Re: Tcp/Ip vs a store & forward network


m15368%mwvm@mitre.ARPA
Fri, 3 Apr 87 15:29:31 est


 To: CERF%A.ISI.EDU CERF at A.ISI.EDU
 From: Steve Silverman
 Subject: Layer 2 multiplexing on ISDN

 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

 Cc: TCP-IP@SRI-NIC.ARPA MITRE(MCKEE) MCKEE at MITRE



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