High-level Data Link Control
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CLI Configuration Guide
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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
Содержание OmniAccess 700
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