The frame relay protocol is based on the core aspects of LAPD (Link Access Protocol
D), the link layer protocol specified by CCITT. Frame relay uses the LAPD frame to
enclose both user data and the address information used to route the frame. The
address information is known as the Data Link Connection Identifier (DLCI). The frame
relay header, which is a two-byte field within the frame, is specified for enclosing a
DLCI representing the destination of the frame. A Frame Check Sequence (FCS) is used
between the access device and the network to ensure bit integrity of the frame. Frames
with errors are discarded. Frames are recovered by reinitiating transmission.
1 Byte 2 Bytes Variable Length 2 Bytes 1 Byte
Flag Frame Header Information e.g.:
LAN protocol
HDLC/SDLC frame
X.25 packet Frame Check Sequence Flag
>>> "Bradley J. Wilson" <[EMAIL PROTECTED]> 09/30/00 01:55PM >>>
Here's a question for y'all: Is Frame Relay a Layer 1 or Layer 2 protocol, and why? ;-)
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