ELSA MicroLink 33.6TS User manual

MicroLink 33.6TS
User's Manual
Data Communications
Computer Graphics

Copyright ©1997 ELSA GmbH, Aachen (Germany)
All the information contained in this manual has been carefully checked. It does not, however, provide
any assurances about specific product features. ELSA assumes liability only in the scope covered in
its General Terms and Conditions.
No part of this manual or the software supplied with the product may be reproduced or passed on in
any form without the written permission of ELSA. ELSA reserves the right to make appropriate
changes to any of its products at any time.
ELSA GmbH is a DIN EN ISO 9001 certified company. With the certificate of May 16, 1995, the
authorized certification institute TÜV CERT has confirmed the conformity of ELSA GmbH with the
worldwide quality standard DIN EN ISO 9001. The certificate number of ELSA GmbH is 09 100 5069.
Trademarks
ELSA MicroLink is a registered trademark of ELSA.
IBM is a registered trademark of International Business Machines.
MNP is a registered trademark of Microcom.
All other brand and product names are trademarks of their respective owners.
Aachen, March 1997
Art. No. 20618/0397

Contents
MicroLink 33.6TS Manual © 1996 ELSA GmbH 3
Contents
1 Introduction..................................................................................................................................5
2 Brief Description.........................................................................................................................7
2.1 CE Approval....................................................................................................................................9
3 National Regulations...............................................................................................................11
3.1 BABT Approval (United Kingdom)................................................................................................11
3.2 HDTP Approval (the Netherlands)................................................................................................13
3.2.1 Voor Uw Veiligheid..................................................................................................................13
3.3 Consumer Information and FCC Requirements (USA)..................................................................14
4 Setting up the Modem..............................................................................................................17
4.1 For Your Safety.............................................................................................................................17
4.2 Setting up MicroLink 33.6TS........................................................................................................18
4.2.1 Connection...............................................................................................................................19
4.3 Installation under Windows 95....................................................................................................21
4.4 Establishing a Connection............................................................................................................22
5 Operation....................................................................................................................................23
5.1 General Information.....................................................................................................................23
5.2 The Escape Command..................................................................................................................24
5.3 The AT Command Prefix...............................................................................................................25
5.4 The Command Line Buffer............................................................................................................26
5.5 Thematic summary of modem commands and registers.............................................................27
5.6 Description of AT Commands.......................................................................................................28
5.7 Registers.......................................................................................................................................58
5.8 Using the Speakerphone..............................................................................................................77
5.8.1 Room Monitoring.....................................................................................................................78
5.9 The MicroLink 33.6TS Voice Function..........................................................................................79
Appendix....................................................................................................................................80
A Result Codes.................................................................................................................................80
B Fax Operation...............................................................................................................................81
C Error Correction............................................................................................................................82
D Technical Specifications..............................................................................................................83
E The RS-232C Interface.................................................................................................................85
F Answers to Frequently Asked Questions.....................................................................................86
G Product Support............................................................................................................................89
H Warranty Conditions....................................................................................................................93
I Glossary........................................................................................................................................95
J Index...........................................................................................................................................101
British Telecom Application Form.......................................................................................105

Introduction
MicroLink 33.6TS Manual © 1996 ELSA GmbH 5
1 Introduction
About this manual This manual describes the installation, the features and the operation of the
ELSA high-speed modem
MicroLink 33.6TS
Symbols and
conventions For faster orientation, symbols and icons are used next to sections of text which are of special interest:
◊NOTE◊denotes important information.
A bullet symbol indicates a list of items:
n...
Procedures consist of numbered steps:
1. ...
Bold text denotes the default values for AT commands and S registers.
Brackets (< >) indicate ASCII characters and characters on a keyboard. For
example, <CR> means carriage return and <BS> means backspace.
Changes to this
manual ELSA MicroLink®modems are subject to continual further development. It is
therefore possible that the printed documentation does not correspond to the
latest release. However, you will always find the latest information on the
Web server http://www.elsa.de or in the ELSA ONLINE Support BBS (see the
appendix "Product Support" for phone numbers).
Package contents Before you start installing your ELSA MicroLink®modem, please make sure
that your package is complete:
n ELSA MicroLink®modem
n External power supply (AC adapter)
n Telephone line connection cable
n Modem connection cable (RS-232C) with adapter 9 on 25 D-Sub
n MicroLink CD and/or software floppy disks
n Printed manuals
n Microphone
◊NOTE ◊If any parts are missing, please contact your dealer.
ELSA reserves the right to make changes to the package contents without
prior notice.

