Network Timing Ports - Juniper E SERIES BROADBAND SERVICES ROUTERS 11.3.X - E120 AND E320 HARDWARE GUIDE REV 9-29-2010 Hardware Manual

E120 and E320 11.3.x Hardware Guide

Network Timing Ports

48
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 48.
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:
Attach the BNC connector to Clock A's network timing port.
1.
Attach the opposite end of the network timing cable to your network's clock source
2.
A.
Repeat steps 1 and 2 for the Clock B connections.
3.
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