KE LOGEM LGH 28.8D1 User manual

Operation Manual
V.34 - Modems
LOGEM ®928
LOGEM ®LGM 28.8D1
LOGEM ®LGH 28.8D1
© Copyright 1997 ke Kommunikations-Elektronik GmbH & Co.
Technical Status 07/97
Changes may be made without further notice.
Editor:
ke Kommunikations-Elektronik GmbH & Co.
Kabelkamp 20
30179 Hannover/Germany
Phone: ++49 (511) 67 47 - 0
Fax: ++49 (511) 67 47 - 376
Internet: http://www.ke-online.de
T-Online: *ke #
Ordering Number: 371 977 46

Attention:
The versions: LOGEM ®928
(standalone version)
LOGEM ®LGM 628.8D1
(rackmounted version)
LOGEM ®LGH 28.8D1
(top rail version)
these versions are not specified with their product name at some parts in
the manual due to practical reasons. Specific features of the different
versions are described separately in the operation manual.
The product meets the rules of the conformity
declaration at operational conditions that can be
considered as normal use.

3Operation Manual V.34 - Modems, Version 07/97
Contents
1 Modem Description........................................... 15
2 Switches Description......................................... 33
3 AT Commands ................................................... 67
4 Register Allocation .......................................... 105
5 V.25bis Commands ......................................... 125
6 Dial Backup Features ...................................... 135
7 Applications..................................................... 145
8 Appendix ......................................................... 171
Chapter 8
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Chapter 1
Chapter 7
AT
Chapter 3
Chapter 6
ON
Chapter 2
REG
Chapter 4
V.25
bis
Chapter 5

4Operation Manual V.34 - Modems, Version 07/97
Contents
Contents
General ...............................................................................................9
Safety Instructions..................................................................................9
About The Manual ................................................................................11
1 Modem Description.................................................................15
1.1 Transmission Procedures ....................................................16
1.2 AT Commands .....................................................................17
1.3 Compatibility........................................................................17
1.4 V.25bis Commands..............................................................17
1.5 Automatic Dialing ................................................................17
1.6 Data Compression and Data Protection .............................17
1.7 Password Protection and Callback.....................................18
1.8 Remote Configuration .........................................................18
1.9 2/4 Wire Leased Line Operation with Dial Backup .............18
1.10 Fax Operation ......................................................................18
1.11 License.................................................................................18
1.12 Front Panel LOGEM ® 928 .................................................19
1.13 Backpanel LOGEM ® 928 ...................................................20
1.14 Front Panel LOGEM ® LGM 28.8D1..................................21
1.15 Side View LOGEM ® LGM 28.8D1 .....................................22
1.16 Front Panel LOGEM ® LGH 28.8D1 ...................................23
1.17 Top Side LOGEM ® LGH 28.8D1........................................24
1.18 Connection Example ...........................................................25
1.19 Installation and Commissioning
(Standalone Versions)..........................................................26
1.20 Installation and Commissioning
(Rackmounted Versions)......................................................27
1.21 Installation and Commissioning
(Top Rail Versions) ...............................................................28
1.22 Loading of Basic Settings ...................................................29
1.23 Event Report System...........................................................29
2 Switches Description ..............................................................33
2.1 Table Software/Compatible/Mixed Mode ...........................36
2.1.1 Compatible Mode Switches ................................................37
2.1.1 LGM 1200H1 Operation ......................................................38
2.1.2 LGM 2400D2 Operation ......................................................40
2.2.1 LOGEM ® 914/LGM 14.4D1 Synchronous/V.25bis............44
2.2.2 LOGEM ® 914/LGM 14.4D1 Asynchronous
(software mode/AT and V.25bis)..........................................46

