Functional Description
Table 9
Q.921 (Table 5)
Application
Format
Commands
Responses
Encoding
Octet
8
7
6
5
4
3
2
1
0
Information
Transfer
I(nformation)
N(S)
N(R)
0
4
5
4
5
4
5
P
RR
RR
0
0
0
0
0
0
0
0
0
1
0
0
1
(receive ready)
(receive ready)
N(R)
0
P/F
1
RNR
(receive not
ready)
RNR
(receive not ready)
Supervisory
N(R)
P/F
REJ
(reject)
REJ
(reject)
0
0
0
1
0
1
0
N(R)
P
1
1
0
1
0
1
1
P/F
1
4
5
4
Unacknowledged
and Multiple-
Frame
SABME
(set async.
balanced
acknowledged
Information
Transfer
Mode extd).
DM
0
0
0
0
0
0
F
P
1
0
1
0
1
1
1
1
4
4
(disconnected
mode)
UI
Unnumbered
(Unnumbered
information)
DISC
(disconnect)
0
0
1
1
0
1
P
F
0
0
0
0
1
1
1
1
4
4
UA
(unnumbered
Acknowledgement)
FRMR
(frame reject)
1
1
0
0
0
1
F
0
1
1
1
1
1
1
1
4
4
Connection
XID*
XID*
(Exch. Ident)
P/
F
Management
(Exch. Ident)
*Note: Use of the XID frame other than for parameter negotiation procedures (see § 5.4) is for
further study. The commands and responses in Q.921/table 5 are defined in § 3.6.2 to
§ 3.6.12
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