Askey Computer 1456VQH75A Users manual

FAX/MODEM CARD

FCC ID:H8N1456VQH75A

USER'S MANUAL

Table of Contents

i - FCC/DOC REQUIREMENTS

i.1 FCC General Information
i.2 FCC Notice
i.3 DOC Notice

1 - INTRODUCTION

2 - COMMAND REFERENCE

2.1 General Command Information

2.2 AT Commands

2.2.a Commands Preceded by &

2.2.b Commands Preceded by \

2.2.c Commands Proceeded by %

2.2.d Commands Preceded by +

2.2.e Commands Preceded by **

2.3 Dial Modifiers

2.4 Commands Not Preceded By AT

2.5 Result Codes

3 - S REGISTER REFERENCE

3.1 Register Summary

3.2 Glossary of the S Registers

4 - TESTING

4.1 Local Analog Loopback

4.2 Local Analog Loopback with Self-Test

5 - TROUBLESHOOTING GUIDE

6 - APPLICATION EXAMPLES

6.1 Dialing a Remote Modem

6.2 Dial a Stored Number

6.3 Manual Answer an Incoming Call

6.4 Auto Answer an Incoming Call

6.5 Voice to Data Switching

A - MNP 10 COMMANDS

B - CALLER ID COMMANDS

C - TECHNICAL SPECIFICATIONS

D - QUICK REFERENCE

E - GLOSSARY

F - ASCII CODE TABLE

i - FCC/DOC REQUIREMENTS
i -1 FCC General Information

The Federal Communications Commission (FCC) of the United States restricts specific uses of modems,
and places registration responsibilities on both the manufacturer and the individual user:

1. The modem may not be connected to a party line or to a coin operated telephone.

2. The modem manufacturer must make any repairs to the modem to maintain valid FCC registration.

3. Notification to the telephone company is no longer required prior to connecting registered equipment,
but upon request from the telephone company, the user shall tell the telephone company which line the
equipment is connected to as well as the registration number and ringer equivalence number of the
registered protective circuitry. FCC information is printed on a label on the bottom of the modem.

i - 2 FCC Notice

NOTE
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection. This equipment
generates, uses and can radiated radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:

-Reorient or relocate the receiving antenna.

-Increase the separation between the equipment and receiver.

-Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

-Consult the dealer or an experienced radio/TV technician for help.

Changes or modifications not expressly approved by the party responsible for compliance could void the
user‘s authority to operate the equipment.

i - 3 DOC Notice

Notice: The Canadian Department of Communications label identifies certified equipment. This
certification means that the equipment meets certain telecommunications network protective, operational
and safety requirements. The Department does not guarantee the equipment will operate to the user's
satisfaction.

Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of
the local Telecommunications Company. The equipment must also be installed using an acceptable method
of connection. In some cases, the companies inside wiring associated with a single line individual service
may be extended by means of a certified connector assembly (telephone extension cord). The customer
should be aware that compliance with the above conditions might not prevent degradation of service in
some situations.

Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated
by the supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions,
may give the telecommunications company cause to request the user to disconnect the equipment.

Users should ensure for their own protection that the electrical ground connections of the power utility,
telephone lines and internal metallic water pipe system, if present, are connected together. This precaution
may be particularly important in rural areas.

Caution: Users should not attempt to make such connections themselves, but should contact the appropriate
electric inspection authority, or electrician, as appropriate.

The Load Number (LN) assigned to each terminal device denotes the percentage or the total load to be
connected to a telephone loop which is used by the device, to prevent overloading. The termination on a
loop may consist of any combination of devices subject only to the requirement that the total of the Load
Numbers of all the devices does not exceed 100.

Note: Locate an analog telephone line. Many offices have digital telephone lines, which will not
work with a modem.

Warning: Do not connect your modem to a digital telephone line. Modems are designed for use only

with analog telephone lines; connecting to a digital telephone line may damage the modem.
Verify that the line is analog before connecting.

Fax machines use analog telephone lines. If you can't find an analog voice line, find a fax machine

and use its line.

1 - INTRODUCTION

Congratulations on your purchase of this out s t anding Fax/Data Mod em. This manual describe s how to
operate your new Fax/Data Modem.

