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Configuring Channelized T1/E1/ISDN PRI Interfaces for ISDN PRI Operation

On a J-series Services Router with Dual-Port Channelized T1/E1/ISDN PRI PIMs, you can configure each port for either T1, E1, or ISDN PRI service, or for a combination of ISDN PRI and either channelized T1 or E1 service. For a channelized T1 interface with ISDN PRI service, you can configure 23 B-channels and for a channelized E1 interface with ISDN PRI service, you can configure 30 B-channels.

You must also explicitly configure a D-channel: time slot 24 on a channelized T1 interface and time slot 16 on a channelized E1 interface. In addition, you select a switch type and trace options.

Setting up the router for ISDN PRI operation is a multipart process. First, you add ISDN PRI service on a channelized interface as shown here. Second, you follow the instructions in Configuring Dialer Interfaces (Required) to configure a dialer interface. You can then configure ISDN services such as dial-in, callback, and backup. For details, see Configuring ISDN.

To configure an ISDN PRI network service on a channelized T1 or E1 interface for the Services Router:

  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 41.
  3. Go on to Configuring Dialer Interfaces (Required).

Table 41: Adding an ISDN PRI Service to a Channelized T1/E1/ISDN PRI Interface

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>View and Edit>Edit Configuration.
  2. Next to Interfaces, click Edit.

From the [edit] hierarchy level, enter

edit interfaces ct1-2/0/0

Create a new interface—for example, ct1-2/0/0.

For information about interface names, see Network Interface Naming.
  1. Next to Interfaces, click Add new entry.
  2. In the Interface name box, type ct1–2/0/0.
  3. Click OK.

Configure the partition and interface type. For example, partition the interface into time slots 1 through 23 for B-channels and time slot 24 for the D-channel.

For a channelized T1 interface, you can configure 1 through 23 as B-channels and the 24th channel as the signaling channel (D-channel).

For a channelized E1 interface, you can configure 1 through 15 and 17 through 31 as B-channels and the 16th channel as the signaling channel (D-channel).
  1. In the Interface name column, click ct1–2/0/0.
  2. On the Interfaces page, next to Partition, click Add new entry.
  3. In the Partition number box, type 1–23.
  4. In the Timeslots box, type 1-23.
  5. From the Interface type list, Select bc.
  6. Click OK.
  7. On the Interfaces page, next to Partition, click Add new entry.
  8. In the Partition number box, type 24.
  9. In the Timeslots box, type 24.
  10. From the Interface type list, Select dc.
  11. Click OK.

From the [edit] hierarchy level, enter

set interfaces ct1-2/0/0 partition 1-23 timeslots 1-23

set interfaces ct1-2/0/0 partition 1-23 interface-type bc

set interfaces ct1-2/0/0 partition 24 timeslots 24

set interfaces ct1-2/0/0 partition 24 interface-type dc

Configure a trace options flag.
  1. Next to Traceoptions, select the check box and click Configure.
  2. Next to Flag, click Add new entry.
  3. From the Flag name list, select q921.
  4. Click OK until you return to the Interface page.

From the [edit] hierarchy level, enter

set interfaces ct1-2/0/0 traceoptions flag q921

Configure B-channel allocation order for allocating a free B-channel for dial-out calls. You can allocate from the lowest-numbered or highest-numbered time slot. The default value is descending.

  1. On the Interfaces page, next to Isdn options, click Configure.
  2. From the Bchannel allocation list, select ascending.
  3. Click OK.

To set the ISDN options, from the [edit] hierarchy level, enter

set interfaces ct1-2/0/0 isdn-options bchannel-allocation ascending

Select the type of ISDN switch—for example, NI2. The following switches are compatible with Services Routers:

  • ATT5E—AT&T 5ESS
  • ETSI—NET3 for the UK and Europe
  • NI2—National ISDN-2
  • NTDMS-100—Northern Telecom DMS-100
  • NTT—NTT Group switch for Japan

From the Switch type list, select ni2.

From the [edit] hierarchy level, enter

set interfaces ct1-2/0/0 isdn-options switch-type ni2

Configure Q.931 timers. Q.931 is a Layer 3 protocol for the setup and termination of connections. The default value for each timer is 10 seconds, but can be configured between 1 and 65536 seconds—for example, 15.

  1. In the T310 box, type 15.
  2. Click OK.

From the [edit] hierarchy level, enter

set isdn-options t310 15

Configure dialer options.

  • Name the dialer pool—for example, ISDN-dialer-group.
  • Set the dialer pool priority—for example, 1.

Dialer pool priority has a range from 1 to 255, with 1 designating lowest-priority interfaces and 255 designating the highest-priority interfaces.
  1. On the Interfaces page, next to Dialer options, select Yes and then click configure.
  2. Next to Pool, click Add new entry.
  3. In the Pool identifier box, type isdn-dialer-group.
  4. In the Priority box, type 1.
  5. Click OK.

From the [edit interfaces ct1-2/0/0] hierarchy level, enter

set dialer-options pool isdn-dialer-group priority 1

To configure a dialer interface, see Configuring Dialer Interfaces (Required).

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