-pin plug. The opposite (network) end of the adapter cable is a standard 25-pin D-shell connector (known as a DB-25) that is commonly used for EIA/TIA-232 connections. Figure 14 shows the connectors at the network end of the adapter cable.

EIA/TIA-449 Connections

EIA/TIA-449, which supports balanced (EIA/TIA-422) and unbalanced (EIA/TIA-423) transmissions, is a faster (up to 2 Mbps) version of EIA/TIA-232, which provides more functions and supports transmissions over greater distances. The EIA/TIA-449 standard was intended to replace EIA/TIA-232, but it was not widely adopted. The resistance to convert to EIA/TIA-449 was due primarily to the large installed base of DB-25 hardware and to the larger size of the 37-pin EIA/TIA-449 connectors, which limited the number of connections possible (fewer than is possible with the smaller, 25-pin EIA/TIA-232 connector).

Figure 15 shows the connectors at the network end of the adapter cable.

V.35 Connections

The V.35 interface is recommended for speeds up to 48 kbps (although in practice it is used successfully at up to 4 Mbps).

The router (FSIP) end of all V.35 adapter cables is a high-density 60-pin plug. The opposite (network) end of the adapter cable provides a standard, 34-pin Winchester-type connector commonly used for V.35 connections.

Figure 16 shows the connectors at the network end of the V.35 adapter cable.

X.21 Connections

The X.21 interface uses a 15-pin connection for balanced circuits and is commonly used in the United Kingdom to connect public data networks. The X.21 interface relocates some of the logic functions to the DTE and DCE interfaces and, as a result, requires fewer circuits and a smaller connector than EIA/TIA-232.

The router (FSIP) end of all X.21 adapter cables is a high-density 60-pin plug. The opposite (network) end of the adapter cable is a standard DB-15 connector.

Figure 17 shows the connectors at the network end of the X.21 adapter cable.

EIA-530 Connections

The EIA-530 interface, which supports balanced transmission, provides the increased functionality, speed, and distance of EIA/TIA-449 on the smaller, DB-25 connector used for EIA/TIA-232. The EIA-530 interface is used primarily in the United States. The EIA-530 standard was created to support the more sophisticated circuitry of EIA/TIA-449 on the large number of existing EIA/TIA-232 (DB-25) hardware. Like EIA/TIA-449, EIA-530 refers to the electrical specifications of EIA/TIA-422 and EIA/TIA-423. Although the specification recommends a maximum speed of 2 Mbps, EIA-530 is used successfully at 4 Mbps and at even faster speeds over short distances.

The router (FSIP) end of the EIA-530 adapter cable is a high-density 60-pin plug. The opposite (network) end of the adapter cable is a standard DB-25 plug commonly used for EIA/TIA-232 connections.

Figure 18 shows the DB-25 connector at the network end of the adapter cable.

Metric Thumbscrews

A pair of metric thumbscrews is included with each port adapter cable except V.35. If you plan to connect serial cables to a remote device that uses metric hardware, replace the standard 4-40 thumbscrews at the network end of the cable with the metric, M3 thumbscrews.

To remove thumbscrews, use the flat side of a large (1/4-inch) flat-blade screwdriver to push the tip of the screw into the connector housing and out the other side. (See Figure 19.) If the screw resists, use pliers to pull it out. Insert the new thumbscrew and push it into the connector housing until it pops into place.

Cable Connection Precautions

The router (port adapter) end of the FSIP serial interface cables must be connected to the 60-pin receptacles on the port adapter as shown at the top of Figure 20. Although the 60-pin plug on each cable is keyed for proper insertion, it can be forced onto the port adapter's receptacle if you are not careful. Also, older serial cables, with fewer pins, cannot be used for the 60-pin receptacle on the port adapter.

Attaching Network Interface Cables to the FSIP

All FSIP ports support any available synchronous serial interface type and mode. The serial adapter cable determines the electrical interface type and mode of the port to which it is connected. E1-G.703/G.704, EIA/TIA-232, EIA/TIA-449, V.35, and X.21 interfaces are available in DTE mode with a plug at the network end and in DCE mode with a receptacle at the network end. EIA-530 is available only in DTE mode with a plug. Connect the FSIP serial cables as shown in Figure 21; however, observe the connection precautions indicated in the section "Cable Connection Precautions" on page 32.

When you connect serial devices, consider the adapter cables as an extension of the router for external connections. Therefore, use DTE cables to connect the router to remote DCE devices such as modems or DSUs, and use DCE cables to connect the router to remote DTE devices such as a host server, PC, or another router.

