4000 Router Series Interface Configuration Guide

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• Category-2 terminal equipment (TE2), or named non-ISDN standard terminal equipment, refers to

the user equipment incompliant with the ISDN interface provisions.

• Terminal adapter (TA) implements the adaptation function so that TE2 can access a standard ISDN

interface.

Reference points include:

• R reference point between a non-ISDN equipment and TA.

• S reference point between a user terminal and NT2.

• T reference point between NT1 and NT2.

• U reference point between NT1 and line terminal.

Prerequisites

• Verify the type of the interface provided by your telecom service provider, whether it is ISDN BRI U

or ISDN BRI S/T. Despite that ITU-T I.411 has provided an ISDN user-network interface reference

model, there are some arguments in the position of the user-network dividing point. Some nations

adopt the U interface and some adopt the S/T interface depending on their needs. Identify the

interface type provided by your service provider before making a router purchase decision.

• Request for digital service. As ISDN can provide integrated services including both digital and

voice, you must request for an ISDN line allowing digital call service so that your router can make

digital communications.

• Select the connection type, which can be a point-to-point connection or a point-to-multipoint

connection (optional). Because ISDN supports semi-permanent connection, you can use an ISDN

leased line for connecting two fixed points. To connect more than two points, you must select a

point-to-multipoint connection.

• Request for the delivery of Calling Line Identification (optional). This function can filter calling

numbers on an ISDN line to block unauthorized users from the router.

Configuration procedure

ISDN BRI interfaces are used for dialup purpose. For more information about dial-up configuration, see

Layer 2—WAN Configuration Guide.

To configure an ISDN BRI interface:

Step Command Remarks

1. Enter system view.

system-view N/A

2. Enter ISDN BRI interface view.

interface bri number N/A

3. (Optional.) Configure the

interface description.

description text

By default, the description of an

interface is interface-name

Interface, for example, Bri1/0

Interface.

4. (Optional.) Enable external

loopback on the ISDN BRI

interface.

loopback { b1 | b2 | both }

By default, external loopback is

disabled on the ISDN BRI interface.

5. Set the MTU for the BRI

interface.

mtu size The default is 1500 bytes.