Instructions for installing your Fax/Data Modem will be found in the Installation Manual, while the
information in this manual, deals exclusively with the operation of the modem after it is installed, such as
the command set, the internal configuration registers, troubleshooting and testing.

Features:

These Fax/Data Modems combine the features of a 56000(receive only)/33600/28800/14400/9600 bps data
modem and a 14400/9600 bps FAX modem. Your new Fax/Data Modem gives your personal computer the
ability to send and receive FAX messages over the telephone line like a standard FAX machine. Your
Fax/Data Modem also allows your PC to communicate with other personal computers, terminals or BBS's
(Bulletin Bo ard Systems) through the data mod em functions.

When used as a data modem your Fax/Data Modem uses the standard AT command set and is fully
compatible with ITU-T V.42, V.42bis, V.34 (ANNEX 12), V.32bis, V.32, V.22bis, V.23, V.22, V.21,
MNP 2-5, Bell 103, 212A, K56flex and/or V.90. When used as a Fax/Data Modem it communicates with
all ITU-T Group 3 FAX machines and is compatible with ITU-T V.27ter and V.29, V.17, T.4 and T.30.
Switching between DATA mode operation and FAX mode operation of your Fax/Data Modem is done
through its firmware, no hardware settings are required.

If you are already familiar with the use of a modem and the Hayes AT command set, this modem will be
extremely easy for you to use. Just read the installation procedures in the installation manual and you are
ready to begi n operation. If you are new to modem communications, we recommend that you read through
this manual first. If you come across terms that you don't understand, consult the glossary. Words in
boldface type are command names, commands, or default settings. Carriage returns (Enter) are noted with
<CR> or [ENTER]; this does not mean to enter these characters literally; but instead to press the Enter key.

The communication software, which should be used , depends on the ki nd of machine that you are go i ng to
communicate with. If you are going to call a FAX machine then you must use the Fax software. If the
machine that you are going to communicate with is a modem then you must use a data modem
communications software.

Note: This manual is written to be used for several models of Fax/Data Modems. Some of the
information in this manual may not apply to your fax/data modem.

All the description in this manual about Caller ID, V.90 and Fax class 2 applies only to the models
which support these functions.

2 - COMMAND REFERENCE

This chapter provides an alphabetized reference with examples for all commands for the modem. The
system of commands is depicted below in Figure 2-1.

To use these commands for dialing or configuring the modem, make sure t he communications software
package you will be using lets you operate the mod em through its internal commands. If your software
permits use of the modem's internal commands, read this chapter. If not, read your software user's manual
and ignore the rest of this manual.

2-1 General Command Information

Except for the A/ command and the +++ escape command described in Section 2.4, all commands must be
prefixed with the attention code AT. For instance, the A command (below) would be entered as: "AT
A<CR>". Without the AT prefix, the command line cannot be executed. Once entered, AT cannot be
deleted with the Backspace or Delete key.

More than one command can be placed on a single line and, if desired, separated with spaces for
readability. Once the carriage return (Enter) key is pressed, the command line is executed. A line with no
carriage return is ignored.

The modem accepts either upper or lower case characters in the command line and ignores any spaces
within or between commands. Typing errors can be corrected with the Backspace key. Exceptions are
noted in the description of specific commands.

Variables (r and x) are listed in Italics. Punctuation symbols (, ; ! @) use as dial modifiers are listed
alphabetically according to their English names at the beginning of Section 2.3. Where two commands are
separated by a slash, either command will have the same effect. For example, if the command is listed as
B0/B, issuing either B0 or B will have the same effect.

2-2 AT Commands

A Go On-line in Answer Mode

This command instruc t s the modem to go off-hook immediately and then make a handshake with the remote
modem. Handshaking is not available during leased line operation.

A is usually used to manually answer an incoming call or to switch from voice conversation to data
communication.

Bn Select Protocol to 300 bps or 1200 bps

B0/B Selects ITU-T 300 or ITU-T 1200 protocol once the command line pref i x AT has been

entered at the 300 bps or 1200 bps data rate.

B1 Selects BELL 300 or BELL 212A protocol once the comm and l i ne prefix AT has been

entered at the 300 or 1200 bps data rate. (Defaul t)

Cn Carrier Transmit Control

Controls the transmit carrier. The modem is preset to turn carrier on and off as necessary (the C1 option).
The signal is on when the modem is calling, or connected to a remote modem, and is off when it is not. The
C0 option is NOT valid.

