Multiplexer User's Guide
Confidential / Released
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Mux_guide_v06
Page 19 of 36
30.06.2004
4.2.3 Control field
The control field contains control information to define the frame.
Frame
Type
1 2
3 4
5 6
7 8
SABM
(set asynchronous
balanced mode)
1 1
1 1
P/F
1
0 0
UA
(unnumbered
acknowledgement)
1 1
0 0
P/F
1
1 0
DM
(disconnected mode)
1 1
1 1
P/F
0
0 0
DISC
(disconnect)
1 1
0 0
P/F
0
1 0
UIH
(unnumbered information
with header check)
1 1
1 1
P/F
1
1 1
P/F: Poll/Final bit
Commands: P = 1, Responses: F = 1
For each DLCI, only one frame with P = 1 may ever be expected.
Table 5: Coding of the control field
