High-level Data Link Control
Left running head:
Chapter name (automatic)
284
Beta
Beta
CLI Configuration Guide
Alcatel-Lucent
HDLC O
VERVIEW
Layer 2 of the OSI model is the data link layer. One of the most common layer 2
protocols is the High-level Data Link Control (HDLC) protocol. In fact, many other
layer 2 protocols are based on HDLC, particularly its framing structure.
Note:
The OA-700 supports only Cisco HDLC.
The following sections describe HDLC:
•
“HDLC Frame Structure”
•
“HDLC Frame Formats”
•
“HDLC Protocol Operation”
HDLC F
RAME
S
TRUCTURE
HDLC data units transmitted from one station to another are referred to as
"frames". The figure shown below is a graphical representation of an HDLC frame
with information field.
Figure 26: An HDLC frame with an information field
Field Name
Size (in bits)
Flag Field(F)
8 bits
Address Field(A)
8 bits
Control Field(C)
8 or 16 bits
Information Field(I)
Variable; Not used in some frames
Frame Check Sequence(FCS)
16 or 32 bits
Closing Flag Field(F)
8 bits
F
A
C
I
FCS
F
Summary of Contents for OmniAccess 700
Page 38: ...Left running head Chapter name automatic 12 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Page 176: ...Left running head Chapter name automatic 150 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Page 260: ...Left running head Chapter name automatic 234 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Page 434: ...Left running head Chapter name automatic 408 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Page 464: ...Left running head Chapter name automatic 438 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Page 638: ...Left running head Chapter name automatic 612 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Page 940: ...Left running head Chapter name automatic 914 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Page 1002: ...Left running head Chapter name automatic 976 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Page 1120: ...Left running head Chapter name automatic 2 Beta Beta CLI Configuration Guide Alcatel Lucent ...