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9 Leased Line Transmission
Leased line transmission is generally used when a dedicated or private line is available
to connect the transmit and receive units.
There are many different types of leased line, 2 wire and 4 wire, with many variants
depending on what is offered by the PTT companies.
Most conventional Modems can operate on leased lines although the cables will differ
from those used on a standard telephone connection.
Baseband Modems offer faster transmission rates over standard Modems and an
example using one of these is given at the end of this chapter.
9.1 Leased line terminology
In leased line terms the receiver or calling unit is set as ORIGINATE.
The transmit unit is set to ANSWER.
9.2 DVST set up for leased line operation
When leased line operation is selected, the type of transmission selected (via the X21 or
the V24 port) is determined by the dial type set in telephone number 0.
If telephone number 0 is set to MODEM, the V24 or Modem port will be used. If either
ISDN 0 or 1 is specified, X21 ports 0 or 1 will be used.
LEASED=
Leased line operation, options are:
(default, OFF)
Dedicated Micros Ltd Page 39
DVST Installation Guide Leased Line Transmission