Boca Pro16 Series - Leased Line Operations

57
BOCA PRO16 Reference Guide
As soon as your modem connects to a remote modem it will assert the
DSR and DCD signals.
Hanging Up
Your modem will hang up and return to quiet asynchronous mode if the
carrier is lost for longer than the period defined by S Register 10 or if DTR
is lowered.
Answering Calls
Whenever your modem receives an incoming call it will assert the RI
signal. The terminal may accept the call by asserting the DTR signal as
soon as the number of rings defined by S Register 0 is reached. The
terminal may refuse the call by keeping DTR low eight seconds after the
number of rings in S Register 0 is reached.
Your modem will not dial the stored number in response to DTR being
asserted between the time an incoming call is initially detected and the
call being cleared.
Leased Line Operations
A leased line, or private line, is a telephone line that permanently
connects two or more locations. The leased line does not have any
switching equipment associated with it. Leased-line operation with the
modem is selected with the &L command.
The &L command informs your modem that communications will occur
over leased lines, with no answer tones being generated by the modem.
If the modem detects a loss of the remote carrier signal while leased-line
operation is selected, it will attempt to re-establish the connection rather
than hang up.
If you select leased line operation with the &L1 command, you must
issue the ATA command to answer a call, and the ATD command to
initiate a call.
If you use &L2 or &L3 to select Auto leased line operation, you do not
need to issue the ATA or ATD commands; &L2 selects Originate mode
automatically and &L3 selects Answer mode automatically. To dial or
answer, raise DTR; to return to local command state, lower DTR.
Synchronous Modes
Synchronous
Modes
pro16ref.pm6 6/14/96, 2:37 PM57