Network Timing Ports - Juniper E120 - RELEASE 11.1.X HARDWARE GUIDE 3-25-2010 Hardware Manual

E120 and E320 11.1.x Hardware Guide

Network Timing Ports

The SRP IOA has two input ports for external network clock sources (75-ohm E1
2.048-Mbps/T1 1.544–Mbps inputs with BNC connectors). These ports provide a way
to ensure that the router system clock remains synchronized with the network's
system clock. The primary clock is labeled A; the secondary, redundant clock, is
labeled B. See Figure 26 on page 50.
NOTE: We recommend you use shielded cables to connect the external clock sources
to the clock source input ports. Shielded cables are not required for the operation of
the system and do not need to be grounded at both ends.
Figure 26: SRP IOA
To connect the clock source input ports:
1.
2.
3.
50
Cabling the SRP IOA
Attach the BNC connector to Clock A's network timing port.
Attach the opposite end of the network timing cable to your network's clock
source A.
Repeat steps 1 and 2 for the Clock B connections.