ZETRON 748, Technical Manual

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Programming
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channel. The radio user then keys up and dials the extension for receiving. Receiving answers the
phone and takes down the needed information to check on the part. To terminate the call, key the
radio and press “#” for greater than 500 msec and then unkey.
Phone-to-Mobile operation:
Receiving has verified the part needed by maintenance has arrived. The receiving clerk places an
internal call to the extension for the Model 748. The Model 748 waits the programmed Rings before
answer, answers the incoming call and then issues the Overdial prompt (default is 925 Hz). At the
prompt, the receiving clerk overdials “10” for maintenance. The Model 748 keys the transmitter with
127.3 Hz and sends ringing on the channel. Only radios programmed to unsquelch with 127.3 Hz
will hear the ringing. This means that neither manufacturing or security will hear the ringing
intended for maintenance. Maintenance can answer by just pressing “PTT” on their handheld. The
Model 748 sees carrier and 127.3 Hz sub-audible and connects receiving and maintenance.
Receiving informs maintenance that their part has arrived. To terminate the call, key the radio and
press “#” for greater than 500 msec and then unkey.
Mobile-to-Mobile operation:
Manufacturing needs to contact security to open a storage area. To reach security on the radio, key
the radio and press “7” for greater than 500 msec and the unkey. The Model 748 will see “7” + 74.4
Hz as User 21 (manufacturing) and originate a mobile-to-mobile call. The Model 748 will key up
with 74.4 Hz and send back the Overdial prompt (default is an 925 Hz beep). At this point the Model
748 acts just like it does in a Phone-to-Mobile call, only the originator is another radio instead of a
phone caller. Manufacturing keys the radio and dials “50” for security. The Model 748 will switch
encoding to D031 and send ringing on the channel. During the time of ringouts to security, unless
manufacturing is in “monitor mode”, they will not be able to hear the ringing. Security can answer
by just pressing “PTT” on their handheld. The Model 748 sees carrier and D031 sub-audible and
switches encode to 74.4 Hz and enables repeat audio. The Model 748 will perform tone/code
translation between the user groups. Either radio can key up and send “#” for greater than 500 msec
to terminate the call when complete.
As you can see from this example, simple communications can be accomplished with Short sign-on.
Each user group only hears calls intended for them, but can still contact each other as required.
Multi-digit ANI
Our example system for Multi-digit ANI is installed at radio site with good coverage of the local
metro area. It has a single phone line installed at the site. Current billing is flat rate per month per
radio. It has two customers with multiple radios each on the system. The radio shop also uses it for
dispatch and interconnect. The radio shop will soon be moving to a different channel and would like
to load this site with more customers and bill for long distance.