Connecting The T640 Router To An External Clocking Device - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide

Connecting the T640 Router to an External Clocking Device

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Documentation
140
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
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
1.
the strap to one of the ESD points on the chassis.
Plug one end of the cable into the appropriate
2.
SCG.
Plug the other end of the cable into the T1 external clocking device.
3.
Repeat the procedure for the other
4.
Verify that the LED for each port is lit steadily green.
5. LINK
Configure the port. See the
6.
.
Issue the
show chassis synchronization
7.
user@host> show chassis synchronization
user@host> show chassis synchronization
Clock Synchronization Status :
Clock module on SCG 0
Current state
Current clock state
Selected for
Selected since
Configured sources
Source
external-a
external-b
Clock Synchronization Status :
Clock module on SCG 1
Current state
Current clock state
Selected for
Selected since
Configured sources
Source
external-a
external-b
T640 SONET Clock Generators (SCGs) Description on page 48
T640 SONET Clock Generators (SCGs) LEDs on page 50
Overview of Connecting the T640 Router to External Devices on page 135
Tools and Parts Required to Connect the T640 Router to External Devices on page 136
T640 RJ-48 Connector Pinouts for the SCG EXTERNAL CLOCK INPUTS Ports on
page 450
ports on the SCG.
EXTERNAL CLOCK INPUTS
EXTERNAL CLOCK INPUTS
synchronization statement for M Series and T Series in the
command to check the status of the port.
: master
: locked to external-a
: 2 hours, 28 minutes, 4 seconds
: 2006-02-17 01:12:58 PST
Priority Deviation
(in ppm)
primary measuring
secondary -0.10
: backup
: locked to master SCG
: 19 hours, 49 minutes, 14 seconds
: 2006-02-16 07:51:48 PST
Priority Deviation
(in ppm)
primary -0.25
secondary -0.25
port on the
port on the SCG.
Last deviation Status
(in ppm)
-0.10 in-use
-0.10 qualified
Last deviation Status
(in ppm)
-0.25 qualified
-0.25 qualified
Copyright © 2013, Juniper Networks, Inc.