Juniper E SERIES BROADBAND SERVICES ROUTERS 11.3.X - ERX HARDWARE GUIDE REV 26-9-2010 Hardware Manual page 67

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Figure 24: SRP I/O Module for ERX14xx Models
To connect the clock source input ports:
Depending on the connector type, complete one of the following tasks:
1.
E1: Attach the BNC connector to Clock A's external timing port.
T1: Wrap the tip wire on pin marked T of Clock A's external timing port, the ground
wire on G pin, and the ring wire on R pin.
NOTE: You can use a wire-wrap gun to attach wires to pins.
Attach the opposite end of the external timing cable or wires to your network's clock
2.
source A.
Repeat Steps 1 and 2 for the Clock B connections.
3.
Chapter 5: Cabling ERX Routers
51