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.

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

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