Juniper Networks E-Series - Manual (Page 35)

E-Series Modules
E-Series Routers
1-13
Caution: Do not remove the SRP module while the system is running.
For details about installing SRP modules, see Chapter 5, Installing
Modules .
SRP Module Redundancy
SRP module redundancy is available only for ERX-7xx/14xx models. See
Redundancy Features , later in this chapter, for more information.
Nonvolatile Storage
The PCMCIA slot on the front of the SRP module holds a Type II
PCMCIA nonvolatile storage (NVS) card (see
Figure 1-12 and
Figure 1-13 ). This card is loaded with the system’s software and
configuration files. The PCMCIA card is factory installed.
SRP I/O Module
The SRP I/O module is a single corresponding input/output module that
interfaces with the SRP module(s) through the system’s midplane. The
same SRP I/O module works with all SRP modules, but is router specific.
The I/O module used in ERX-7xx/14x models cannot be used in the
ERX-310 router, and vice versa. See
Figure 1-5 , Figure 1-7 , and
Figure 1-9 for locations.
Module Details
The SRP module provides standard craft management interfaces,
including:
• 10/100Base-T – Enables access to the E-series router for Ethernet
management functions via CLI or SNMP, for example.
• RS-232 – Provides a serial connection for monitoring the system’s
hardware configuration through a PC (running terminal emulation
software) or ASCII terminal. Allows direct CLI access.
• Alarm contacts – Provide for remote indication of critical, major, and
minor E-series router alarms (ERX-7xx/14xx models only; currently
not implemented)
• External timing inputs – Provide a method of ensuring that the clock
timing used by the E-series router remains synchronized with the
network’s system clock. BNC connectors and wire wraps are available
for ERX-7xx/14xx models only.