Configuring Primary Rate Isdn - Allied Telesis AR740 Quick Start Manual

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Table Of Contents

Table of Contents

Directory numbers and subaddresses can be entered with

the command:

SET Q931=0 NUM1= number NUM2= number

SUB1= subaddress SUB2= subaddress

The directory numbers and subaddresses must be supplied by

the ISDN service provider. If the directory number is a full 10

digit number (3 digit area code plus 7 digit number), the router

will append the digits "0101" to the number and attempt SPID

initialisation with the result. This is known as the Generic SPID

procedure. If SPID initialisation has already taken place and

SPIDs have been obtained through the Auto SPID procedure,

then either these SPIDs are the same as the Generic SPID and

the router will successfully reinitialise, or the SPIDs are not the

same as the Generic SPID and the router will not initialise. In

this case, the router will revert to using the Auto SPID values.

5 Create ISDN call definitions to enable the router to make

ISDN calls to other devices on the ISDN network. This is the

only step that must be completed to configure ISDN on the

router. Before a call can be made from one router to another,

call definitions must be created on both routers, using

the command:

ADD ISDN CALL= name NUMBER= number

PRECEDENCE={IN|OUT} options...

For example, a Remote Office router is to be connected to the

Head Office router via ISDN. The ISDN number of the Remote

Office router is 1234567. The ISDN number of the Head Office

router is 9876543. The called party subaddress information

element (IE) is used to carry connection information, and PPP

interfaces will be created explicitly to use the ISDN calls. Either

router can initiate the call, but calls from the Remote Office

have precedence. On the Head Office router, create a call to

the Remote Office router:

ADD ISDN CALL=ROHO OUTSUB=LOCAL

SEARCHSUB=LOCAL NUMBER=1234567 PREC=IN

On the Remote Office router, create a call to the Head

Office router:

ADD ISDN CALL=ROHO OUTSUB=LOCAL

SEARCHSUB=LOCAL NUMBER=9876543

PREC=OUT

Each call has the same name (ROHO), and this name is passed

via the called subaddress IE to provide identification to the

remote end of the link. Each router will search for this call

using the called subaddress IE.

The precedence must be set to ensure that in the event of a

call collision (the same call being made and answered at the

A R 7 4 0 R O U T E R Q U I C K S T A R T G U I D E

same time), one call is completed and other call is cleared. The

direction of precedence is not important, but it must be set to

IN at one end of the call and OUT at the other end of the call.

The ISDN number is the exact sequence required to reach the

remote router from the local router, including STD access

codes and area codes. The number may contain only decimal

digits. Hyphens and other characters will result in an error.

Check that the ISDN calls have been successfully added with

the command:

SHOW ISDN CALL

6 Create PPP interfaces to use the ISDN calls. PPP provides

the link layer protocol and enables multiple network and

transport layer protocols such as IP and Novell

carried over the same ISDN link.

For example, on the Head Office router create PPP interface 0

to use the ISDN call ROHO:

CREATE PPP=0 OVER=ISDN-ROHO

On the Remote Office router, create PPP interface 0 to use the

ISDN call ROHO:

CREATE PPP=0 OVER=ISDN-ROHO

Check the configuration with the commands:

SHOW ISDN CALL

SHOW PPP

The call ROHO should appear in the output of the SHOW

ISDN CALL command. The output of the SHOW PPP

command should show interface ppp0 over ISDN-ROHO.

ISDN is now ready to be used by routing protocols such as IP

and IPX.