Example: Configuring Complimentary Clock Sources on Channelized Interfaces

J Series devices connected to one another must have complementary clock sources configured. In the following examples, Device R1 is connected to Devices R2 and R3. Port 0 on the channelized T1/E1/ISDN PRI PIM of R1 is connected to R2, and port 1 is connected to R3. The drop-and-insert feature is configured on R1 to insert input coming from R2 on port 0 into port 1 for transmission to R3.

Devices R1, R2, and R3 can be configured in three ways, according to whether the drop-and-insert clock source on R1 is the external clock for port 0, the external clock for port 1, or the device's internal clock:

Configuring the External Clock for Port 0 as the Clock Source

To configure the drop-and-insert interfaces on Device R1 to use the external clock for port 0:

  1. Configure Device R2.

    [edit interfaces] user@hostR2# set ct1-6/0/0 partition 1 timeslots 1-10user@hostR2# set ct1-6/0/0 partition 1 interface-type dsuser@hostR2# set ds-6/0/0:1 unit 0 family inet address 10.46.46.1/30

  2. Configure Device R3.

    [edit interfaces] user@hostR3# set ct1-3/0/0 clocking externaluser@hostR3# set ct1-3/0/0 partition 1 timeslots 1-10user@hostR3# set ct1-3/0/0 partition 1 interface-type dsuser@hostR3# set ds-3/0/0:1 unit 0 family inet address 10.46.46.2/30

  3. Configure Device R1.

    [edit interfaces] user@hostR1# set ct1-3/0/0 clocking externaluser@hostR1# set ct1-3/0/0 partition 1 timeslots 1-10 user@hostR1# set ct1-3/0/0 partition 1 interface-type dsuser@hostR1# set ds-3/0/0:1 data-input interface ds-3/0/1:1user@hostR1# set ct1-3/0/1 clocking external interface ct1-3/0/0 user@hostR1# set ct1-3/0/1 partition 1 timeslots 1-10user@hostR1# set ct1-3/0/1 partition 1 interface-type ds

Configuring the External Clock for Port 1 as the Clock Source

To configure the drop-and-insert interfaces on Device R1 to use the external clock for port 1:

  1. Configure Device R2.

    [edit interfaces] user@hostR2# set ct1-6/0/0 clocking externaluser@hostR2# set ct1-6/0/0 partition 1 timeslots 1-10user@hostR2# set ct1-6/0/0 partition 1 interface-type dsuser@hostR2# set ds-6/0/0:1 unit 0 family inet address 10.46.46.1/30

  2. Configure Device R3.

    [edit interfaces] user@hostR3# set ct1-3/0/0 partition 1 timeslots 1-10 user@hostR3# set ct1-3/0/0 partition 1 interface-type dsuser@hostR3# set ds-3/0/0:1 unit 0 family inet address 10.46.46.2/30

  3. Configure Device R1.

    [edit interfaces] user@hostR1# set ct1-3/0/0 clocking external interface ct1-3/0/1user@hostR1# set ct1-3/0/0 partition 1 timeslots 1-10user@hostR1# set ct1-3/0/0 partition 1 interface-type ds user@hostR1# set ds-3/0/0:1 data-input interface ds-3/0/1:1user@hostR1# set ct1-3/0/1 clocking externaluser@hostR1# set ct1-3/0/1 partition 1 timeslots 1-10user@hostR1# set ct1-3/0/1 partition 1 interface-type ds

Configuring the Device’s Internal Clock as the Clock Source

To configure the drop-and-insert interfaces on Device R1 to use the device's internal clock:

  1. Configure Device R2.

    [edit interfaces] user@hostR2# set ct1-6/0/0 clocking externaluser@hostR2# set ct1-6/0/0 partition 1 timeslots 1-10user@hostR2# set ct1-6/0/0 partition 1 interface-type dsuser@hostR2# set ds-6/0/0:1 unit 0 family inet address 10.46.46.1/30

  2. Configure Device R3.

    [edit interfaces] user@hostR3# set ct1-3/0/0 clocking externaluser@hostR3# set ct1-3/0/0 partition 1 timeslots 1-10user@hostR3# set ct1-3/0/0 partition 1 interface-type dsuser@hostR3# set ds-3/0/0:1 unit 0 family inet address 10.46.46.2/30

  3. Configure Device R1.

    [edit interfaces] user@hostR1# set ct1-3/0/0 clocking internaluser@hostR1# set ct1-3/0/0 partition 1 timeslots 1-10user@hostR1#set ct1-3/0/0 partition 1 interface-type dsuser@hostR1# set ds-3/0/0:1 data-input interface ds-3/0/1:1user@hostR1# set ct1-3/0/1 clocking internaluser@hostR1# set ct1-3/0/1 partition 1 timeslots 1-10user@hostR1# set ct1-3/0/1 partition 1 interface-type ds
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