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List:       inet-access
Subject:    Re: M23 vs M13 DS3 Muxing
From:       "Scott Weeks" <surfer () mauigateway ! com>
Date:       2006-12-07 22:37:36
Message-ID: 20061207143736.5BA877B2 () resin01 ! mta ! everyone ! net
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> M23 is definitely different than M13. The 1 and 3 refer to T1 and T3. In 
> M23, it refers to T2 and T3! I don't know if anyone ever deployed T2 in 
> North America but it still exists in some places.

"M13 multiplexing is done in two steps. First, four T1 lines are bit multiplexed 
together to form a DS2 line using M12 multiplexing. These seven DS2 lines are 
then bit multiplexed together to form the DS3/T3 using M23 multiplexing."
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A great resource for DS-3 info is what used to be TTL's "Fundamentals of DS3".  You can find it here:

http://mauigateway.com/~surfer/library/fundamentals-of-DS3.pdf


I also have others.  Some are TTC's and some are Acterna's:

http://mauigateway.com/~surfer/library/fundamentals-of-SONET.pdf
http://mauigateway.com/~surfer/library/fundamentals-of-T1.pdf
http://mauigateway.com/~surfer/library/fundamentals-of-ADSL.pdf
http://mauigateway.com/~surfer/library/fundamentals-of-ethernet.pdf

































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