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Contents
2.2.3 LOGEM ® 928/LGM 28.8D1 Synchronous V.25bis ............48
2.2.4 LOGEM ® 928/LGM 28.8D1 Asynchronous
(Software mode/AT and V.25bis) .........................................50
2.3 Software Mode Switches Description.................................52
2.3.1 Loading of Basic Settings 0, 1 or 8.....................................52
2.3.2 Basic Setting 0 ....................................................................53
2.3.3 Basic Setting 1 ....................................................................53
2.3.4 Basic Setting 8 (User Setting 2) ..........................................54
2.4 Switches Table Basic Setting 0 (Software Mode) ...............55
2.4.1 Switches Table Basic Setting 1 ...........................................56
2.4.2 Switches Table Basic Setting 8 (User Setting 2).................57
2.5 Transmit and Receive Levels (Standalone Versions) ..........58
2.6 Board of the LOGEM ® 928 (Standalone Version) ............59
2.7 Transmit and Receive level (Rackmounted Version)...........60
2.8 Board of the LGM 28.8D1 ...................................................61
2.9 Transmit And Receive Level (Top Rail Version)..................62
2.10 Board of the LGH 28.8D1....................................................63
2.11 Country Setting for LGH 28.8D1.........................................64
3 AT Commands .........................................................................67
3.1 General ................................................................................67
3.2 Command Description ........................................................68
3.3 Telephone and Dialing Features ..........................................69
3.3.1 Test Loops ...........................................................................77
3.3.2 Storing and Displaying of Telephone Numbers ..................78
3.4 Report Codes ......................................................................79
3.5 Changing of Register Contents...........................................83
3.6 Activation of Control and Report Lines...............................86
3.7 Data Protection Protocols ...................................................89
3.7 BREAK Handling..................................................................92
3.8 Handshake...........................................................................93
3.9 Module Functions................................................................95
3.10 Password Protection ...........................................................96
3.11 Remote Configuration .......................................................100
3.12 Loudspeaker......................................................................101
4 Register Allocation................................................................105
4.1 Modem Memory Locations ...............................................105
4.2 Register Description ..........................................................107

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Contents
5 V.25bis Commands ................................................................125
5.1 Reports ..............................................................................125
5.2 Dialing and Telephone Functions ......................................127
5.3 Modem Configuration with V.25bis ...................................131
5.3.1 DNL Command for LGM 1200H1 Operation ....................132
5.3.2 DNL Command for LGM 2400D2 Operation ....................132
6 Dial Backup Features............................................................135
6.1 Function of the Dial Backup Board...................................135
6.2 Installation of the DBU Board
(Standalone Version)..........................................................135
6.3 Installation of the DBU Board
(Rackmounted Version) .....................................................138
6.4 Telephone Access Line Selection .....................................139
6.5 Access Line Alternatives ...................................................141
7 Applications ...........................................................................145
7.1 Remote Configuration Features ........................................145
7.2 Leased Line Operation (Standalone Version)....................151
7.2.1 Leased Line Operation (Rackmounted Version) ...............152
7.2.2 2 Wire Leased Line ............................................................153
7.2.3 4 Wire Leased Line ............................................................156
7.2.4 Leased Line Operation with Dial Backup..........................157
7.2.5 Leased Line Operation with Manual Dial Backup.............158
7.3 Leased Line Operation ......................................................163
7.4 Lightning and Overvoltage Protection ..............................167
8 Appendix.................................................................................171
Appendix A ........................................................................171
Appendix B1
Connection to a TAE 6NF Socket .....................................174
Appendix B2
Telephone Access Jacks...................................................175
Appendix B3
Telephone Access Jacks...................................................176
Appendix B4
Telephone Access Jacks...................................................177

7Operation Manual V.34 - Modems, Version 07/97
Contents
Appendix B3
Telephone Access Cable RJ12/TAE 6N ............................178
Appendix B4
Telephone Access Cable FKS8/TAE 6N............................179
Appendix C1
Data Interface LGM 28.8D1 ..............................................180
Appendix C2
Interfaces LGM 28.8D1 .....................................................181
Appendix C3
V.24 Interface Allocations ..................................................182
Appendix C4
Asynchronous Standard Connection Connection ............183
Appendix C5
Synchronous Standard Connection ..................................184
Appendix C7
Modem to Modem Cross Cable (asynchronous) ..............185
Appendix C6
Allocation of the 25pole Sub D Jack.................................185
Appendix C8
Modem Identification.........................................................186
Appendix D
ASCII Table ........................................................................187
Appendix E
Glossary.............................................................................188
Appendix F
Technical Data ...................................................................191
Appendix G
Index ..................................................................................193

8Operation Manual V.34 - Modems, Version 07/97
Contents

9
Operation Manual V.34 - Modems, Version 07/97
General
General
Safety Instructions
Please read the following safety instructions carefully. They are ment for
your own safety and for faultless function of your devices:
• Electronical devices are sensitive for electrostatical charges.
Deflect any electrostatical charges before touching the board with
your hands or tools.
• Disable the power supply before removing the housing (standalone)
or the casing of the rackmounted versions.
• Boards may be only extracted after any connections have been
removed.
• Make sure that other units you are going to connect to your device
meet all specifications.

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General

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Operation Manual V.34 - Modems, Version 07/97
General
About The Manual
Thismanualpresents the featuresof the modems concerning all functions
and meaning of the DIP switches as well as the operational elements and
the command language.

