Layer 2 muxing on ISDN


H. Craig McKee (mckee@mitre.ARPA)
Sat, 04 Apr 87 10:40:32 EST


The proposed Frame Relay service of ISDN does do layer 2 multiplexing.
In LAPD, there is a 2 byte address containing a 6 bit SAPI and a 7 bit TEI
(Terminal Equipment Identifier). These 2 fields are combined into a
13 bit DLCI (Data Link Connection Identifier) which would be handled
similarly to the LCN in X.25. It would be mapped and set in each node as a
frame progressed through the network. Then a new CRC would be calculated
and inserted.
*
* Steve



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