C0 Not permitted; returns ERROR result code.
C1 Normal transmits carrier switching (preset).

D Go On-line in Originate Mode

D instructs the modem to go off-hook immediately and automatically dial the numbe r contained in the dial
string following D. The dial string may contain any of the dial modifiers contained in the following section.
The D command without a dial string is usually used to switch from voice conversation to data
communication or to call a remote modem in leased-line operation mode.

En Command Echo

E0/E Disables command echo.
E1 Enables command echo. (Default)

Hn Hang Up

H0/H Goes on-hook. (Hangs up)
H1 Goes off-hook. (ready to dial)

In Identification

I0/I Report the product code.
I1 Report the hardware checksum.
I2 Report " ERROR".
I3 Report firmware revision.
I4 Report OEM defined identifier st ri ng.
I5 Report the country code paramet er.
I6 Report modem data pum p model and internal code revision.

I7 Report the DAA code.

Ln Control Speaker Volume

L0/L Low volume.

L1 Low volume. (Default)
L2 Medium volume.

L3 High volume.

Mn Monitor Speaker On/Off

M0/M Speaker is always off.
M1 Speak er i s off while receiving carrier. (Default)
M2 Speaker is always on.
M3 Speak er di sabled while dialing or receiving carrier.

Nn Automode Enable

N0 Automode detection is disabled.

N1 Automode detecti on i s enabled. This command is equi val ent to F0. (Default)

On Return to On-Line Data Mode

O0 Enters on-line data mode without a retrain. Handling is determined by the Call

Establishment task. Generally, if a connecti on exists, this comm and connects the DTE
back to the remote modem after an escape (+++).

O1 Enters on-line data mode with a retrain before returning to on-li ne data mode.

P Set Pulse Dial as Default

Causes the modem to assume that all subsequent dial commands are pulse dials.
from the dial strings.

Q Result Code Display

Determines whether the modem sends the result codes to the DTE.

Q0 Allows the modem to send result codes to the DTE.
Q1 Prohibits the modem from sendi ng result codes to the DTE.

Sn Reading and Writing to S Registers

Sn? Reads S Registers :
Read the contents of the S register speci fied by 'n'.

Sn=x Writing to Registers:
Writes the value of x to the specified S register. All the registers will return the OK

response if x is a legal value. However some registers will not actually write the value;
these are: S1, S13-S15, S 20-S 24, and S27. (n=0-95, x=0-255)

You may omit the " P "

T Set Tone Dial as Default

Causes the modem to assume that all subsequent dial commands are tone dial.

Vn Select Word or Digit Result Codes

V0/V Displays result codes in digital format.
V1 Displays result codes in verbose format. (Default)

Wn Connect Message Control

This command controls the format of CONNECT messages. The parameter value, if valid, is written to S31
bits 2 and 3. Note that the Wn command can be overridden by register S95 bits (see S95 description).

W0 Upon connection, the modem reports only the DTE s peed (e.g., CONNECT 19200).

W1 Upon connection, the modem reports the line speed, the error correction protocol, and

W2 Upon connection, the modem reports the DCE speed (e.g., CONNE CT 14400).

Subsequent responses are disabl ed. (Default)

the DTE speed, respectivel y. S ubsequent responses are disabled.

Subsequent responses are disabl ed.

Xn Extended Result Codes

This command selects which subset of the result messages will be used by the modem to inform the DTE of
the results of commands.

Blind dialing is enabled or disabled by country parameters. If the user wishes to enforce dial tone detection,
a "W" can be placed in the dial string (see D command). Note that the information below is based upon the
default implementation of the X results table.

If the modem is in facsimile mode (+FCLASS=1 or 2), the only message sent to indicate a connection is
CONNECT without a speed indication.

X0 Disables monitoring of busy tones unless forced otherwise by country requirements;

send only OK, CONNECT, RING, NO CA RRIER, ERROR, and NO ANSW ER result
codes. Blind dialing is enabled/disabled by country parameters. If busy tone detection is
enforced and busy tone is detected, NO CA RRIER will be reported. If dial tone detection
is enforced or selected and dial tone is not detected, NO CARRIER will be reported
instead of NO DIAL TONE. The value 000b i s written to S22 bits 6, 5, and 4,
respectively.