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General

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Chapter 1
Modem Description
1 Modem Description.............................15
1.1 Transmission Procedures........................................... 16
1.2 AT Commands ........................................................... 17
1.3 Compatibility .............................................................. 17
1.4 V.25bis Commands .................................................... 17
1.5 Automatic Dialing....................................................... 17
1.6 Data Compression and Data Protection .................... 17
1.7 Password Protection and Callback............................ 18
1.8 Remote Configuration................................................ 18
1.9 2/4 Wire Leased Line Operation with Dial Backup .... 18
1.10 Fax Operation ............................................................ 18
1.11 License....................................................................... 18
1.12 Front Panel LOGEM ® 928 ........................................ 19
1.13 Backpanel LOGEM ® 928 ......................................... 20
1.14 Front Panel LOGEM ® LGM 28.8D1......................... 21
1.15 Side View LOGEM ® LGM 28.8D1 ............................ 22
1.16 Front Panel LOGEM ® LGH 28.8D1 .......................... 23
1.17 Top Side LOGEM ® LGH 28.8D1 .............................. 24
1.18 Connection Example.................................................. 25
1.19 Installation and Commissioning
(Standalone Versions) ................................................ 26
1.20 Installation and Commissioning
(Rackmounted Versions) ............................................ 27
1.21 Installation and Commissioning
(Top Rail Versions)...................................................... 28
1.22 Loading of Basic Settings.......................................... 29
1.23 Event Report System ................................................. 29

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Modem Description

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Chapter 1
1 Modem Description
TheLOGEM ®928 isahighspeedstandalone modem for duplex operation
thatsupportsallconventionalmodulationprocedures. The LOGEM®LGM
28.8D1 has identical features and comes as a rackmounted version while
the LOGEM ®LGH 28.8D1 is the version for top rail installation.
The modems support the operation modes listed below:
• V.34
• V.32bis
• V.32
• V.22bis
• V.22
• V.23dx
• V.21
• V.17, V.29, V.27ter (only for fax operation)
Data transmission is possible with synchronous or asynchronous
procedures. The modems are designed for operation on switched and
leased lines as well. Software configuration is performed using AT, V.25bis
orDNLcommands,DIPswitchesare available for hardware configuration.
As an option an additional board for 2/4 wire leased line operation with
dial backup feature is available thus providing a second line interface.
Data protection protocols acc. to V.42bis and MNP4 are implemented for
the transmission procedures acc. to ITU-T V.34, V.32bis, V.32, V.22bis
and V.21 thus allowing for almost errorless data transmission between to
terminal equipments. Due to the implementation of data compression
methods acc. to V.42bis and MNP5 data transmission rate may increase
up to the factor 4 (max. 115200 bit/s).
Safety aspects are taken into consideration starting with the dial up. At
activatedpasswordprotectionanycaller is only putthroughto the terminal
equipment (i.e.a host) after typing the correct password.
With an additional callback number a connection is terminated after the
correct password has been transfered and the modem dials the callback
number. A connection to a host is only switched when the connection
has been established succcessfully during the callback procedure.
The modems even cooperate with terminal equipment that might not be
able to transfer dial commands. The operation mode “direct call“ allows
for dialing of a predefined calling number just by switching the control
line S1/DTR from OFF to ON.
As a further feature the modems are designed for remote configuration
as direct or local modem configuration is not possible at some
applications, i.e. a terminal is not available or the operation mode of dif-
ferent remote modems has to be altered. The modems from the LOGEM
Modem Description

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product line even allow for reconfiguration during an existing connection.
Three operation modes are available for different modem applications.
During software mode all modem configurations are performed using AT
or V.25bis commands. AT commands should be prefered generally as
V.25bis commands do not allow to set any registers. The command phase
is always asynchronous during utilization of AT commands. After dial up
data transmission is performed according to the selected synchronous
or asynchronous modulation procedure.
Compatible mode is employed to emulate duplex operation mode for
existing recent modems. Here the necessary modem is selected using
the DIP switches. The first 14 switches of the modem correspond to the
switches of the modem to be replaced. For this reason a terminal is not
necessary for modem configuration.
During mixed mode the modem operates with the AT mode but some
registers have to be selected with DIP switches as they are blocked for
software access.
1.1 Transmission Procedures
The modems operate with the ITU-T recommendations listed below:
• V.34 (2400 bit/s, 4800 bit/s, 7200 bit/s, 9600 bit/s,
12000 bit/s, 14400 bit/s, 16800 bit/s, 19200 bit/s,
21600 bit/s, 24000 bit/s, 26800 bit/s, 28800 bit/s,
duplex) synchronous and asynchronous
• V.32bis (14400 bit/s and 12000 bit/s, duplex)
asynchronous and synchronous
• V.32 (4800 bit/s, 7200 bit/s und 9600 bit/s, duplex)
asynchronous and synchronous
• V.22bis (2400 bit/s, duplex) synchronous and asynchronous
• V.22 (1200 bit/s, duplex) synchronous and asynchronous
• V.23 (75/1200 bit/s, 1200/75 bit/s, asymmetricalduplex)asynchronous
• V.21 (300 bit/s, duplex) asynchronous
• V.17, V.29, V.27ter (14400 bit/s, 12000 bit/s,
9600 bit/s, 4800 bit/s, 2400 bit/s, halfduplex)
send and receive fax
Modem Description