Introduction
6MicroLink 33.6TS Manual © 1996 ELSA GmbH
Notes:

Brief Description
MicroLink 33.6TS Manual © 1996 ELSA GmbH 7
2 Brief Description
Design MicroLink 33.6TS is a desktop modem in a flat, robust metal housing.
Transmission types MicroLink 33.6TS supports the following transmission types and bit rates:
Bell 103 300 bps duplex (not in the United Kingdom)
V.21 300 bps duplex
Bell 212A 1200 bps duplex (not in the United Kingdom)
V.22bis 1200 bps duplex
2400 bps duplex
V.23 1200 bps half-duplex
75/1200 bps duplex
1200/75 bps duplex
V.32 4800 bps duplex
9600 bps duplex
V.32bis 4800 bps duplex
7200 bps duplex
9600 bps duplex
12,000 bps duplex
14,400 bps duplex
V.Fast Class 16,800 bps duplex
19,200 bps duplex
21,600 bps duplex
24,000 bps duplex
26,400 bps duplex
28,800 bps duplex
V.34 2400 bps duplex
4800 bps duplex
7200 bps duplex
9600 bps duplex
12,000 bps duplex
14,400 bps duplex
16,800 bps duplex
19,200 bps duplex
21,600 bps duplex
24,000 bps duplex
26,400 bps duplex
28,800 bps duplex
V.34 31,200 bps duplex
33,600 bps duplex

Brief Description
8MicroLink 33.6TS Manual © 1996 ELSA GmbH
Fax mode In addition to the modem modes, MicroLink 33.6TS can send and receive
faxes at rates between 14,400 and 2400 bps. The implementation of fax
command sets Class1 and Class 2 make it possible to use any standard fax
software (e.g. Delrina WINFAX) and also the E-mail functions within
Windows 95 and Windows for Workgroups.
Polling operation ELSA MicroLink modems support the fax polling mode which, together with
suitable fax software, allows the polling of fax documents and the operation
of a polling system.
Bit rate adaptation The ITU-T V.100 and ITU-T V.8 procedures are used for determining the bit
rate used by the remote modem. This means that MicroLink modems adapt
to the highest possible bit rate common to both devices. The bit rate
adaptation can be disabled.
MNP4 and V.42 The error correction protocols implemented in the MicroLink modems (MNP4
and V.42) allow 100% error-corrected data transmission even with poor
quality telephone connections. ELSA MicroLink®modems with MNP4 or V.42
can establish reliable, error-corrected connections with other similarly
equipped modems.
MNP5 and V.42bis The MicroLink 33.6TS also uses the data compression methods MNP5 and
V.42bis. Transfer rates can be doubled by using MNP5, and even quadrupled
with V.42bis. Under optimal conditions, the MicroLink 33.6TS can achieve
effective transfer rates up to 115,200 bps!
AT command set Communications between computer and MicroLink® modems take place with
the "AT command set", which has become the de-facto standard for dial
modems (see Chapter "The AT Command Prefix", page 25).
Voice function MicroLink 33.6TS is equipped with a voice function, allowing you to use your
modem as an answering machine in connection with the supplied voice
software (see section 5.9, page 78).
Speakerphone
operation The Speakerphone feature of the MicroLink 33.6TS makes it possible to
telephone using a microphone and loudspeakers connected to the modem.
Password protection The password protection serves to protect your modem from being used or
configured by unauthorized persons. By means of a password (the so-called
supervisor password) certain modem functions can be locked. Up to five
access flags can be used to define which functions are locked.
Automatic callback This feature can be used to make your modem call back automatically if it is
called by another modem. Up to 19 callback numbers with corresponding
passwords can be stored using the AT$P command.
Remote configuration The remote configuration allows you to configure your modem from any
location you can call from. This feature can be used directly or in
combination with the automatic callback function. Up to 19 different user
passwords can be stored using the AT$P command.

