Avaya Configuring Frame Relay Services User Manual Page 27

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Frame Relay Overview
114058 Rev. A 2-3
Figure 2-2. Frame Relay Header, 2-Byte Format
Figure 2-2 depicts the Frame Relay header as a 2-byte structure. Frame Relay can
also format the header using 3 or 4 bytes, as shown in
Figure 2-3. Note, however,
that you must configure the Frame Relay interface on the router to use the same
header length as the switched network to which it is connected.
Figure 2-3. Frame Relay Header, 3- and 4-Byte Formats
DLCI (high order) C/R
DE
EA
F
E
C
N
DLCI (low order)
8 7 6 5 4321
B
E
C
N
Flag
Frame
Relay
Header
Information
(Data)
CRC
Flag
EA
FR0002A
DLCI (high order)
DLCI
F
E
C
N
B
E
C
N
D/C EA
DLCI (low order)
or
DL-CORE Control
C/R EA
DE EA
DLCI (high order) C/R
DLCI
(low order)
F
E
C
N
DLCI EA
D/C EA
DLCI (low order)
or
DL-CORE Control
DE
EA
B
E
C
N
EA
876 54 32 187654321
3-byte Format 4-byte Format
FR0003A
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