X1 Disables monitoring of busy tones unless forced otherwise by country requirements;

X2 Disables monitoring of busy tones unless forced otherwise by country requirements;

X3 Enables monitoring of busy tones; send only OK, CONNECT,

send only OK, CONNECT, RING, NO CA RRIER, ERROR, NO ANSW ER, and
CONNECT XXXX(XXXX=rate ). Blind dialin g is enabled/disabled by country parameters.
If busy tone detection is enf orced and busy tone is detected, NO CARRIER will be
reported instead of BUSY. If dial tone detection is enforced or selected and dial tone is
not elected, NO CARRIER will be reported instead of NO DI AL TONE. The value 100b is
written to S22 bits 6, 5, and 4, respectively.

send only OK, CONNECT, RING, NO CA RRIER, ERROR, NO DIAL TONE, NO
ANSWER, and CONNE CT XXXX. If b usy tone det ection is enforced and busy tone is
detected, NO CARRIER will be reported instead of BUSY. If dial tone detection is
enforced or selected and dial tone is not det ected, NO DIAL TONE will be reported
instead of NO CARRIER. The value 101b i s written to S22 bits 6, 5, and 4, res pectively.

RING, NO CARRIER, ERROR, NO ANSWER, and CONNECT
XXXX. Bl ind dialin g is enabled/disabled by country parameters. If di al tone detection is
enforced and dial tone is not detected, NO CA RRIER will be reported. The value 110b is
written to S22 bits 6, 5, and 4, respectively.

X4 Enables monitoring of busy tones; send all mess ages. The value 111b is written to S22

bits 6, 5, and 4, respectively. (Default)

Yn Enables or Disables Long Space Disconnect

Y0/Y Disables Long Space Disconnect. (Def aul t)

Y1 Enables Long Space Disconnect.

Zn Reset

Zn, which must be placed at the end of the command line, resets the active configuration of the modem to
the stored configuration saved in nonvolatile RAM, hangs up the modem, and clears the command buffer.

Z0/Z Resets the modem and loads stored configuration 0.
Z1 Resets the modem and l oads stored configuration 1.

2.2.a Commands Preceded by &

&Cn Select DCD Options

&C0/&C Maintains an ON stat us for the Data Carrier Detect (DCD).
&C1 Uses the actual stat e of the carrier from the remote modem for DCD. (Default)

&Dn DTR Option

Determines actions taken by the modem in relation to the Data Terminal Ready (DTR) signal of the serial
port.

&D0 DTR is ignored. Allows operation with DTEs that do not provide DTR.
&D1 DTR drop is interpreted by the modem as if the escape sequence has been entered. The

&D2 DTR drop causes the modem to hang up. Auto answer is inhibited. (Default)
&D3 DTR drop causes the modem to perform a soft reset as if the Z command were

modem returns to t he command state without disconnecting.

received.

&F Fetch Factory Configuration

&F0 Recall fac t ory profile 0. (Default)
&F1 Recall factory profile 1.

&Gn Set Guard Tone

&G0 - G1 Disable guard tone. (Default)

&G2 Select 1800Hz-guard tone.

&Kn DTE/Modem Flow Control

Determines how the modem controls the flow of data between the local DTE and the modem. When the
modem terminal buffer is nearly full, the modem will either send an XOFF or drop CTS to stop the data
flow. When the buffer is nearly empty, the modem will either send an XON or raise CTS to start the data
flow.

&K0 Disable DTE/DCE flow control.

&K3 Enable RTS/CTS DTE/DCE f l ow cont rol . (Default)
&K4 Enables XON/XOFF DTE/DCE flow control.
&K5 E nabl es transparent XON/XOFF DTE/DCE flow control.

&K6 Enable RTS/CTS and XON/XOFF DTE/DCE flow control.

&Mn Communication Mode

(Same as &Q0)

&Pn Select Pulse Dialing Make/Break Ratio

&P0/&P Sets a 39/61 make/break ratio @ 10 pps - used in USA. (Default)
&P1 Sets a 33/67 make/break ratio @ 10 pps.
&P2 Sets a 39/ 61 make/break ratio @ 20 pps.
&P3 Sets a 33/ 67 make/break ratio @ 20 pps.

