Siemens Multiplexer Mux_guide_v06 Manual do Utilizador descarregar pdf (Página 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

(unnumbered

acknowledgement)

1 1 0 0 P/F 1 1 0

(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

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 35 36

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