Onno W. Purbo Onno@indo.net.id HDLC Derived Protocol Onno W. Purbo Onno@indo.net.id

Reference Ben Dewey, HDLC Derived Protocols, www.sbei.com, 2001

Data Link Layer

Basic HDLC Frame

Contoh .. LAPB – Link Access Protocol (Balanced); X.25, AX25. LAPD – Link Access Protocol (D Channel); ISDN D Channel & telco signaling MTP-2 – Data Link Signaling Layer of SS7. PPP – Point to Point Protocol.

Address & Control Field

LAPB Frame

LAPD Frame

Beberapa Field SAPI – Service Access Point Identifier. TEI – Terminal Endpoint Identifier. Command/Responds bit. 2 Address Field Extender (EA)

DLCI SAPI + TEI SAPI Data Link Connection Identifier (DLCI) Signaling Packet Data Manajemen

Contoh LAPD .. ITU-T Q.921 ITU-T Q.922 ITU-T Q.932 ANSI T1.601