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Modem Configuration 

 

INSYS Modem 336 LL  

i-modul Modem 336 LL 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

Aug-06

 

2

 

Modem Configuration

 

2.1

 

Configuration Mode

 

The leased line modems have the same 

AT

 command set as the switched line versions. As 

the modems attempt to establish a connection as soon as they are connected to a power 
supply unit, they must first be returned to 

Configuration Mode

The configuration mode is activated by pressing the RESET key (rail version) for a very 
short time (<1s) or by briefly applying a RESET signal (module version, RESET is Low ac-
tive!). 
The OH signal is inactivated (the modem “hangs up) and the modem can be configured 
using 

AT

 commands. 

After the configuration, the 

Connection State

 is activated, when: 

-

 

The operating voltage is switched off and back on, 

-

 

A Reset (

>

3s) is triggered, or 

-

 

The command “

ATZ

” is entered.  

A built-in safety mechanism will furthermore automatically trigger a RESET, if no com-
mand is entered in configuration mode for more than 2 minutes. This mechanism will 
protect the modem from unintentional interference pulses on the RESET line. 
Prior to the configuration, the requested speed must be entered with the AT command 

AT*S<n>&W

, the data format with the AT command (

AT*U<n>&W

), and then saved. Dur-

ing the connection state, the INSYS Modems 336 LL can no longer be addressed via 

AT

 

commands.  
The settings (baud rate, data format, error correction, data compression) must be the 
same to guarantee trouble-free operation.  For varied baud rates, handshaking must be 
used to prevent the modem buffers from overflowing (the modem buffers can accom-
modate approximately 256 bytes in both the receive and send direction. If the individual 
messages that are to be transmitted are shorter than the buffer length, and if a suffi-
cient delay time exists between the messages, even for varied baud rates handshaking 
may be renounced). 

 

 

Note 

By default, handshake is deactivated (

AT&K0

) for the INSYS Modem 

336 LL / i-modul Modem 336 LL 3.0. If handshake (RTS/CTS or 
XON/XOFF) is required, it must be activated with the command 

AT&K<n

> (see manual). 

 
 

 

 

Note 

In contrast to the INSYS Modem 336 LL 4.0 (i-modul Modem 336), the 
error correction for the INSYS Modem 336 LL 4.1 (i-modul Modem 336 
LL 3.0) is set to V.42 by default (

AT\N4

). To enable operation with the 

previous version (error correction by default MNP4 

AT\N5

), the INSYS 

Modem 336 LL 4.1 (i-modul Modem 336 LL 3.0) must be configured 

Summary of Contents for i-modul 336 LL

Page 1: ...Add On Manual INSYS Modem 336 LL i modul Modem 336 LL Modem for LeasedLine operation Aug 06...

Page 2: ...information and their consequences Suggestions for improvements and comments are gladly accepted Trademarks The use of a trademark not shown below is not an indication that it is freely available for...

Page 3: ...3 PING MODE AS CONNECTION SAFEGUARD 7 2 4 STATUS TRANSMISSION OF THE DIGITAL INPUTS 8 2 5 REMOTE CONFIGURATION 8 3 DIAGNOSIS AND TESTING OF THE PATH 9 3 1 LINE OPTIMIZATION 9 3 2 ERROR SOURCES 9 3 3 D...

Page 4: ...tely after being switched on Leased lines are sometimes serviced which means they don t represent a direct two wire connection The end terminals are supplied using a power supply unit The INSYS Modem...

Page 5: ...re configured devices Originate or Answer for two wire operation The difference lies in the factory settings for the S registry values ATS11 und ATS7 Originate ATS11 3 ATS7 50 Answer ATS11 1 ATS7 30 N...

Page 6: ...uested speed must be entered with the AT command AT S n W the data format with the AT command AT U n W and then saved Dur ing the connection state the INSYS Modems 336 LL can no longer be addressed vi...

Page 7: ...ower value 2 3 PING Mode as Connection Safeguard The leased line modems have an additional connection safeguard built in which pre vents a modem connection to hang up This connection safeguard sends a...

Page 8: ...ittable frequency is at ap proximately 0 5 Hz i e the transmission may only be used for slowly changing status lines 2 5 Remote configuration If connection safeguard is activated see Chap 1 3 this may...

Page 9: ...mote terminals were set to different connection protocols V xx to be set with AT MS n The two remote terminals are fixated on different error correction proto cols None MNP V 42 a1 b1 and a2 b2 have n...

Page 10: ...k size AT A If necessary the error correction may be completely switched off using the com mand AT N0 Without error correction however transfer errors on the line are possible which means that the dat...

Page 11: ...Receiving sensitivity Approx 40dBm Device terminator Approx 600 Bridgeable distance Up to approx 15 km possible line interference dependent Connection standards V 34 V 34 V 32bis V 32 V 22 V 22bis V 2...

Page 12: ...hout error correction possible Switch to initialization by briefly pressing the RESET key All switching operation settings may be used but not all settings are suitable for LL Setting of Originate Ans...

Page 13: ...INSYS Modem 336 LL i modul Modem 336 LL Declaration of Conformity Aug 06 13 6 Declaration of Conformity...

Page 14: ......

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