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Cabling the SRP I/O Module

Before powering up the router, you must set up a management console. The console enables you to communicate with your system during the power-up process and to manage your system using the command-line interface (CLI).

When connecting a console directly to the SRP I/O module, use a cable appropriate for your terminal connector. The cable must have a female DB-9 connector to attach to the RS-232 port on the SRP I/O module. See Figure 24 and Figure 25.

The console port is considered a data terminal equipment interface (DTE). Direct connection to a terminal or PC (which also have DTE interfaces) requires a crossover cable.

The alarm function on the SRP I/O module is currently not implemented.

Only ERX-7xx and ERX-14xx models have external timing ports and alarm leads located on the SRP I/O module. All ERX routers have console ports located on the SRP I/O module. See Table 8 for details on each component.

Table 8: SRP I/O Ports

Port

Description

Alarm leads (ERX-7xx and ERX-14xx models only)

Six terminal blocks for external alarm contacts; use a minimum 26-AWG for each (currently not implemented)

External timing ports (ERX-7xx and ERX-14xx models only)

  • Two 3-pin wire-wrap posts for US external clock sources; primary (A) and secondary (B)
  • Two BNC connectors for E1 clock sources; primary (A) and secondary (B)

Management console ports

  • One 10/100Base-T Ethernet management port with an RJ-45 connector
  • One RS-232 console port with a DB-9 connector for VT100 management access

External Timing Ports

This section applies to ERX-7xx and ERX-14xx models only. The ERX-310 router does not support external timing.

The SRP I/O module has two input ports for external clock sources. These ports provide a way to ensure that the router system clock remains synchronized with the network's system clock. The primary clock is labeled A; the secondary, redundant clock is labeled B.

Use the connectors appropriate for your locale (European or North American standard):

To connect the clock source input ports:

  1. Depending on the connector type, complete one of the following tasks:
  2. Attach the opposite end of the external timing cable or wires to your network's clock source A.
  3. Repeat Steps 1 and 2 for the Clock B connections.

Management Ports

This section applies to all ERX routers.

The Console section of the SRP I/O module has two ports for management access. (See Figure 24 and Figure 25.)

See Accessing ERX Routers for more information about management access.

Connecting to the Network

To connect the router to the network:

  1. Insert an Ethernet cable (RJ-45) connector into the 10/100Base-T (RJ-45) port on the SRP I/O module until it clicks into place.
  2. Connect the other end of the cable to the appropriate Ethernet network for an out-of-band connection.

Connecting to a Console Terminal

When you connect a console directly to the router SRP I/O module, use a cable appropriate for your terminal connector. The cable must have a female DB-9 connector to attach to the RS-232 port on the SRP I/O module.

To connect the console to the SRP I/O module:

  1. Insert the female DB-9 connector into the RS-232 port, and tighten the screws.
  2. Connect the other end of the cable to your terminal's serial port (VT100/ANSI).

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