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 CCNA
 Q: encapsulation types for ISDN
 
Author  Topic   
alanux
New Member



5 Posts 		Posted - Jun 18 2001 :  02:32:44 AM  Show Profile  Reply with Quote
Q: encapsulation types for ISDN?

Does anyone know the answer to the above q? This is one of braindump questions.

thanks
123456
Junior Member



10 Posts 		Posted - Jun 18 2001 :  6:59:49 PM  Show Profile  Reply with Quote
Well, I am not 100% sure of my answer. It seems that the D channel is using LAPD for encapsulation and the B channels must rely on other encapsulation protocols, such as PPP (which is using a flavor of HDLC as encapsulation). I’ve found this explanation in a book, but I’m not quite confortable with this answer.

What are you guys saying? Any suggestion?
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Aryaan
New Member


India
2 Posts 		Posted - Jun 22 2001 :  12:32:41 PM  Show Profile    Reply with Quote
Some changes in ur statemnt,

The ISDN are 2 types
BRI -> 2 B Channels (64Kbps each) and 1 D channel (16Kbps)
PRI -> 23 B Channels (64Kbps) and 1 D Channel (64Kbps)

ALL the B channels are used to transport Data and voice
all the D channels are used for signaling and call setup

As said earlier, ISDN defaults only to HDLC encapsulation, if none other is specified.
But Normally PPP is preferred and used all over.

..Aryaan

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KSheikh
New Member


USA
5 Posts 		Posted - Jun 25 2001 :  10:17:12 AM  Show Profile  Reply with Quote
Answer to the question , encapsulation typoe for ISDN IS HDLC AND PPP.
Q: encapsulation types for ISDN?

Does anyone know the answer to the above q? This is one of braindump questions.

thanks


[/quote]

Khizer M. SheikhGo to Top of Page
alanux
New Member



5 Posts 		Posted - Jun 27 2001 :  10:45:39 AM  Show Profile  Reply with Quote
Thank you all for your insights... After a thorough reading, i would agree that the answer to this question is HDLC and PPP. None of the books tells us this.

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