ZETRON 748, Technical Manual

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Operation
44 025-9368H
Trailing steering digits recognized by the Model 748:
5 = access code for mobile repeat (dispatch) mode
7 = mobile to mobile, pager, Talkback, or Tone and Voice pager
* or 9 = mobile to telephone
Disconnect ANI
Before a user can sign off using a mobile or portable, a Disconnect ANI (Automatic Number
Identification) code must be assigned to the user. This code provides the mobile or portable with a
way to terminate the call in progress. Without it, the interconnect must rely on timeout timers to
terminate a call. The
Disconnect ANI gives the mobile or portable “control” over the interconnect at
all times.
Once a valid Access ANI has been identified, that user's Disconnect ANI is put into the disconnect
table. The interconnect now knows who has signed on, and how they are required to sign off.
ANI Digit Timing
Single digit ANIs have a minimum on time requirement of 500 milliseconds to be considered valid.
This includes Short sign-on from the radio channel, single digit
Disconnect ANI .
Multi-digit ANI sequences have no minimum on time requirements. Access ANI and Disconnect ANI
sequences look at the setting of Fast ANI access . The average speed of the decoded ANI must be
five digit per second or greater when enabled and one digit per second or greater when disabled.
SCHEDULED TELCO ACCESS
This feature is included in the Selcall and Roamer versions of the Model 748. It allows the system
operator to give priority to different user groups based on time of day and day of the week. If you
restrict interconnect to normal business hours, 9:00 AM to 5:00 PM for Monday through Friday, you
can limit access to the interconnect outside of these hours on a per user (radio) basis. This feature
can also be useful in a system where dispatch and interconnect are mixed. You can disable
interconnect during business hours (giving priority to dispatch) and still be able to offer interconnect
after hours.