Filter
Top Products
Chapter 10 − Modem Mode AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. MultiConnect Serial-to-Serial Adapter User Guide (S000354A) 100
Command:
%Ln Line Signal Level Report
Returns a value, which indicates the received signal level. The value returned is a direct
indication (DAA dependent) of the receive level at the MDP, not at the telephone line
connector. For example, 009 = -9 dBm, 043 = -43 dBm, and so on.
Command:
%Qn Line Signal Quality Report
Reports the line signal quality (DAA dependent). Returns the higher order byte of the EQM
value. Based on the EQM value, retrain or fallback/fall forward may be initiated if enabled by
%E1 or %E2.
Example:
AT%Q
015
Command:
%Un Select µ-Law or A-Law Codec Type (Not available in V.22bis)
Values: 0, 1
Default: Country-specific
Description This command selects µ-Law or A-Law codec type for V.90 and K56flex modulation. This
command also stores the selected setting directly to NVRAM. The default value is country
specific.
%U0 Selects µ-Law.
%U1 Selects A-Law.
Command:
+A8E V.8 and V.8bis Operation Controls (Not available in V.22bis)
Values: 1, 6
Default: 1
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).
On-Hook
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.
Off-Hook
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.
<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.
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.
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.
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.
Reporting Current or Selected Values
Command: +A8E?
Reporting Supported Range of Parameter Values
Command: +A8E=?