Filter
Top Products
Chapter 5 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 63
V.8/V.8bis Commands
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).
This command 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. For example, if initial V.8
negotiation failed, but subsequent T.30 negotiation indicated V.8 capability,
this command may be used to initiate V.8 negotiation.
Defined Values: <v8o> Decimal number which enables/disables issuance of +A8x
indications during modem-controlled V.8 origination negotiation.
1 Enable DCE-controlled V.8 origination negotiation without
+A8x indications. (Default.)
6 Enable DCE-controlled V.8 origination negotiation with +A8x
indications.
<v8a>= Decimal number which enables/disables issuance of +A8x
indications during modem-controlled V.8 answer negotiation.
1 Enable DCE-controlled V.8 answer negotiation without +A8x
indications. (Default.)
5 Enable DCE-controlled V.8 answer negotiation with +A8x
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, the +A8I indications are
issued during the course of the V.8 session to notify the DTE when the
relevant V.8 signals are received.
Report Commands: +A8E? Reports Current or Selected Values.
Response: +A8E:
<v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>]
Example: +A8E: 1,1,00,1,0,0 For the defaults
+A8E=? Reports Supported Range of Parameter Values.
Response: +A8E: (<v8o> range),(<v8a> range),(v8cf in octets),
(<v8b> range),(<cfrange>),(<protrange>)
Example: +A8E: (1,6),(1,5),(0,21,C1),(0,1),(0),(0)