&Qn Asynchronous Mode Selection

This command is an extension of the &M command and is used to control the connection modes permitted.
It is used in conjunction with S36 and S48.

&Q0 Sel ect direct asynchronous operation. The val ue 000b i s written to S27 bits 3, 1, and 0

&Q5 The modem will try to negotiate an error-corrected link. The m odem can be configured

&Q6 Sel ect asynchronous operation in normal mode (speed buffering). The value 110b is

respectively.

using S36 to determine whether a failure will result in the modem returning on-hook or
will result in fallback to an asynchronous connecti on. The value 101b is written t o S 27
bits 3, 1, and 0 respecti vel y. (Default)

written to S27 bits 3, 1, and 0 res pectively.

&Sn DSR Option

Determines whether DSR operates in accordance with the EIA-232-D specification or remains ON

&S0 DSR is always ON. (Default)
&S1 DSR will become active after answer tone has been detect ed and inactive after the carrier

has been lost.

&Tn Testing and Diagnostics (See Chapter 4)

Testing commands must be initiated in command mode (at the end of the command line) with asynchronous
operation in the Direct mode, selected (&Q0) at a speed of 1200 bps or faster. A telco connection must be
established prior to loopback tests. If these conditions are not met, an ERROR result code is issued. If a
local analog loopback is initiated while the modem is connected, the modem disconnects beforeperforming
the test. A test remains active for the period of time specified in register S18. If S18 is zero, the test aborts
when the user issues the &T0 command.

&T0/&T Terminates any test currently in progress.
&T1 Initiat es a local analog loopback in accordanc e with I T U-T V.54, L3; verifies the path

between the local DTE and the local m odem.

&T8 Initiates a local analog loopback with self-test i n accordance with ITU-T V.54, L2.

&V View Configuration Profiles

&V Displays the active c onfiguration profile.

&Wn Store the Current Configuration to Nonvolatile RAM

&W0 Writes the current act i ve configuration to profile 0 in nonvolatil e RA M.
&W1 Writes the current act i ve configuration to profile 1 in nonvolatil e RA M.

&Yn Select the Default Profile

&Y0/&Y Uses profile 0 on power-up. (Def aul t)

&Y1 Uses profile 1 on power-up.

&Zn Store Telephone Numbers (n=0to3)

&Zn Store one of four dial strings (including a telephone number) of up to 45 digits in nonvolatile RAM.

For example: to store the telephone number 002852117 to RAM location 1, issue the following command:

Command:AT&Z1=002852117<CR>

2.2.b Commands Preceded by \
\An Select Maximum MNP Block Size

The modem will operate an MNP error corrected link using a maximum block size controlled by the
parameter supplied.The parameter value, if valid, is written to S40 bits 6 and 7.

\A0 64 characters.
\A1 128 characters. (Default)
\A2 192 characters.
\A3 256 characters.

Result Codes:

ERROR Otherwise.

OK n=0 to 3.

\Bn Transmit Break to Remote

In non-error correction mode, the modem will transmit a break signal to the remote modem with a length in
multiples of 100ms according to parameter specified. If a number in excess of 9 is entered, 9 is used. The
command works in conjunct i on with the \K command.

In error correction mode, the modem will signal a break through the active error correction protocol, giving
no indication of the length.

\B1-\B9 Break length in 100ms units. (Default=3)

(Non-error corrected mode only.)

Result Codes:

NO CARRIER If not connected or connec t ed i n fax modem mode.

OK If connected in data modem mode.

Note: When the modem receives a break from the remote modem, break is passed to the DTE as follows: In
non-error correction mode direct, the break

length is passed; in non-error correction mode normal and in

error correction mode, a 300 ms break is passed.

\Gn Modem to Modem Flow Control (XON/XOFF)

Enables or disables modem flow control during a Normal Mode connection. Since
Reliable Mode has its own method of flow control, the \Gn command is ignored when error correction is
selected. However, DTE-to-modem flow control remains active during reliable link.

\G0 Disable flow control. (Default)
\G1 Enable flow control.

\Kn Break Control

Determines the modem's response when a BREAK is received from the DTE or the remote modem,
according to the following conditions:

When a BREAK is received from the DTE during Normal or MNP Mode:

\K0,2,4 Modem enters Command Mode (waiting for an AT command) without sending a BREAK

\K1 Modem clears the terminal and modem buffers.
\K3 Modem does not clear the buffers.
\K5 Modem sends a BREAK to the remote modem in sequence with any transmitted data.

to the remote modem.