Using LEDs to Check FSIP Status

The FSIP has several status LEDs on its faceplate, next to each port, which indicate conditions on that port. (See Figure 22.)

Figure 23 shows the signal flow between DTE and DCE devices and the LEDs that correspond to signals for each mode.

Table 9 lists the LED states for ports in DTE and DCE mode; a more complete explanation follows.

Step 2   When the reinitialization is complete, verify that the enabled LED on the FSIP is on and remains on. If the LED does stay on, proceed to Step 5. If the enabled LED does not stay on, proceed to the next step.

Step 3   If the enabled LED on the FSIP fails to go on, suspect that the FSIP board connector is not fully seated in the backplane. Loosen the captive installation screws, then firmly push the ejector levers until both are parallel to the FSIP faceplate. Tighten the captive installation screws. After the system reinitializes the interfaces, the enabled LED on the FSIP should go on. If the enabled LED goes on, proceed to Step 5. If the enabled LED does not go on, proceed to the next step.

Step 4   If the enabled LED still fails to go on, remove the FSIP and try installing it in another available interface processor slot.

• If the enabled LED goes on when the FSIP is installed in the new slot, suspect a failed backplane port in the original interface processor slot.
  
  
• If the enabled LED still fails to go on, but other LEDs on the FSIP go on to indicate activity, proceed to Step 5 to resume the installation checkout and suspect that the enabled LED on the FSIP has failed.
  
  
• If no LEDs on the FSIP go on, suspect that the FSIP is faulty.
  
  
• If the enabled LED still does not go on, do not proceed with the installation. Contact a service representative to report the faulty equipment and obtain further instructions.
  
  

Step 5   Use the show interfaces or show controllers cbus command to verify the status of the FSIP interfaces. (If the FSIP interfaces are not configured, configure them using the procedures in the section "Configuring the FSIP.")

If an error message displays on the console terminal, refer to the appropriate reference publication for error message definitions. If you experience other problems that you are unable to solve, contact a service representative for assistance.

Configuring the FSIP

If you want to change the configuration of an existing interface, you must enter configuration mode to configure the interface. If you replaced an FSIP that was previously configured, the system will recognize the new FSIP interfaces and bring each of them up in their existing configuration.

For complete descriptions of configuration subcommands and the configuration options available for serial interfaces, refer to the appropriate software documentation listed in the section "If You Need More Information" on page 2.

Configuring the FSIP first requires privileged-level access to the EXEC command interpreter. Also, privileged-level access usually requires a password. (Contact your system administrator, if necessary, to obtain privileged-level access.)

Interface Port Numbering for the FSIP Serial Interfaces

Cisco 7000 series and Cisco 7500 series routers identify an interface address by its interface processor slot number and port number in the format slot/port. Each FSIP contains either four or eight serial interfaces. Ports are numbered sequentially beginning with interface 0. For example, the slot/port address of the first interface on an FSIP installed in interface processor slot 0 is 0/0, and the adjacent port on the same FSIP is 0/1.

Configuring the Interfaces

The following instructions are provided for performing a basic configuration: enabling an interface, specifying IP routing, and setting up external timing on a DCE interface. You might also need to enter other configuration subcommands, depending on the requirements for your system configuration and the protocols you plan to route on the interface.

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#
 

Router(config)# interface serial 0/0

Router(config-if)# ip address 1.1.1.67 255.255.255.0 

 

Step 5   If you are configuring a DTE interface, proceed to step 7. If you are configuring a DCE interface, you also need to configure the external clock signal, as described in the next step.

Step 6   Set the clock rate with the clockrate command. (For a description of the clockrate command, refer to the section "Configuring Timing (Clock) Signals" which follows.)

Router(config-if)# clockrate 72000

 

Step 7   Change the shutdown state to up and enable the interface as follows:

Router(config-if)# no shutdown

 

Router# copy running-config startup-config

[OK]
Router#
 

Router# disable

Router> 

 

Configuring Timing (Clock) Signals

All interfaces support both DTE and DCE mode (except the EIA/TIA-530 interface, which is DTE only). The mode of the interface cable attached to the port. To use a port as a DTE interface, you must connect a DTE adapter cable to the port. When the system detects the DTE mode cable, it automatically uses the external timing signal.

Setting the Clock Rate

All DCE interfaces require a noninverted internal transmit clock signal, which is generated by the FSIP. The default operation on an FSIP DCE interface is for the DCE device (FSIP) to generate its own Transmit Clock (TxC) signal and send it to the remote DTE. The remote DTE device returns the clock signal to the DCE (FSIP port). The clockrate command specifies the rate as a bits-per-second value.