Brief Description
MicroLink 33.6TS Manual © 1996 ELSA GmbH 9
2.1 CE Approval
The CE seal indicates the compliance with rules laid down by the European
Community on April 29, 1991 for the alignment and mutual recognition of the
member states' laws concerning telecommunications devices.
The modem described in this document is marked with the Celogo and thus
guarantees:
n Immunity to interference according to EN 50082,
Electromagnetic compatibility; Generic immunity standard; Part 1:
Residential, commercial and light industry
n Low radio emission according to EN 55022,
Electromagnetic compatibility of information technology and
telecommunications equipment
n Electrical safety according to EN 60950,
Safety of information technology equipment including electrical
business equipment

Brief Description
10 MicroLink 33.6TS Manual © 1996 ELSA GmbH
Notes

National Regulations
MicroLink 33.6TS Manual © 1996 ELSA GmbH 11
3 National Regulations
National regulations This chapter contains information concerning national regulations for different
countries. Please read the section on your country carefully! Slight
differences in command parameters, register values etc. are indicated in their
respective chapters later in this manual, and are not covered here. The
following countries are considered here:
United Kingdom
The Netherlands
USA
National Information
Sheet If your country is not listed here, you will find a National Information Sheet included with this manual containing all necessary information for your
country.
3.1 BABT Approval (United Kingdom)
This section applies only to the BABT approved British versions of the ELSA MicroLink ®33.6TS
modem.
This apparatus has been approved by the BABT for the use of the following facilities:
n Modem facility
n Fax facility
n Auto calling
n Auto Answer
n Hands-free telephone facility
◊ATTENTION◊Any other usage will invalidate the approval of the apparatus if as a
result it then ceases to comply with the standards against which
approval was gained.
In addition, as the owner and/or operator of this apparatus you should regard the following points:
n If you want to connect your modem to the British Telecom PSTN, you are required to fill in the
form found on the last page of this manual and send it to your local BT agency in order to have
the appropriate connection socket installed. Please don't forget to enter the approval Number of
your modem. You will find the Approval Number printed on the label placed on the modem
housing.
n The modem can only be connected to direct exchange lines. It cannot be operated in shared
service or 1 + 1 carrier systems. Further, the modem cannot be used as an extension to a
payphone.

National Regulations
12 MicroLink 33.6TS Manual © 1996 ELSA GmbH
n This modem has a Ringer Equivalence Number (REN) of 1, which is the same as the REN of a
standard BT telephone. The REN is used to determine how many devices can be connected to
your telephone line. The sum of the RENs of all devices on any line must not exceed four (4.0).
Attaching too many devices may mean that they do not ring properly. The REN of your modem
can also be found on the label placed on the modem housing.
n Before operating the modem, make sure that it is properly connected to the power supply and
switched on. Refer to chapter 4"Setting up the Modem" for installation instructions.
n The telephone line the modem is connected to must provide loop disconnect signaling (pulse
dialing) or DTMF signaling (tone dialing). The modem supports both dialing methods. Selecting
the appropriate method is described in section 5.6 of this manual, "Description of AT
Commands".
◊NOTE◊Although this equipment can use either loop disconnect signaling (pulse dialing) or
DTMF signaling (tone dialing), only the performance of the DTMF signaling is subject
to regulatory requirements for correct operation. It is therefore strongly
recommended that the equipment is set to use DTMF signaling for access to public
or private emergency services. DTMF signaling also provides a faster dialing
process.
n Within private branch exchange (PABX), dialling an external number may require the user to
insert a PSTN access digit, e.g. a digit 9 (external access code). See section 5.6 of this manual
for details about connection establishment.
n This modem is capable of storing several phone numbers which can be dialed automatically.
Check that all stored numbers are correctly programmed before using the auto-dialing function.
◊NOTE◊The V.24/RS-232C interface on the rear side of the modem housing is a connector to
a SELV circuit (Safety Extra-Low Voltage), complying with EN 41003 Clause 4.1.3.
Any part of this connector can be touched without the risk of electric shock.

