Answer Posted / surjeet singh
LAPD - Link Access Protocol on D-channel, is a ISDN layer 2
protocol. It is also layer 2 protocol on BTS-BSC interface.
For more details you can refer to Q.921.
LAPDm - Link Access Protocol on Dm-channel. It is slightly
different from LAPD in the context of frame format, frame
size etc. It is layer 2 protocol between on BTS-MS interface
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