Troubleshooting ISDN BRI

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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




Re: Troubleshooting ISDN BRI


For me it would be B and D

Saad Ahmed wrote:
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Re: Troubleshooting ISDN BRI


why not C?


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Re: Troubleshooting ISDN BRI


Dream Catcher wrote:
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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
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John P. Dearing
A+, Network+, Server+
To reply: Just drop "YOURPANTS" in my address! 8-)


Re: Troubleshooting ISDN BRI


Actually not all ISDN switches need spid, but the question states
connectivity problem. If you have a wrong spid or unnecessary sometimes
the bri interface will go up. Making it only a layer 2 issue. In the
other hand having the wrong isdn switch configured or a bad connection
to the NT-1 will not allow the interface go up. You can have more than
one isdn switch if you have more than 1 bri. This is one of those cisco
questions that is arguable. But cisco always ask for "what would be the
best answer" for c will not because points to layer 2 and not 1.

John P. Dearing wrote:
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Re: Troubleshooting ISDN BRI


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USA only?




Re: Troubleshooting ISDN BRI


Not all...


http://www.cisco.com/en/US/tech/tk801/tk379/technologies_tech_note09186a0080093c44.shtml

"**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."

Hope this clarifies further..

On 8/18/2005 4:45 PM,Dave wrote:

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Re: Troubleshooting ISDN BRI


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


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http://www.cisco.com/en/US/tech/tk801/tk379/technologies_tech_note09186a0080093c44.shtml
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the
it




Re: Troubleshooting ISDN BRI


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



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http://www.cisco.com/en/US/tech/tk801/tk379/technologies_tech_note09186a0080093c44.shtml
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Re: Troubleshooting ISDN BRI


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


Re: Troubleshooting ISDN BRI



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




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