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Cabling the SRP I/O Module

ERX Edge Routers

4-7

Cabling the SRP I/O Module

The next step in cabling the system is to connect cables to your SRP I/O

module. See Figure 4-3.

Note: The alarm function on the SRP I/O module is currently not implemented.

Cable connections to your SRP I/O module are divided into two sections:

external timing ports and console ports. Table 4-2 shows the

specifications for each section.

External Timing Ports

Two external clock source input ports provide a method of ensuring that

the system’s clock timing remains synchronized with the network’s system

clock. The primary clock is labeled A; the secondary, redundant clock is

labeled B. Use the connector type appropriate for your location:

• Two 75-ohm E1 2.048-Mbps inputs with BNC connectors

• Two 100-ohm T1 inputs with three pin wire-wrap connectors. Pins are

labeled T (Tip), G (Ground), and R (Ring). We recommend using

26-AWG wire minimum.

Note: Use shielded cables to connect the external clock sources to the clock

source input ports.

Table 4-2 SRP I/O ports

Port Description

External Timing

Ports

• 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-48C

connector

• One RS-232 port with a DB-9 connector for VT100 management

access

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Juniper-networks ERX-1410 Manuel d'utilisateur Page 71