Juniper Networks E-Series manual Cabling the SRP I/O Module, Port Description

Cabling the SRP I/O Module E-Series Routers

6-5

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 6-2for details on each
	component.
Table 6-2SRP I/O ports
Port	Description
Alarm leads	Six terminal blocks for external alarm contacts; use a minimum 26-AWG for each (currently
(ERX-7xx/14xx	not implemented)
models only)
External timing ports	• Two 3-pin wire-wrap posts for US external clock sources; primary (A) and secondary (B)
(ERX-7xx/14xx	• Two BNC connectors for E1 clock sources; primary (A) and secondary (B)
models only)
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):