Router(config)# interface serial 0/0

Router(config-if)# clockrate 72000

 

Inverting the Clock Signal

Systems that use long cables can experience high error rates when operating at higher transmission speeds. Slight variances in cable construction, temperature, and other factors can cause the clock and data signals to shift out of phase. If an FSIP DCE port is reporting a high number of error packets, a phase shift might be the problem. Inverting the clock can often correct this shift.

Router(config)# interface serial 0/0

Router(config-if)# transmit-clock-internal

 

Configuring NRZI Format

All interfaces support both NRZ and NRZI formats. Both formats use two different voltage levels for transmission. NRZ signals maintain constant voltage levels with no signal transitions (no return to a zero voltage level) during a bit interval and are decoded using absolute values (0 and 1). NRZI uses the same constant signal levels, but interprets the presence of data at the beginning of a bit interval as a signal transition and the absence of data as no transition. NRZI uses differential encoding to decode signals rather than determining absolute values.

NRZ format, the factory default on all interfaces, is most common. NRZI format, which is configured with a software command, is commonly used with EIA/TIA-232 connections in IBM environments. To enable NRZI encoding on any interface, specify the slot and port address of the interface followed by the command nrzi-encoding. Enter Ctrl-Z when you have finished with the configuration change. In the example that follows, the first serial port on an FSIP in interface processor slot 0 is configured for NRZI encoding:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# interface serial 0/0

Router(config-if)# nrzi-encoding 

Router(config-if)# ^Z

 

Configuring CRCs

The cyclic redundancy check (CRC) is an error-checking technique that uses a calculated numeric value to detect errors in transmitted data. All interfaces use a 16-bit CRC by default, but also support a 32-bit CRC. The sender of a data frame divides the bits in the frame message by a predetermined number to calculate a remainder or frame check sequence (FCS). Before it sends the frame, the sender appends the FCS value to the message so that the frame contents are exactly divisible by the predetermined number. The receiver divides the frame contents by the same predetermined number that the sender used to calculate the FCS. If the result is not 0, the receiver assumes that a transmission error occurred and sends a request to the sender to resend the frame.

To enable 32-bit CRC on an interface, specify the slot and port address of the interface followed by the command crc32. In the example that follows, the first serial port on an FSIP in interface processor slot 0 is configured for 32-bit CRC:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# interface serial 0/0

Router(config-if)# crc32 

Ctrl-Z

 

For additional command descriptions and examples, refer to the related software configuration documentation listed in the section "If You Need More Information" on page 2.

Configuring E1-G.703/G.704 Balanced and Unbalanced Modes

The E1-G.703/G.704 interface is available in either balanced or unbalanced mode. A unique port adapter supports each type. Neither the modes nor the cables are interchangeable; you cannot configure a balanced port to support an unbalanced line, nor can you attach an interface cable intended for a balanced port to an unbalanced port.

Router# show controllers cbus

 
(additional displayed text omitted from this example)
 
 FSIP 0, hardware version 1.0, microcode version 1.0
 
  Interface 8 - Serial0/0, electrical interface is E1-G.703, balanced
 
  Interface 9 - Serial0/1, electrical interface is E1-G.703, balanced
 
(additional displayed text omitted from this example)

Configuring E1-G.703/G.704 Framed and Unframed Operation

The E-G.703 interface is divided into 32 time slots, or frames. (See Figure 24.) Each of the 32 time slots is an 8-bit frame that transmits data at 64 kbps. Each of these time slots can be configured to carry data or to remain empty. (The E1-G.703/G.704 port adapter inserts an idle pattern into empty time slots.)

[no] timeslot 0/start-slot-31/stop_slot 
 

Router# timeslot 1-13

 

Configuring E1-G.703/G.704 CRC-4

Framed mode supports a 4-bit CRC, which you enable with a software command. CRC-4 is a 4-bit error checking technique that uses a calculated numeric value to perform an ongoing data integrity check and detect errors in transmitted data. The E1-G.703/G.704 interface supports CRC in framed mode only. By default, CRC-4 is not enabled. To enable CRC-4 on the E1 interface, specify the slot and port address of the interface followed by the command crc4. Press Ctrl-Z after altering the configuration and before exiting configuration mode.

