Connecting A T1 Or E1 External Clocking Device To The Router - Juniper ACX2000 Hardware Manual

2. Connect the other end of the SMB coaxial cable to the 10-MHz or 1-PPS source network equipment.
NOTE: Ensure that the 10-MHz and 1-PPS sources are 50 ohms LVCMOS / LVTTL (3.3v)
compatible.

Connecting a T1 or E1 External Clocking Device to the Router

The router contains an external building-integrated timing system (BITS) timing port labeled EXT REF CLK
IN on the front panel of the router.
To connect the router to a BITS T1/E1 external clocking device:
1. Attach an electrostatic discharge (ESD) grounding trap on your bare wrist, and connect the strap to
one of the ESD points on the chassis.
2. Plug one end of the RJ-45 cable into the internal clock port on the craft interface.
3. Plug the other end of the RJ-45 cable into the T1 or E1 external clocking device.
4. Verify that the LEDs for the external clock input is lit steadily green.
5. Configure the port. See:
Initially Configuring the ACX2000 or ACX2100 Router on page 111
Configuring External Clock Synchronization for ACX Series Routers
6. Issue the show chassis synchronization command to check the status of the port.
user@host> show chassis synchronization
Clock Synchronization Status :
Clock module on CB 0
Current state
Current clock state
Selected for
Selected since
Deviation (in ppm)
Last deviation (in ppm): +0.00
Clock Synchronization Status :
Clock module on CB 1
Current state
Current clock state
: master
: internal
: 13 days, 23 hours, 15 minutes, 17 seconds
: 2012-10-29 18:28:35 EDT
: +0.00
: backup
: locked to master CB
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