ERX 8.0.x Hardware Guide
Cabling the SRP I/O Module
Before powering up the router,you must set up a management console. The
console enables you tocommunicate with your system during the power-up process
and to manage yoursystem using the command-line interface (CLI).
When connecting a console directly to the SRP I/O module, usea c ableappropriate
foryourterminalconnector.ThecablemusthaveafemaleDB-9connectortoattach
to the RS-232 port on the SRP I/O module. See Figure 24 and Figure 25.
The console port is considered a data terminal equipment interface
(DTE). Direct connection toa terminal or PC (w hich also haveDTE
interfaces) requires a crossover cable.
NOTE: The alarm function on the SRP I/O module is currently not implemented.
Only ERX-7xx and ERX-14xx models haveexternal timing ports and alarm leads
located on the SRP I/O module. All ERX routers have console ports located on
the SRP I/O module. See Table 8 for details on each component.
Table 8: SRP I/O Ports
Port Description
Alarm leads (ERX-7xx and ERX-14xx models
only)
Six terminal blocks for external alarm
contacts; use a minimum 26-AWGfor each
(currentlynot implemen ted)
External timing ports (ERX-7xx and ERX-14xx
modelsonly)
Two3 -pin wire-wrap posts for US
external clocksources; primary (A)
and secondary (B)
TwoB NC connectors for E1 clock
sources;primary (A) and secondary (B)
Management consoleports One 10/100Base-TEthernet
management port with an RJ-45
connector
One RS-232 console port with a DB-9
connector forVT100 management
access
External Timing Ports
NOTE: This section applies toERX-7xx and ERX-14xx models only. The ERX-310
router does not supportexternal timing.
56 Cabling the SRP I/O Module