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# interface serial 0/0

Router(config-if)# crc4 

Ctrl-Z

 

Configuring E1-G.703/G.704 Clock Source

The E1-G.703/G.704 interface does not operate in the DTE and data communications equipment (DCE) modes that are typical of data communications interfaces. The E1-G.703/G.704 interface operates with either a line-recovered or an internal clock signal. The default is for a line clock signal that the interface recovers from the received data stream. The interface can also operate with an internal clock signal. The E1-G.703/G.704 port adapter generates the internal clock signal; the interface does not use the FSIP clock.

Interpreting E1-G.703/G.704 Alarms

The following defines and describes the five alarms used with the E1-G.703/G.704 interface:

Configuring E1-G.703/G.704 Loopback

The E1-G.703/G.704 interface supports the same local loopback test as the other (data communications) FSIP interfaces. Loopback functions enable you to check the integrity of the physical data path between the FSIP and the E1 port adapter with the loopback command. The no loopback command disables all loopback tests on the interface.

Figure 25 shows the path of the loopback function.

Replacing Port Adapter Cables and Changing Interface Modes

The port adapter cable connected to each port determines the electrical interface type and mode of the port. The default mode of the ports is DCE, which allows you to perform a loopback test on any port without having to attach a port adapter cable. Although DCE is the default, there is no default clock rate set on the interfaces. When there is no cable attached to a port, the software actually identifies the port as Universal, Cable Unattached rather than either a DTE or DCE interface.

Following is an example of the show controller cxbus command, which shows the first serial port on an FSIP in interface processor slot 0 (0/0) that has an EIA/TIA-232 DTE cable attached, and a second serial port (0/1) with no cable attached:

Router# show controller cxbus

 
(additional displayed text omitted from this example)
 
FSIP 0, hardware version 3, microcode version 1.0
Interface 16- Serial0/0, electrical interface is RS-232 DTE
31 buffer RX queue threshold, 101 buffer TX queue limit, buffer size 1520
    Transmitter delay is 0 microseconds
 
Interface 17- Serial0/1, electrical interface is Universal (cable unattached)
31 buffer RX queue threshold, 101 buffer TX queue limit, buffer size 1520
 
(additional displayed text omitted from this example)
 

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# int serial 0/1

Router(config-if)# shutdown

Ctrl-Z

 
Router# copy running-config startup-config

 

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# int serial 0/1

Router(config-if)# no shutdown

Router(config-if)# ^Z

 

These steps prompt the system to poll the interface and recognize the new interface immediately.

When you configure a port for a DCE interface for the first time, or when you set up a loopback test, you must set the clock rate for the port. When you connect a DCE cable to a port, the interface will remain down, the clock LEDs will remain off, and the interface will not function until you set a clock rate (regardless of the DCE mode default).

For additional descriptions of software configuration commands, refer to the appropriate publications listed in the section "If You Need More Information" on page 2.

Using Show Commands to Check the Configuration

The following summary describes how to use the show commands to verify that the new interfaces are configured correctly:

If an interface is down and you configured it as up, or if the displays indicate that the hardware is not functioning properly, ensure that the network interface is properly connected and terminated. If you still have problems, contact a service representative for assistance.

This completes the FSIP configuration procedure.

Cisco Information Online

Cisco Connection Online (CCO) is Cisco Systems' primary, real-time support channel. Maintenance customers and partners can self-register on CCO to obtain additional information and services.

Available 24 hours a day, 7 days a week, CCO provides a wealth of standard and value-added services to Cisco's customers and business partners. CCO services include product information, product documentation, software updates, release notes, technical tips, the Bug Navigator, configuration notes, brochures, descriptions of service offerings, and download access to public and authorized files.

CCO serves a wide variety of users through two interfaces that are updated and enhanced simultaneously: a character-based version and a multimedia version that resides on the World Wide Web (WWW). The character-based CCO supports Zmodem, Kermit, Xmodem, FTP, and Internet e-mail, and it is excellent for quick access to information over lower bandwidths. The WWW version of CCO provides richly formatted documents with photographs, figures, graphics, and video, as well as hyperlinks to related information.

You can access CCO in the following ways:

• WWW:  http://www.cisco.com
  
  
• WWW:  http://www-europe.cisco.com
  
  
• WWW:  http://www-china.cisco.com
  
  
• Telnet:  cco.cisco.com
  
  
• Modem:  From North America, 408 526-8070; from Europe, 33 1 64 46 40 82. Use the following terminal settings: VT100 emulation; databits: 8; parity: none; stop bits: 1; and connection rates up to 28.8 kbps.
  
  

For a copy of CCO's Frequently Asked Questions (FAQ), contact cco-help@cisco.com. For additional information, contact cco-team@cisco.com.

Posted: Mon Oct 14 13:40:08 PDT 2002
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