Troubleshooting ISDN BRI

A new ISDN circuit is being installed at a remote office. Which two troubleshooting steps should be taking when isolating a connectivity problem with a new ISDN BRI installation?

(Select two)

A. Verify that the DLCI and LMI types are correctly set

B. Verify that the correct ISDN switch type is configured

C. Determine whether or not a SPID is needed

D. Check the connection between the S/T and the NT-1

why not C?

All Basic Rate ISDN lines require a SPID in order to interoperate with the Telco Switch.

No SPIDee, no workee.

Since BRI ISDN can't work without a SPID, there is *no* possibility of it *not* being required which eliminates that answer.

John

Not all...

"**Some** service providers use service profile identifiers (SPIDs) to define the services subscribed to by the Integrated Services Digital Network (ISDN) device that is accessing the ISDN service provider."

"Currently, only the DMS-100 and NI-1 switch types require SPIDs. The AT&T 5ESS switch type may support a SPID, but you should contact your provider for information on what the SPID must be configured as. Remember that SPIDs are only required in North America and are configured only if required by your telco/provider."

H>

USA only?

The others use dlcis..LOL--anyone who has been around knows that ALL North American Telcos use SPIDS for isdn service

While used in the vast majority of installations, the use of SPIDs is a switch provisioning issue, and is not mandatory in all cases.

>

SPIDs are a North American issue, and not related to European ISDN.

Isdn is widespread in Europe, especially Germany/France. There are no spids used there.