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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.

Note: 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

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