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Cabling the SRP I/O Module

Before powering up the E-series 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 6-2 and Figure 6-3.

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.



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

Only ERX-7xx/14xx models have external timing ports and alarm leads located on the SRP I/O module. All E-series routers have console ports located on the SRP I/O module. See Table 6-2 for details on each component.

Table 6-2 SRP I/O ports 
Port
Description
Alarm leads
(ERX-7xx/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/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)
Console ports
  • One 10/100Base-T Ethernet management port with an RJ-45 connector
  • One RS-232 port with a DB-9 connector for VT100 management access

External Timing Ports



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

There are two input ports on the SRP I/O module for external clock sources. These ports provide a way to ensure that the E-series 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):



Note: Use shielded cables to connect the external clock sources to the clock source input ports.


Figure 6-2 ERX-14xx model SRP I/O module

To connect the clock source input ports:

  1. Depending on the connector type, complete one of the following tasks:


Note: You can use a wire-wrap gun to attach wires to pins.

  1. Attach the opposite end of the external timing cable or wires to your network's clock source A.
  2. Repeat steps 1 and 2 for the Clock B connections.

Console Ports



Note: This section applies to all E-series routers.

There are two ports located in the Console section of the SRP I/O module (see Figure 6-2 and Figure 6-3) that allow management access.

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.


Figure 6-3 ERX-310 router SRP I/O module

See Chapter 8, Accessing E-Series Routers, for more information about management access.

Connecting to the Network

To connect the E-series 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 E-series 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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