Multi-Tech Systems MT5600BA-V92 Benutzerhandbuch
Chapter 4 – V.8 / V.8bis Commands
Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273G)
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Chapter 4 – V.8 / V.8bis Commands
V.8 is a way V.34 modems negotiate connections features and options, and V.8bis is a start-up sequence for
multimedia modems.
Command: +A8E V.8 and V.8bis Operation Controls
Description:
This command is defined for two conditions: as a parameter while the modem is on-hook,
and as an action command while the modem is off-hook. If enabled, V.8 negotiation does
not preclude simultaneous implementation of other negotiation means (e.g., V.8bis, V.18,
V.32bis Annex A). It is a compound parameter if issued while the modem is on-hook, used
to precondition V.8 and V.8bis originating and answering operation. It is issued by the
DTE before the Dial (D) or Answer (A) command, regardless of the state of the +FCLASS
parameter. This command is an action command if issued while the modem is off-hook to
(re)start V.8 or V.8bis negotiation.
and as an action command while the modem is off-hook. If enabled, V.8 negotiation does
not preclude simultaneous implementation of other negotiation means (e.g., V.8bis, V.18,
V.32bis Annex A). It is a compound parameter if issued while the modem is on-hook, used
to precondition V.8 and V.8bis originating and answering operation. It is issued by the
DTE before the Dial (D) or Answer (A) command, regardless of the state of the +FCLASS
parameter. This command is an action command if issued while the modem is off-hook to
(re)start V.8 or V.8bis negotiation.
Example: If initial V.8 negotiation fails, but subsequent T.30 negotiation indicates V.8
capability, this command may be used to initiate V.8 negotiation.
capability, this command may be used to initiate V.8 negotiation.
Syntax:
+A8E=<v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>]
Values:
<v8o>
Decimal number which enables/disables issuance of +A8x indications
during modem-controlled V.8 origination negotiation.
during modem-controlled V.8 origination negotiation.
1
Enable DCE-controlled V.8 origination negotiation without +A8x
indications. Default
indications. Default
6
Enable DCE-controlled V.8 origination negotiation with +A8x
indications.
indications.
<v8a>=
Decimal number which enables/disables issuance of +A8x indications
during modem-controlled V.8 answer negotiation.
during modem-controlled V.8 answer negotiation.
1
Enable DCE-controlled V.8 answer negotiation without +A8x
indications. Default
indications. Default
5
Enable DCE-controlled V.8 answer negotiation with +A8x
indications.
indications.
<v8cf>=
Set the V.8 CI signal call function to the hexadecimal octet XY
00 Default
21
C1
<v8b>=
Decimal number which enables/disables V.8bis negotiation.
0
Disable V.8bis negotiation.
1
Enable V.8bis negotiation. Default
<cfrange>=
“<string of values>“. Applicable only for <v8a>=5. Not supported.
< protrange >= <string of values>“. Applicable only for <v8a>=5. Not supported.
Default Values:
1,1,00,1,0,0
The ATD and ATA commands behave as specified in V.250, and +A8n indications are not
generated by the modem. For subparameter values <v8o>=6 and <v8a>=5, +A8I
indications are issued during the V.8session to notify the DTE when the relevant V.8
signals are received.
generated by the modem. For subparameter values <v8o>=6 and <v8a>=5, +A8I
indications are issued during the V.8session to notify the DTE when the relevant V.8
signals are received.
Report Commands:
+A8E? Reports current or selected values.
+A8E=? Reports supported range of parameter values.
Command: +A8I
CI Signal Indication
Description:
This indication is issued by an answering modem, if +A8E,<v8a> .0, to indicate detection
of a V.8 CI signal and report the recovered Call Function octet(s).
of a V.8 CI signal and report the recovered Call Function octet(s).
Indication
Syntax:
+A8I:<v8cf><CR>
Values:
<v8cf>
A hexadecimal code octet representation of those Call Function octet(s).
+A8I:0 indicates that the modem timed out waiting for CI.
Example:
+A8I:0 The modem timed out waiting for CI.
+A8I:X YYY