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# path ds1|e1 clock source

#### Syntax

path pathChannel { ds1 | e1 } tributaryIdentifier clock source
{ line | internal { module | chassis } }

no path pathChannel { ds1 | e1 } tributaryIdentifier clock source

#### Release Information

Command introduced before JUNOSe Release 7.1.0.

#### Description

Configures the transmit clock source for DS1 or E1 channels over channelized SONET and SDH interfaces. The no version restores the default value.

#### Options

- pathChannel—Number, in the range 1–2147483648, that identifies the path
- tributaryIdentifier—Specifier for the tributary in the format
  pathChannel { ds1 | e1 } pathPayload/tributaryGroup/tributaryNumber
  - pathPayload—Payload number for the path; value is 1 for SONET and in the range 1–3 for SDH
  - tributaryGroup—Number, in the range 1–7, that identifies the group within the path
  - tributaryNumber—Number of the tributary within the tributary group; the value is in the range 1–4 if the tributary type is vt15 or tu11 and in the range 1–3 if the tributary type is tu12
- 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

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