Connecting the T640 Router to an External Clocking Device
To connect the router to one or two external clocking devices, connect a cable with RJ-48
connectors to one of the EXTERNAL CLOCK INPUTS ports on the SCG.
1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to one of the ESD points on the chassis.
2. Plug one end of the cable into the appropriate EXTERNAL CLOCK INPUTS port on the
SCG.
3. Plug the other end of the cable into the T1 external clocking device.
4. Repeat the procedure for the other EXTERNAL CLOCK INPUTS port on the SCG.
5. Verify that the LINK LED for each port is lit steadily green.
6. Configure the port. See the synchronization statement for M Series and T Series in the
.
7. Issue the show chassis synchronization command to check the status of the port.
user@host> show chassis synchronization
user@host> show chassis synchronization
Clock Synchronization Status :
Clock module on SCG 0
Current state : master
Current clock state : locked to external-a
Selected for : 2 hours, 28 minutes, 4 seconds
Selected since : 2006-02-17 01:12:58 PST
Configured sources
Source Priority Deviation Last deviation Status
(in ppm) (in ppm)
external-a primary measuring -0.10 in-use
external-b secondary -0.10 -0.10 qualified
Clock Synchronization Status :
Clock module on SCG 1
Current state : backup
Current clock state : locked to master SCG
Selected for : 19 hours, 49 minutes, 14 seconds
Selected since : 2006-02-16 07:51:48 PST
Configured sources
Source Priority Deviation Last deviation Status
(in ppm) (in ppm)
external-a primary -0.25 -0.25 qualified
external-b secondary -0.25 -0.25 qualified
Related
Documentation
T640 SONET Clock Generators (SCGs) Description on page 27•
• T640 SONET Clock Generators (SCGs) LEDs on page 28
215Copyright © 2017, Juniper Networks, Inc.
Chapter 21: Connecting the T640 to External Devices
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