question 1 - at what level of detail do you wish to learn?
For X.25, there is the CCITT specification (watch URL wrap)
http://www.itu.int/rec/recommendation.asp?type=folders&lang=e&parent=T-REC-X
.25
for ATM, there is the ATM Forum Specification
(http://www.atmforum.com)
for Frame Relay, there is the Frame Relay Forum Specification
(http://www.frforum.com/)
question 2 - have you done a search on the web for any of those topics?
Here are some sample hits from google:
X.25
http://www.cis.ohio-state.edu/~jain/cis777-99/g_4x25.htm
asynchronous transfer mode
http://cne.gmu.edu/modules/atm/Texttut.html
Frame Relay
http://www.alliancedatacom.com/frame-relay-tutorials.asp
Don't forget about digital subscriber line (DSL), too
http://www.iec.org/online/tutorials/adsl/
----- Original Message -----
From: "thinkworker"
To:
Sent: Friday, September 07, 2001 9:13 PM
Subject: Is there any good books recommanded for lower 2 layers? [7:19087]
> I am trying to learn more about the lower 2 layer tech like
> X.25, ATM, Frame Relay in more detail. Is there any good books
> recommanded? I am reading a book named "emerging communications
> technologies 2nd editon" of Uyless Black, and I think it is only an
> overview of the topics.
>
> Thanks!
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