Srp Module Redundancy; Nonvolatile Storage; Srp I/O Module; Module Details - Juniper ERX - RELEASE 11.1.X HARDWARE GUIDE 03-23-2010 Hardware Manual

ERX 11.1.x Hardware Guide
NOTE: Some SRP modules require a minimum amount of memory to be used with
JUNOSe Release 5.3.0 or a higher-numbered release. See the ERX Module Guide for
module specifications.
For details about installing SRP modules, see "Installing Modules" on page 31.

SRP Module Redundancy

SRP module redundancy is available only for ERX7xx and ERX14xx models. See
"Redundancy Features" on page 14

Nonvolatile Storage

The PCMCIA slot on the front of the SRP module holds a Type II PCMCIA nonvolatile
storage (NVS) card. (See Figure 9 on page 10 and Figure 10 on page 11.) This card
is loaded with the system's software and configuration files. The PCMCIA card is
factory installed.
CAUTION: Although you can remove PCMCIA NVS (Flash) cards from a running
router, we recommend that you do not do so. If you remove the card while data is
being written to or copied from the NVS card, data can be lost or corrupted. Therefore,
we strongly recommend that you shut down the router before removing a PCMCIA
NVS card.

SRP I/O Module

The SRP I/O module is a single corresponding input/output module that interfaces
with the SRP modules 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 ERX7xx
and ERX14xx models cannot be used in the ERX310 router, and vice versa. See
Figure 2 on page 5, Figure 4 on page 7, and Figure 6 on page 8 for locations.

Module Details

The SRP I/O module provides standard craft management interfaces, including:
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ERX Modules
10/100Base-T The port enables access to the ERX router for Ethernet
management functions via CLI or SNMP, for example.
RS-232 The port 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 The contacts provide for remote indication of critical, major,
and minor router alarms (ERX7xx and ERX14xx models only; currently not
implemented)
External timing inputs The inputs provide a method of ensuring that the clock
timing used by the router remains synchronized with the network's system clock.