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Chapter 1
Modem Description
1.2 AT Commands
The AT command set is an international standard developed by the US
modem manufacturer Hayes. During command mode any modem
commands or modem reports are transfered asynchronously to the data
terminal equipment (DTE).
Acommandlinehastostart with an AT.Themodemsfeature an integrated
automatical baud rate detection (up to 57600bit/s) that may be
deactivated.
1.3 Compatibility
The modems described here are functionally compatible to the duplex
operation modes of the models LGM 1200H1 and LGM 2400D2.
1.4 V.25bis Commands
The ITU-T recommendation is an international standard for automatic
dialing during synchronous or asynchronous operation modes.
1.5 Automatic Dialing
The modems come with an integrated automatical dialing feature for data
connections that may be controlled using either the V.25bis or the AT
command set. An integrated memory for calling numbers is included as
well. The dialing can be performed with pulse or tone (multi frequency)
dialing procedures.
Attention!
After data transmission the receiver must be onhook as the connection
remains operational at full charges otherwise.
1.6 Data Compression and Data Protection
To prevent from data transmission errors on low quality telephone lines
the modems can utilize the V.42 protocol or the Microcom Networking
Protocol MNP 4 during the operation modes acc. to V.32bis, V.32, V.22,
V.22bis and V.21. As an addition data compression is possible with MNP5
or V.42bis protocols.

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1.7 Password Protection and Callback
The modems provide password protection with four operation modes
thatmaybecombined freely (with/without callback andreleased callback/
forced callback). Max. 20 callback numbers are protected individually
with a password. Any alterations are protected using a super password.
A register counts wrong passwords thus providing a hacker protection.
1.8 Remote Configuration
The modems are designed for remote configuration. A connection can
besetupe.g fromaremote stationtothemodem. The remote configuration
can be initiated just by typing a special password.
1.9 2/4 Wire Leased Line Operation with Dial Backup
This feature is only available for the standalone and rackmounted
versions!
A special board for 2/4 wire leased line operation with dial backup feature
is available as an option. Max. 20 backup numbers may be stored. During
failures on the leased line the modem calls the stored backup numbers
until it is able to initiate a switched line connection. In the meantime the
modem
checks the leased line constantly and reswitches automatically if the
leased line is operational again.
1.10 Fax Operation
The fax option of the modems allows for sending and receiving faxes
with a special fax software that should be installed on your computer
(e.g.: RVS-Com for Windows, WinFax Pro 3.0). The fax option is
compatible to:
• ITU-T (CCITT) group 3 (Rec. G3)
• TIA/EIA CLASS 2
1.11 License
The modems are licensed for operation in public and private networks by
the national german licensing authorities.
Modem Description

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Chapter 1
Modem Description
1.12 Front Panel LOGEM ®928
LOGEM®
928
S1 M2 D1 M5 D2 A/O Da/Te
Element Description
S1 (LED) State of interface line S1
ON: DTE is operational
M2 (LED) State of interface line M2
ON: DCE ready to transmit
D1 (LED) State of interface line D1
OFF: no DTE connected
Green:DTE is active
Red: DTE transmits data
M5 (LED) State of interface line M5
ON: carrier detected
D2 (LED) State of interface line D2
Green:DCE is active
RED: receive data
A/O (LED) State of interface line A/O
ON: answer (upper channel)
Da/Te (button) data/test button

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1.13 Backpanel LOGEM ®928
1234
Element Description
1telephone access jack (RJ12) for dial line
and 2 wire leased line
2RJ12 jack for 2/4 wire leased line
via DBU board (optional)
325pole sub D jack (acc.to ITU-T V.24/V.28)
4power supply connector (2pole) for
power supply cable of the external adapter
Modem Description