Juniper Networks 8 Cabling the SRP I/O Module, External Timing Ports, SRP I/O Ports Description

ERX 8.0.x Hardware Guide

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	Six terminal blocks for external alarm
only)	contacts; use a minimum 26-AWG for each
	(currently not implemented)
External timing ports (ERX-7xx and ERX-14xx		Two 3-pin wire-wrap posts for US
models only)		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

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

56 Cabling the SRP I/O Module