Juniper Networks E-Series - Manual (Page 81)

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 6-2 for details on each
component.
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):
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