National Regulations
MicroLink 33.6TS Manual © 1996 ELSA GmbH 13
3.2 HDTP Approval (the Netherlands)
This section applies only to the Netherlands versions of the ELSA MicroLink ®33.6TS modem approved
by the Hoofddirectie Telecommunicatie en Post (HDTP). This modem model may not yet be HDTP
approved at this time.
n The Connection Factor (aansluitfactor), which can be found on the HDTP approval label on the
housing of your modem, provides a guide as to the maximum number of pieces of equipment
(both in the idle state and for call detection) that can be connected in parallel to a single
telephone line. The sum of the connection factors for all the devices connected to the telephone
line must be less than five (5.0).
n Some telephone exchanges in the Netherlands still provide a dial tone in the frequency range
between 100 and 200 Hz which will not be recognized by MicroLink 33.6TS. It is therefore
possible that the modem will not function properly at all public telephone exchanges. Dial tones
in the frequency range between 340 and 550 Hz are properly recognized. Information concerning
the different types of exchanges can be obtained from the PTT-Netwerkbedrijf.
3.2.1 Voor Uw Veiligheid
Met betrekking tot uw veiligheid, het goede functioneren van uw nieuwe ELSA MicroLink ®modem en
uw computer, dient u de volgende regels in acht te nemen.
nOm kontakt met gevaarlijke spanning van de telefoonlijn en/of schade aan het modem te ver-
mijden, dient het telefoonsnoer en de voedingskabel van het modem te worden verwijderd voor-
dat u de behuizing van het modem opent. Normaliter dient de modem behuizing overigens niet
geopend te worden.
nEen telefoon verbinding maakt gebruik van gelijk- en wisselstromen om bel-signalen te kunnen
genereren. Het telefoonlijn circuit (TNV) kan onder gevaarlijke spanning staan. Elk lichamelijk
kontakt dient hiermee te worden vermeden.
nOm veiligheidsredenen dient uitsluitend de originele externe voeding, welke bij uw modem
wordt geleverd, te worden gebruikt. Een geopende voeding of een mechanisch beschadigde
voeding mag niet langer gebruikt worden want als de primaire wisselspanning (230 volt) met de
hand of metalen delen wordt aangeraakt kan dit leiden tot een electrische schok welke dodelijk
kan zijn.
nDe V.24/RS-232C verbinding op de achterzijde van uw ELSA MicroLink®modem, is de verbinding
met een z.g. VELV circuit (Veligheids Extra Lage Spanning) welke overeenkomt met de norm EN
41003, clausule 4.1.3. Elk gedeelte van deze connector kan worden aangeraakt zonder risico van
een electrische schok.
nRaak de pennen van de modem connector niet aan, want de kleinste hoeveelheid vuil of
electrostatische ontlading, kan leiden tot slecht functioneren of zelfs defect raken van uw
modem.

