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AT Commands
5-34 Modem 3600
Note
For operation with modems that use V.33 as the modulation
type, the Modem 3600 must be set up to V.33.
2-Wire Operation
In 2-wire operation, the modem is a full-duplex modem able to operate
over 2-wire leased or PSTN lines.
2-Wire Leased Line Operation
The 2-wire leased line is connected to the TELSET/LEASED LINE
jack; the DIAL jack connects to a 2-wire dial-up line for dial backup.
The leased line connects the local and remote modems directly and
dialing is not necessary. One of the modems must be configured for
forced answer and the other for normal originate. When connected via
leased line the modems will connect and begin communicating with
each other.
The &L command is used to select private line (leased line) operating
mode. The *OR commands select the origination or answer mode when
operating in the leased line configuration.
Note
DTR must be held high in 2-wire or 4-wire leased line
operation. This is accomplished by DTE control, wiring pin
20 of the digital interface cable high, or by selecting the
option IGNORES DTR. If DTR is terminal controlled, loss of
synchronization can be corrected by cycling DTR. This
makes the modem initiate the 2-wire training sequence. DSR
goes off during the training procedure.
2-Wire Dial-up Operation:
Connection to the telephone network is through the DIAL jack. A
standard telephone can be connected to the TELSET/LEASED
LINE jack for manual dialing.