Installing The Asd-4 As An Extension [On A Single Line With Multiple Single-Line Phones] - Black Box ASD-4 Manual

3.5 Installing the ASD-4 as an Extension [on a Single Line with Multiple
Single-Line Phones]
If you install the ASD-4 as an extension, first determine whether you'll require
that exclusion be maintained on your system. "Exclusion" means that if one of
the telephone devices on your ASD-4 is using the line (during a phone
conversation, fax transmission, or modem session, for example), and another
device on a different port goes off-hook, it will be excluded from the existing
connection. The ASD-4 will send it a busy tone rather than give it access to the
line.
Exclusion is always present among devices attached to the ASD-4. For
example, if a device on the MODEM port is transmitting or receiving data and
somebody picks up a phone attached to the TAD or PHONE port, the phone
will always get a busy tone and the data exchange will not be disrupted.
The TAD and PHONE ports are connected inside the ASD-4, so devices
on these ports never exclude each other.
Exclusion is not automatically "maintained" (extended to extension phones
on the same line) when the ASD-4 is installed as an extension. It is necessary
to work with the phone wiring so that the phone line essentially runs through
the ASD-4 (into its LINE-IN port and out of its PHONE port): This ties all
extension phones on that line into the ASD-4's PHONE port. This might
seem like a lot of trouble to go to, but when you have a fax or modem
attached to the ASD-4, maintaining exclusion ensures that fax or modem
communications won't be interrupted if an extension phone is picked up,
and that the fax or modem won't suddenly drown out a vital conversation.
There are also other effects of exclusion to be mindful of. When exclusion
is not maintained:
• Telephones on the same line as the ASD-4 (except any directly connected
to the ASD-4's TAD or PHONE ports) ring only one time on an inbound
telephone call.
• The ASD-4 can't fully support rotary/pulse-dialing extension phones: You
can place and answer calls with them, but you can't control or program
the ASD-4's features and functions with them.
• The ASD-4's Open Line Notification feature (see Section 5.3.2) is not
available to extension phones.
NOTE
CHAPTER 3: Installation
9