Teltone m-392 Guida Utente

If in Total Priority Mode, and the modem is active, a priority port going off-hook remains
connected to the local battery feed while the LSS disengages the active port. To do this,
the LSS forces the modem on-hook (terminating the modem carrier), then sends a
disconnect command to the Polling Controller and receives acknowledgment that the
Polling Controller has gone on-hook, then goes on-hook towards the central office to
obtain a new dial tone for the calling party. Because a Polling Controller may not be used
in the Standalone mode, a longer delay will occur before Central Office dial tone is seen
by the user.

If in Emergency Priority Mode, and the telephone at Port 1 goes off-hook, it receives
dial tone (generated internally by the LSS). Dialed digits are monitored. If the dialed
phone number does not match the allowed numbers, the existing connection through the
LSS is not interrupted and busy tone is returned to the telephone user. If, however, the
dialed number matches a programmed emergency phone number, data transfer is halted
and the line made free for the telephone user. The LSS then dials the number and
connects you to the central office line. If you enter the special Access Code, the LSS will
connect you to the central office line; when you receive dial tone, dial any number.

Caution: If the LSS is receiving an incoming fax when you go off-hook in either Total
Priority Mode or Emergency Priority Mode, the LSS will be unable to obtain network dial
tone until the sending fax disconnects or the PSTN times out (usually within 10-15
seconds).

If in No Priority Mode, the modem or other device remains active and the line is not
assigned to another port.

If the LSS receives no response from the Polling Controller after three disconnect
commands are transmitted, which is the normal operation in the Standalone mode, the
LSS goes on-hook toward the central office for several seconds to obtain a new dial tone
for the calling party. Privacy Timeout will not be invoked unless enabled by the user. Read
the Privacy Timeout section later in this chapter for more details.

Any priority disconnection delay during a polling call will be minimized if the polling
modem “Loss of Carrier” disconnect time delay is set to a minimum acceptable duration.
This duration is called the Modem Disconnect on Loss of Carrier.

When the LSS is idle, the incoming central office line is disconnected from the internal
phone line. The LSS answers all calls at the end of the first ring period. It then monitors
for a routing code.

If no code is received by the LSS within 4 seconds after answer, ringing voltage is sent to
the programmed default port and audible ringback is sent to the calling party. If the
telephone is not answered in 1 to 30 rings (default programmed to 12 rings) or a Forced
Disconnect is received from the central office, the LSS terminates ringing and goes
on-hook toward the central office.

If a transfer code is received, the LSS sends ringing voltage to the appropriate port. The
LSS also generates a modem answer tone toward the Polling Host Site, signaling call
progress. When the local modem answers, the LSS connects the local modem to the
central office lines.

If a phone goes off-hook on Port 1 before an incoming call has been connected to a port,

40-400-00015, Rev. 

F

Page 23