E-series Hardware Guide
14 ! E-series 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 12 and Figure 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 5, Figure 7, and Figure 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.
For details about installing the SRP I/O module, see Chapter 5, Installing Modules.
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