National Regulations
14 MicroLink 33.6TS Manual © 1996 ELSA GmbH
3.3 Consumer Information and FCC Requirements
(USA)
This section applies only to the US versions of the ELSA MicroLink ®33.6TS modem bearing an FCC
registration. This model may not yet be FCC approved at this time.
This equipment has been tested and found to comply with limits for a Class B computing device
according to the specifications in FCC (Federal Communications Commission) rules Part 15 and Part 68.
As an owner and/or operator of a registered modem like this modem, you must comply with these
rules:
nBefore installing your modem, you must notify your telephone company that you are going to
install an FCC registered device. When you contact them, you must provide the FCC registration
number and Ringer Equivalence Number (REN) for your modem; these numbers are found on the
FCC label on the modem housing.
nYou cannot connect your modem to a party line or to a coin telephone line.
nYou must only connect your modem to a standard modular telephone jack, type RJ11.
nIf your modem needs repairs, you must arrange for ELSA to make them if you are to keep the FCC
registration of your modem valid.
nYou must use a shielded RS-232C cable to connect your external modem to your terminal or
computer.
This equipment, like other electronic equipment, generates and uses radio frequency energy. If not
installed and used according to the instructions in this manual, this equipment may cause interference
with your radio and television reception.
If you believe that this equipment is causing interference with your radio or television reception, try
turning the equipment off and on. If the interference problems stop when the equipment is switched
off, then the equipment is probably causing the interference. You may be able to correct the problem
by doing one or more of the following:
nAdjust the position of the radio or TV antenna.
nMove the modem away from the radio or TV.
nPlug the modem into a different outlet than the radio or TV uses.
nConsult the dealer or an experienced radio/TV technician for help.
If this device is malfunctioning, it may also be causing harm to the telephone network. This device
should be disconnected until the source of the problem can be determined and until repair has been
made. If this is not done, the telephone company may temporarily disconnect service.
The telephone company may make changes in its technical operations and procedures. If such
changes affect the compatibility or use of this device, the telephone company is required to give
adequate notice of the changes.
If the telephone company requests information on what equipment is connected to their lines, inform
them of:

National Regulations
MicroLink 33.6TS Manual © 1996 ELSA GmbH 15
nthe telephone number of the line that the modem is connected to,
nthe Ringer Equivalence Number (REN),
nthe USOC jack required, and
nthe FCC registration number.
The Ringer Equivalence Number (REN) is used to determine how many devices can be connected to
your telephone line. In most areas the sum of the RENs of all devices on any line should not exceed
five (5.0). If too many devices are attached, they may not ring properly.
◊ATTENTION ◊Changes or modifications not expressly approved by the party
responsible for compliance could void the user's authority to operate
the equipment.

National Regulations
16 MicroLink 33.6TS Manual © 1996 ELSA GmbH
Notes:

Setting up the Modem
MicroLink 33.6TS Manual © 1996 ELSA GmbH 17
4 Setting up the Modem
4.1 For Your Safety
In the interests of your safety and the correct operation of your new ELSA MicroLink®modem with
your computer system, please regard the guidelines listed below.
◊IMPORTANT◊See chapter 3 ("National Regulations") for specific safety
instructions!
n In order to avoid contact with hazardous voltage of the telephone line circuit or damage of the
modem, be sure that you have unplugged both the power supply and the telephone line from the
modem before opening the housing! It is not normally necessary to open your modem at all.
n A telephone line uses direct current and alternating current for ring signals. The telephone line
circuit (TNV) can have hazardous voltage and must not be touched.
n For reasons of safety, use only the original external power supply shipped with your modem.
A power supply that has been opened or mechanically damaged should no longer be operated;
touching the primary voltage (Europe: 230 V, USA: 120 V) with the hand or with metal parts
results in an electric shock which can be deadly.
n The 9 VAC power input of the modem is a low voltage circuit; touching this circuit with the hand
or with metal parts does not normally cause an electric shock.
The V.24/RS-232C interface on the rear side of the modem housing is a connector to a SELV
circuit (Safety Extra-Low Voltage), complying with EN 41003 Clause 4.1.3. Any part of this
connector can be touched without the risk of electric shock.
n Please do not touch the metal pins of the modem connectors. Even slight dirt or electrostatic
discharge may cause malfunctions or, in extreme cases, damage to the modem.

