Juniper JUNOSE 11.1.X - COMMAND REFERENCE N TO Z 4-6-2010 Command Reference Manual page 1295

t1 clock source
t1 channel clock source { line | internal { module | chassis } }
Syntax
no t1 channel clock source
Command introduced before JUNOSe Release 7.1.0.
Release Information
Determines which end of the T1 interface provides clocking. The no version uses
Description
the default value, line.
Options
Controller Configuration
Mode
channel One or more individual T1 channels, ranges of T1 channels, or
combination of individual channels and ranges, in the range 1–28 (no spaces);
for example, 3,7-15,19-13,27
line Interface transmits data from a clock recovered from the line's receive
data stream
internal Interface transmits data using its internal clock. You must specify one
of the following for internal clocking:
module Internal clock is from the line module itself
chassis Internal clock is from the configured system clock
Chapter 8: T Commands
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t1 clock source