Instruction manual

Control Unit
Touch-Tone Receivers
In addition to jacks for connecting lines/trunks and extensions, various modules
also include components called
touch-tone receivers (TTRs). These TTRs allow
the system to process touch tones entered by outside callers for special
purposes, such as automated attendants that answer calls from people with
touch-tone phones, voice mail systems, and remote access callers who call into
the system and use its services. When your AT&T representative helps plan
your system, he or she makes sure that your modules have enough touch-tone
receivers to support your needs. When you add an application or adjunct to
your system, you sometimes have to make more TTRs available as well. For
information about adding TTRs, see the
Equipment and Operations Reference .
016, 012, and 008 OPT Modules
Extension modules that support single-line telephones or off-premises
telephones (OPT) must have ring generators so that the phones get electrical
current for their ringers. All 016 extension modules, which are compatible only
with Release 4.0 and later systems, include built-in ring generators. Since late in
1993, 012 and 008 modules have come with ring generators built in. Earlier
modules required AT&T technicians to install ring generators. If your 008 or 012
module has a ring generator, either added or built-in, you should see a label on
the front of the module telling you that the ring generator is included.
Also, 016, 012, and 008 modules allow the connection of T/R devices directly to
the control unit, without the need for a telephone and adapter at an extension.
You can use them to hook up fax machines or PCs with modems, for example.
For more information, see “Adjuncts,” later in this chapter.
Modules Supporting Lines/Trunks
Table 3−1 summarizes the modules that support lines/trunks. This section
describes a few module features and modules that need additional explanation.
NOTE:
Modes of operation affect features and hardware. For example, Direct Inward
Dialing is only supported in Hybrid/PBX mode, so if your system uses a different
mode of operation, you don’t need a DID module. For more information about
modes, see Chapter 2, “About the System.”
Power-Failure Transfer Telephones
When your system was planned, the AT&T representative(s) made sure that you
had a module to support one or more power-failure transfer (PFT) telephones.
These telephones, which are connected to a special line/trunk jack, allow you to
make and receive calls during a commercial power failure. They do not affect
the capacity of the modules.
System Components
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