Setting up the Modem
18 MicroLink 33.6TS Manual © 1996 ELSA GmbH
4.2 Setting up MicroLink 33.6TS
The following illustrations show the front and rear panels of the ELSA MicroLink 33.6TS:
Front panel of the
MicroLink 33.6TS
The LEDs provide a status display and indicate the status of the interface lines
(see also appendix "The RS-232 interface" on page 85). "Micro" indicates the
location of the microphone with which your can record messages to be used
with the voice function.
Rear panel
MicroLink 33.6TS
No. Description
1
2
3
4
5
6
7
On/Off switch
Power input
Serial port (V.24/RS-232C interface)
Port for an external active loudspeaker, a sound card or a headset
Microphone port
Line connector
Telephone connector for additional telephone

Setting up the Modem
MicroLink 33.6TS Manual © 1996 ELSA GmbH 19
4.2.1 Connection
Make sure that your computer and your modem are switched off before performing the following
steps:
The installation of your modem is performed as follows:
1. Power connection Make sure that the voltage of the power line matches the voltage of the
supplied AC adapter. Then connect the modem to the power line using the AC
adapter.
◊ATTENTION◊For your safety, use only the original power supply shipped with your modem!
2. Connection to
telephone
network
Connect your modem to the telephone network by connecting one end of the
supplied connection cable (RJ11 plug) to the line connector on the rear panel
of the modem (see illustration on page 18) and the other end to the
appropriate connection socket installed by the respective national telecom-
munications service
3. Connecting to the
computer Select the appropriate serial asynchronous communication interface (COM
port) by referring to the operating instructions of your computer or terminal
and connect the modem to this interface using the supplied RS-232C cable
and the adapter (if required).
If your computer has a 25-pin-connector you will need a 9-to-25-pin adapter,
as supplied with your ELSA modem.
It is highly recommended the serial port should be equipped with a UART chip
(Universal Asynchronous Receiver/Transmitter) with a FIFO buffer (type
16550). Without such a UART, error-free transmission across the serial
interface at rates above 9600 bps cannot be guaranteed.
When selecting the serial interface, be aware of the corresponding IRQ
settings, especially for COM3 and COM4. Make sure that each IRQ is only
used by one device only, otherwise hardware conflicts and PC malfunctions
may occur. For example, with a standard PC setup it is common for COM3 to
share IRQ4 with COM1, and for COM4 to share IRQ3 with COM2, which would
cause a conflict.
Changing an interrupt is normally performed by changing a DIP switch or a
jumper on the serial interface board. Please refer to the manual for your serial
interface board for instructions.
◊NOTE ◊If your computer only has a 9-pin connection socket, you will need an
appropriate adapter which has all nine lines connected. If some of the lines
are not connected, malfunctions (e.g. transmission errors) may arise.
4. Microphone/
active speakers For voice transmission in speakerphone operation you can
n use a telephone connected to the modem, or
n use a headset (earphone/microphone combination) with separate
microphone/headphone connectors plugged into appropriate modem

Setting up the Modem
20 MicroLink 33.6TS Manual © 1996 ELSA GmbH
sockets, or
n connect the enclosed microphone to the microphone (Mic) socket and an
amplifier (soundcard or active speakers) to the speaker (Out) socket.
5. Switch on the PC You can switch your PC on again. The hardware installation is now complete,
and you can start your communications software.
4. Switching the
modem on Switch the modem on using the switch on the rear panel of the modem. After
being switched on, the modem performs a short self-test.
5. Starting the
communications
program
You need a suitable communications software (e.g.Telix) which provides a
user interface for operating your modem.
Start your communications program and set up the COM port to which your
modem is connected. With your communications program in terminal mode,
type AT at the keyboard and press Return. If this series of characters is
echoed by the modem (i.e. displayed on the monitor) and answered with OK,
the modem is ready for operation.