These are all Layer 2 protocols. This site has some very good explanations
of the differences.
http://www.sangoma.com/tutorial.htm
LLC2 = IEEE 802.2 Logical Link Control Type 2. Used by SNA and NetBIOS on a
LAN.
Frame Format: http://www.protocols.com/pbook/lan.htm#LLC
LAPD = Access protocol on ISDN D channel. Ensures error free transmission.
Frame Format: http://www.protocols.com/pbook/isdn.htm#LAPD
HDLC = Sets the framing structure for synchronous communications and is
responsible for the error-free movement of data between network nodes.
There are two different implementations of HDLC, HDLC NRM (also known as
SDLC) and HDLC LAPB. NRM is MAster/slave. LAPB is peer-to-peer.
Frame Format: http://www.protocols.com/pbook/x25.htm#HDLC
LAPB = CCITT adaptation of HDLC. Used to carry X.25 commands and control
frames. Supports full-duplex operations and is peer-to-peer (neither end
plays the role of master on a permanent basis).
Frame Format: http://www.protocols.com/pbook/x25.htm#LAPB
SDLC = Developed by IBM. Performes the layer 2 functions of the SNA
hierarchy. SDLC is virtually identical to HDLC Normal Response Mode and was
developed to replace the Bisynchronous protocol for WAN connections between
IBM equipment. Primarily half-duplex but is capable of supporting
full-duplex. Not a peer-to-peer protocol like HDLC/LAPB, X.25, and
Frame-Relay.
Frame Format: http://www.protocols.com/pbook/sna.htm#SDLC
Nope this helps,
Karen E Young
Network Engineer
ELF Technologies, Inc
[EMAIL PROTECTED]
perez
claude-vincent To: [EMAIL PROTECTED]
<claude_vincent@ cc:
yahoo.com> Subject: HDLC, SDLC...
Sent by:
nobody@groupstud
y.com
09/05/2000 10:46
PM
Please respond
to perez
claude-vincent
Dear all,
I am a little bit confused about the difference of
framing between hdlc, sdlc, lapb, lapd, llc2.
Can someone help me?
Thank you, cvp.
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