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