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Cabling ERX Routers
The SRP I/O module ha s two input ports for external clock sources.
These ports p r
ovide a way to ensure that the router system clock remains
synchronized with the network’s system clock. The prim ary clock is labe led
A; the secondary, redundant clock is la beled B.
Use the co n nectors appropriate for your locale (European or
North Americ
an standard):
European—Tw
o 75-ohm E1 2.048-Mbps inputs with BNC connectors
North Americ
an—Two 100-ohm T1 inputs w ith three pin wire-wrap
connectors. Pins are labeled T (tip), G (ground), and R (ring). We recommend
using 26-AWG wire minimum.
NOTE: Use shi
elded cables to connect the external clock sources to the clock
source input ports.
Cabling the SRP I/O Module 57