(Default)

When a BREAK is received from the remote modem during Normal Mode:

\K0,1 Modem clears the terminal and modem buffers.
\K2,4 Modem does not clear the buffers.

\K4,5 Modem sends a BREA K in sequence with any transmitted data.

When a BREAK is received from the DTE during Direct Mode:

\K0,2,4 Modem sends a BREAK to the remote modem.
\K1,3,5 Modem sends a BREAK to the remote modem.

\Nn Operation Mode Control

Selects the operating mode to be used during connection

\N0 S el ects Normal (speed buffering) Mode. (S ame as &Q6)
\N1 S el ects Direct (pass-through) Mode. (Same as &Q0)
\N2 S el ects Reliable Link Mode.
\N3 S el ects Auto-reliable Mode. Modem attempts to connect with error correction.
\N4 S el ect LAPM error-correction mode.
\N5 S el ect MNP error-correction mode.

\Vn Single Line Connect Message Enable

The single line connect message format can be enabled or disabled by the \Vn command as follows:

\V0 Connect messages are controlled by the com mand settings X, W, and S95.
\V1 Connect messages are displayed in the single li ne f ormat described below subject to t he

command sett i ngs V (Verbose) and Q (Quiet). In Non-Verbose mode (V0), single line
connect messages are disabled and a single numeric resul t code is generated for
CONNECT DTE.

When single line connect messages are enabled, there are no CARRIER, PROTOCOL, or COMPRESSION
messages apart from the fields described below.

The single line connect message format is:

CONNECT <DTE Speed></Modulation></Protocol></Compressi on></ Line Speed>/<Voice and
Data>

Where:

<DTE Speed= DTE speed, e.g., 57600.
Modulation= "V32" for V.32 or V.32bi s modulations.

Protocol= "NONE" for no protoc ol .

"V34" for V.34 modulations.
Note: Modulation is omit ted for all other modulations.

"ALT" for Microcom Net work Protocol.
"LAPM" for LAP-M protocol.

Compression= "CLASS5" for Microc om MNP5 compression.

"V42BIS" for V.42bi s compression.
Note: Compression is omitted if protocol is NONE.

Line Speed= Asymmetric rates are displayed as /rate:TX/rate:RX, e.g., /1200 TX/75 RX.

Symmetric rat es are displayed as a single DCE rate, e. g., 14400.

Voice and Data= Blank for Data mode only.

"SVD" for AudioSpan analog si multaneous audio/voice and data.
"DSVD" for G.729A or DigiTalk di gi tal simultaneous voice and dat a.

2.2.c Commands Preceded by %

%C Enable/Disable Data Compression

Enables or disable data compression negotiation. The modem can only perform data compression on an
error-corrected link. The parameter value, if valid, is written to S41 bits 0 and 1.

%C0 Disables data compression. Resets S46 bit 1.
%C1 Enabl es MNP 5 data compression negotiati on. Resets S46 bit 1.
%C2 Enabl es V.42 bis data compress i on. Sets S46 bit 1.
%C3 E nabl es both V.42 bis and MNP 5 data compres sion. Sets S46 bit 1. (Default)

Result Codes:

OK n=0,1,2,or 3.

ERROR Otherwise.

%En Enable/Disable Line Quality Monitor and Auto-Retrain or Fallback/Fall Forward

Control whether or not the modem will automatically monitor the line quality and request a retrain (%E1)
or fall back when quality is insufficient or fall forward when line quality is sufficient (%E2). Applies to
dial-up line only. The parameter value valid is written to S41 bits 2 and 6. If enable, the modem attempts to
retrain for a maximum of 30 seconds.

%E0 Disable line quality monitor and auto-retrain.

%E1 Enable line quality monitor and auto-retrai n.
%E2 Enable line quality monitor and fallback/fall forward. (Default)
%E3 Enable line quality monitor and auto-retrai n, but hang-up immediately when EQM reaches

hang-up threshold. (fast hang-up)

%L Report Received Signal Level

Returns a value identifying the received signal level. The possible values are:

009 -9 dBm.

010 -10 dBm.

011 -11 dBm.
043 -43 dBm.

%Q Line Signal Quality