Siemens Mux_guide_v06 - Manual (Page 19)

Multiplexer User's Guide
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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