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Hierarchy Level

Release Information

Statement introduced in Junos OS Release 8.2.


On channelized T1/E1 interfaces partitioned into channels, you can insert time slots from one port directly into the other port on the same PIM, to replace time slots coming through the Routing Engine.

To avoid slips, both ports must use the same clock source: either the router’s internal clock or an external clock on one of the interfaces. If an external clock source is required, one interface must specify clocking external and the other must specify the same clock by including the clocking external interface interface-name statement at the [edit interfaces interface-name] hierarchy level.


system—Interface sends and receives data from the Routing Engine.

interface interface-name—Interface sends and receives data from a specific interface.

Default: Data is sent and received from the Routing Engine (system).

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Related Documentation