Specifications

Overview
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Voice Storage System
This section describes the voice storage system used in the paging terminal. It describes
the operation of the voice system, how to install the voice card, how to set the mode
switches on the card, how to use the test pins to troubleshoot the voice card, and how to
upgrade the software on the card.
Overview
For systems requiring voice storage capacity (such as for PageSaver™), the Adaptive
Differential (ADPCM) Voice Storage option (950-9061) can be installed. With ADPCM,
voice audio can be stored with almost no perceptible degradation in audio quality.
Multiple channels can record or play simultaneously, even playing the same single
message in parallel. Imagine the worst scenario that a paging terminal has to deal with
several telephones all ringing at once. Now watch how the Model 2100 or 2200 with the
Voice Card is able to handle it: as the trunks are answered, the Voice Card begins playing
the “Welcome” message; each caller hears it at the same time. Halfway through, another
telephone begins ringing. This does not present a problem. The Voice Card begins playing
on another channel and that caller, too, gets the complete “Welcome” message (no caller
has to wait for the message to wrap around to the beginning because each caller gets a
dedicated playback channel). As each message completes, the Voice Card switches modes
and begins recording the callers. With the messages complete and safely stored on disk,
the terminal hangs up, answers other calls, and repeats the cycle while the recorded
messages are replayed for broadcast through the Station card.
For the storage medium, the Voice System on a Model 2200 uses a long-life hard disk. Not
only does this provide non-volatile storage for voice messages, but it also means that they
can be written as files of virtually any size up to capacity of the hard disk. No extra space
is wasted for short messages because the file is only as large as necessary.
An additional feature stretches hard disk and paging channel economy by shrinking
message length. The Pause Compression feature makes this possible by removing