Basics
INSYS Modem 336 LL
i-modul Modem 336 LL
4
Aug-06
1
Basics
Leased line modems are used when a permanent connection between two data termi-
nals is required.
For these connections no regular switched line is used, but a dedicated (leased) line. This
can either be a line leased from Telekom, or just an unused pair e.g. on the premises.
Leased line modems establish a connection via such a two wire line immediately 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 366 LL / i-modul 336 LL supports both variants. They operate polarity-
independent which means that a1 and b1 are interchangeable.
The two wire connection is the most used connection type.
Unserviced line
Serviced line
i-modul 336 LL /
INSYS Modem 336 LL
Originate
i-modul 336 LL /
INSYS Modem 336 LL
Answer
LA
LB
LA
LB
LA
LB
i-modul 336 LL /
INSYS Modem 336 LL
Originate
i-modul 336 LL /
INSYS Modem 336 LL
Answer
LA
LB
