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4.2.7 R
ECEIVING A
Unlike a fax call, inbound computer (modem) calls are usually not
accompanied by any tones; except when they use reverse modem protocol
(see below), calling computers and modems remain silent until a modem
answers the call. The MODEM port of the ASD-4 is secured, which means that
there are normally only two ways callers can access this port from a remote
location. One way is to enter a tone access code from a touch-tone phone or
other device that produces tones (a modem, for example). The second way is
to use reverse modem protocol. If they want to direct a computer call to your
ASD-4's MODEM or FAX port, instruct callers to use one of these methods
(both of them are explained below).
Most (though not all) computer telecommunications are handled through
modems, so a modem is used in the examples below. Procedures will be
roughly similar for other devices, but callers should see their devices'
manuals for more information.
The MODEM port becomes unsecured when either the Automatic TAD
Transfer feature or the Automatic No Answer Transfer feature is set to
transfer calls to the MODEM port. In other words, be careful when you
use these ASD-4 features, because they make it possible for anyone to
gain access to the MODEM port.
We recommend that you turn the ASD-4's CNG Detection feature OFF if
you connect a modem that isn't capable of receiving faxes to the FAX
port. See Section 5.3.7 for how to do this.
4.2.7.A Using an Auxiliary Phone to Dial Your MODEM or FAX Port's Access Code
Instruct callers to attach a "T" or "Y" (2-to-1) adapter to the wall jack where
their modem's phone line connects. Have the caller plug their modem into
one side of the adapter, and plug a standard tone phone into the other side
of the adapter. When callers tell their modem to call your modem, they must
either lift the phone's receiver off the hook after the modem dials the
number or use the phone to dial your modem manually.
Next, callers should listen for the ASD-4 to answer, then press keys on the
phone to enter the MODEM or FAX port's access code between ring signals.
(The MODEM port's access code is factory-preset to [2] [2]. The FAX port's
access code is factory-preset to [1] [1].) When the modem answers, callers
should hang up the phone and begin their transmission.
C
(M
OMPUTER
ODEM
) C
MODEM
ALL AT THE
NOTE
NOTE
NOTE
CHAPTER 4: Operation
FAX P
OR
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