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Configuring a Channelized T1/E1 Interface to Drop and Insert Time Slots

On channelized T1/E1 interfaces configured for channelized operation, you can insert channels (time slots) from one port (for example, channels carrying voice) directly into the other port on the PIM, to replace channels coming through the Routing Engine. This feature, known as drop and insert, allows you to integrate voice and data on a single T1 or E1 link by removing the DS0 time slots of one T1 or E1 port and replacing them by inserting the time slots of another T1 or E1 port. It is not necessary to use the same time slots on both interfaces, but the time slots count must be same. The channels that are not configured for the drop-and-insert feature are used for normal traffic.

You must ensure that the signaling channels (port 16 for an E1 interface and port 24 for a T1 interface) are also part of the channels that are being switched through the drop-and-insert functionality. The JUNOS software does not support switching of voice and data between ports by default.

Both ports involved in the drop-and-insert configuration must use the same clock source—either the router's internal clock or an external clock.

The following clock source settings are valid:

For more details about valid clock combinations, see Frequently Asked Questions About Channelized T1 or E1 Interface.

To configure or edit the drop-and-insert feature on a channelized T1 or E1 interface:

  1. Navigate to the top of the configuration hierarchy in either the J-Web or CLI configuration editor.
  2. Perform the configuration tasks described in Table 37.
  3. If you are finished configuring the router, commit the configuration.
  4. To verify the configuration, see Verifying Interface Configuration.

Table 37: Configuring a Channelized T1/E1 Interface to Drop and Insert Time Slots

Task

J-Web Configuration Editor

CLI Configuration Editor

Navigate to the Interfaces level in the configuration hierarchy.
  1. In the J-Web interface, select Configuration>Edit Configuration>View and Edit.
  2. Next to Interfaces, click Edit.

From the [edit] hierarchy level, enter

edit interfaces ct1-3/0/0

For information about interface names, see Network Interface Naming.

Create a new interface—for example, ct1-3/0/0.
  1. Next to Interfaces, click Add new entry.
  2. In the Interface name box, type ct1–3/0/0.
  3. Click OK.

Configure the clock source and partition on ct1-3/0/0.

Note:

While configuring the drop-and-insert feature, you must ensure that both ports on the channelized T1/E1 PIM run on the same clock.

For more details about valid clock combinations, see Frequently Asked Questions About Channelized T1 or E1 Interface.
  1. In the Interface name column, click ct1–3/0/0.
  2. On the Interfaces page, next to Clocking, select the check box and click Configure.
  3. From the Clocking choices list, select external.
  4. Click OK.
  5. On the Interfaces page, next to Partition, click Add new entry.
  6. On the Interface Partition page, type 1 in the Partition number box.
  7. From the Interface type list, Select ds.
  8. In the Timeslots box, type 1-10.
  9. Click OK twice.

From the [edit] hierarchy level, enter

set interfaces ct1-3/0/0 clocking external

set interfaces ct1-3/0/0 partition 1 timeslots 1-10

set interfaces ct1-3/0/0 partition 1 interface-type ds

Create a new interface—for example, ct1-3/0/1.
  1. On the Interfaces Configuration page, next to Interface, click Add new entry.
  2. In the Interface name box, type ct1-3/0/1.
  3. Click OK.

From the [edit] hierarchy level, enter

edit interfaces ct1-3/0/1

For information about interface names, see Network Interface Naming.

Configure the clock source and partition on ct1-3/0/1.

Note:

While configuring the drop-and-insert feature, you must ensure that both ports on the channelized T1/E1 PIM run on the same clock.

For more details about valid clock combinations, see Frequently Asked Questions About Channelized T1 or E1 Interface.
  1. On the Interfaces Configuration page, click ct1-3/0/1 in the Interface name column.
  2. Next to Clocking, select the Yes check box, and click Configure.
  3. From the Clocking choices list, select external.
  4. Next to External, click Configure.
  5. In the Interface box, type ct1-3/0/0.
  6. Click OK twice.
  7. On the Interfaces page, next to Partition, click Add new entry.
  8. On the Interface Partition page, type 1 in the Partition number box.
  9. From the Interface type list, Select ds.
  10. In the Timeslots box, type 1-10.
  11. Click OK twice

From the [edit] hierarchy level, enter

set interfaces ct1-3/0/1 clocking external interface ct1-3/0/0

set interfaces ct1-3/0/1 partition 1 timeslots 1-10

set interfaces ct1-3/0/1 partition 1 interface-type ds

Create new interfaces—for example, ds-3/0/0:1, ds-3/0/1:1 and configure drop-and-insert feature.

Note:

Both interfaces configured for the drop-and-insert feature must exist on the same PIM. For example, you can configure ds-3/0/0:1 as the data input interface for ds-3/0/1:1, but not for ds-4/0/0:1.
  1. On the Interfaces Configuration page, next to Interface, click Add new entry.
  2. In the Interface name box, type ds–3/0/0:1.
  3. Click OK.
  4. On the Interfaces Configuration page, click ds–3/0/0:1 in the Interface name column.
  5. Next to Data input, click Configure.
  6. From the Input choice list, select interface.
  7. In the Interface box, type ds-3/0/1:1.
  8. Click OK.

From the [edit] hierarchy level, enter

edit interfaces ds-3/0/0:1

For information about interface names, see Network Interface Naming.

Enter

set interfaces ds-3/0/0:1 data-input interface ds-3/0/1:1

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