Specifications

203
Operation
OD V16CH13.VOX V16CH13.VOX
This line loads the needed VOX code onto the first and second ADPCM cards. Please note
that if your second ADPCM card has less than 16 channels, the second string must be
modified to reflect the actual number of channels installed. For an 8-channel card, the
second string would be
V8CH13.VOX. Call Zetron Technical Support if you are uncertain
you have the correct vox code.
The
options.cus file must be configured to enable the second PCM highway. This is
done by setting the
TotalPCM parameter to the right value (either 48 or 64). The correct
value is determined by the revision level of the T1 Framer card (702-9551). See Table 25
or Table 26 to determine the correct setting for your system.
Operation
The Voice Card is the principal element of a recording system that also includes the hard
disk and the paging terminal software. It works like this: when the paging terminal is
ready to record audio, it selects a voice card channel and instructs it to start recording. The
voice card stores the digital audio in its memory buffers until they become full then
quickly transfers them to the hard disk. The message builds on disk, one buffer at a time,
until the paging terminal tells the voice recording to stop. At that moment, the recorder
marks the end of message and transfers its last buffer to the disk. Since no particular space
on the disk is reserved for any channel nor are there pre-partitioned maximum size
allotments, no space is wasted.
The playback process is nearly the reverse: once the voice card gets the signal to start
playing the message, it rapidly reads the data, buffer by buffer, from the hard disk and
plays it at normal speed to the audio highway. As soon as it encounters the end of message
marker, it immediately silences the audio highway and ceases disk transfer. It also signals
the paging terminal, which can then immediately reassign the channel to handle another
call.
Since the Voice Card is entirely under control of the paging terminal software, there are no
special instructions or training required to use it. It functions invisibly so that the caller on
the phone need not know or worry if they are speaking live on-the-air or being recorded
for delayed broadcast. Furthermore, the exceptional quality of the playback audio makes
every voice page sound live.
Power Up
The Voice Card comes to life as soon as it is reset. Reset occurs either when the Model
2100/2200 is first powered on or under control of the paging terminal software. Whenever
reset, the Voice Card quickly flashes its lights one by one, then leaves them all off. Reset
completed, the card is ready for instructions from the paging terminal software.