Lucent Technologies LULCST - Manual (Page 6)

1-2 Overview
Introduction
The Call Stacker is a microprocessor based audio
recording and announcement system. The Call Stacker is used in conjunction
with a paging system to provide buffered announcement play to the paging
system.
Figure 1-1. Call Stacker Unit
The Call Stacker features 5 Input Station (recording) channels, a single Page
Output channel and 3 minutes of recording time.
Up to 5 announcements can be recorded simultaneously, virtually eliminating
frustrating delays encountered when accessing the paging system. The recorded
announcements are queued in order so the first announcement recorded that has
hung up, plays first, followed by the second announcement, etc.
The Call Stacker allows users to verify their announcements before they play to
the paging system. If a user is not content with their recorded announcement,
they can re-record it repeatedly until they are satisfied.
The Call Stacker's Page Output channel interfaces to the paging system's control
unit. Once an announcement is recorded, the Call Stacker plays the
announcement over the Page Output channel to the paging system. While the
recorded announcement is playing, the Page Output channel provides a contact
closure to the paging system.
Once the complete recorded announcement plays to the paging system, it is
erased from the Call Stacker, freeing up the recording time for new
announcements.
The Call Stacker can be configured to record and play back paging zone
selection signals. Between 2 and 4 DTMF digits can be entered prior to recording
an announcement which, upon output, precede the recorded announcement and
select the paging system's paging zone.
NOTE: Associated
equipment would need
to be powered by an
uninterrupted power
supply. The Call Stacker is equipped with battery backup which allows it to operate for up to
two hours, from a fully charged battery, if a power failure occurs.