ZETRON 748, Technical Manual

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Programming
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Mobile-to-Phone operation:
Crew #12 wants needs to have some additional material delivered to finish a job. To reach the office,
press the ANI key on the microphone. The radio keys up and sends an ANI of “104012”. The Model
748 will see “104012” + 103.5 Hz as User 12. The Model 748 will then key up with 103.5 and issue
the Steering digit prompt (default is dial tone) and wait five seconds for a digit. Key up and press “*”
or “9”, the Model 748 will then take the line off hook. The Model 748 will then allow the dial tone
from the central office to pass on to the channel. The radio user then keys up and dials the phone
number for the office. To terminate the call, key the radio and press “#” for greater than 500 msec
and then unkey.
Phone-to-Mobile operation:
The main office wants to change the job assignment for Crew #17. A call is placed to the phone
number that the Model 748 is connected to. 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 clerk overdials “17” for Crew #17. The Model 748 keys the transmitter with 103.5 Hz
and sends the DTMF sequence “104017” followed by ringing on the channel. Only radio “17” is
programmed to unsquelch with 103.5 Hz and Selcall capcode. This means that none of the other
radios on that tone will hear the ringing intended for Crew #17. To answer the call, key the radio and
press “*” for greater than 500 msec. The Model 748 sees 103.5 Hz sub-audible plus “*” and
connects the call. The main office informs crew #17 of their new assignment for the day. To
terminate the call, key the radio and press “#” for greater than 500 msec and then unkey.
Mobile-to-Mobile operation:
Crew #13 wants to know if Crew #19 can drop off a needed tool. To reach Crew #19 on the radio,
press the ANI key on the microphone. The radio keys up and sends and ANI of “104013”. The 748
will see “104013” + 103.5 Hz as User 13. The Model 748 will then key up with 103.5 and issue the
Steering digit prompt (default is dial tone) and wait five seconds for a digit. Key up and press “7”,
the Model 748 will originate a Mobile-to-Mobile call. The Model 748 will send back the Overdial
prompt (default is an 925 Hz beep). At this point the Model 748 acts just like a Phone-to-Mobile
call, only the originator is another radio not a phone caller. Crew #13 keys the radio and dials “19”.
The Model 748 will encode 103.5 Hz and sends the DTMF sequence “104019” followed by ringing
on the channel. To answer the call, key the radio and press “*” for greater than 500 msec. The Model
748 sees 103.5 Hz sub-audible plus “*” and enables repeat audio. Crew #13 can then request the tool
from Crew #19. To terminate the call, key the radio and press “#” for greater than 500 msec and then
unkey.
Steering Digit Applications
The Model 748 follows the RCC convention of using trailing steering digits for sign-on. For most
installations this won't present a problem. Leading steering digits can be supported with a little
creative programming. We will show two examples of programming a user (radio) for the same
privileges and same ANI, one using trailing steering digits, the other using leading steering digits.
When using a trailing steering digit, a Steering digit prompt (default is dial tone) is issued and
additional time (five seconds) is allowed for entering the steering digit (the Model 748 already
knows it has a valid ANI). When using a leading steering digit, the steering digit becomes part of the
ANI and all the rules for entering ANIs apply.