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Not all fax machines transmit this signal when they place a call. When the
ASD-4 receives a call from a machine that doesn't transmit CNG signals, it
can't tell whether the call is a fax transmission or a voice call. Don't assume that
your ASD-4 isn't working properly if it transfers a fax call to your telephone. This only
means that the sending fax machine has not sent a CNG signal. If you answer
your phone and find that the call is a fax transmission, just transfer the call to
the FAX port (see Section 4.2.2).
Most fax machines that produce CNG tones do so when they auto-dial or
speed-dial or when the operator presses the fax machine's START button
after the number is dialed. Usually they do not produce CNG tones
immediately after an operator manually dials a fax number from their
handset; the operator must tell them, perhaps by pressing a START button,
that the call is a fax rather than a voice call. Some fax machines only produce
CNG tones after speed-dialing. For best results, callers should have your fax
number programmed into their fax machine's "speed-dial" memory.
4.2 Standard Operating Procedures
4.2.1 H
ASD-4 H
OW THE
Unless you program the ASD-4 differently, it answers incoming calls on the
first ring. (When exclusion isn't maintained, all the phones on the ASD-4's
line, except those connected to the ASD-4's TAD or PHONE port, ring this
one time. Do not answer an extension phone on this ring. See Section 4.2.2.B.)
From the time the ASD-4 picks up a call until the call is answered "for real" at
one of the devices on the same line, the ASD-4 keeps the switching process
transparent to the caller by sending the caller a ring-back tone.
After the ASD-4 answers the call, it listens for:
• a CNG tone,
• an access code for the FAX or MODEM port, or
• a reverse modem tone.
If the ASD-4 detects any of these signals, it automatically routes the call to the
appropriate port. If the ASD-4 does not detect a signal, it routes the call to the
TAD and PHONE ports. When a phone connected to the TAD or PHONE
port rings, it means that the call is coming from one of the following sources:
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NCOMING
CHAPTER 4: Operation
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