# path ds3 t1 clock source

#### Syntax

path pathChannel ds3 ds3Channel t1 t1Channel clock source
{ line | internal { module | chassis } }

no path pathChannel ds3 ds3Channel t1 t1Channel clock source

#### Release Information

Command introduced before JunosE Release 7.1.0.

#### Description

Configures the transmit clock source for a T1 channel on a DS3 signal. This command applies to a T1 channel on a DS3 over channelized SONET interface. The no version restores the default value, line.

#### Options

- pathChannel—Number, in the range 1–2147483648, that identifies the path
- ds3Channel—Number, in the range 1–3, that identifies the DS3 channel
- t1Channel—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

#### Mode

Controller Configuration