INSYS Modem 336 LL
i-modul Modem 336 LL
Basics
Aug-06
5
Note
For INSYS Modem 336 LL 4.1 and i-modul 336 LL 3.0:
Use
AT&L<n>
to switch between two wire operation (
AT&L0
) and
four wire operation (
AT&L1
).
During four wire operation, one pair each is needed for each transmission path (Origi-
nate
→
Answer and Answer
→
Originate). This will prevent problems with the terminat-
ing set (the part of the modem which separates received and sent data) for strongly mal-
adjusted lines.
Four wire line
Note
For leased line modems, it is required that one modem is operated
in originate mode and the other modem in answer mode
.
For the connection start, the same protocols are used for switched line and leased line
operation.
The manufacturer will deliver completely pre-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
Note
For leased line modems, the same AT commands and S registries as
for switched line modems apply (see the Designer’s Guide i-modul
Modem or the User Manual INSYS Modem 336/56k) The only dif-
ference is the registry
ATS11
. For the switching line modem this
setting defines the DTC time setting, and for the LL modem it de-
fines the switching between Originate and Answer.
Basically, all connection protocols, error correction and compression methods which are
used for switched line operation, may also be used for the leased line mode. The
AT
commands to set the desired protocol are identical to those of the switched line modem.
i-modul 336 LL /
INSYS Modem 336 LL
Answer
i-modul 336 LL /
INSYS Modem 336 LL
Originate
LB1
LB
LA
LA1
LB1
LB
LA
LA1
