E F Johnson Company 2422001-1 Benutzerhandbuch
INTRODUCTION AND OPERATION
1-8
August 2000
Part No. 001-2001-200
Part No. 001-2001-200
In its time slot, each repeater places information
on the data bus indicating its status. If a repeater is not
busy, only start bits appear in its slot. If a repeater is
busy, it places in its slot the Home repeater and ID
code of the mobile receiving the call on that repeater.
If a repeater number is unassigned, nothing appears in
that time slot.
busy, only start bits appear in its slot. If a repeater is
busy, it places in its slot the Home repeater and ID
code of the mobile receiving the call on that repeater.
If a repeater number is unassigned, nothing appears in
that time slot.
1.13.2 MOBILE DATA MESSAGE ORDER
Each repeater monitors all the time slots on the
repeater data bus. If it detects its number in another
time slot, it begins transmitting an additional data mes-
sage to its mobiles. This message tells mobiles pro-
grammed to detect that ID code to go to that repeater
to receive a call. This additional message continues
for as long as the mobile is transmitting on the other
repeater.
time slot, it begins transmitting an additional data mes-
sage to its mobiles. This message tells mobiles pro-
grammed to detect that ID code to go to that repeater
to receive a call. This additional message continues
for as long as the mobile is transmitting on the other
repeater.
The sequence of data messages transmitted on a
home repeater is as follows: Every third message is to
the mobile currently receiving a call on that repeater.
Then alternating between these messages are messages
to its mobiles that have been trunked to other repeat-
ers. For example, assume that fivedifferent mobiles on
the mobile currently receiving a call on that repeater.
Then alternating between these messages are messages
to its mobiles that have been trunked to other repeat-
ers. For example, assume that fivedifferent mobiles on
a five-repeater system are making calls. If all have
Repeater 1 as their home channel (not very likely in
actual practice), the data message order on Repeater 1
is as follows: 1 2 3 1 4 5 1 2 3 and so on.
Repeater 1 as their home channel (not very likely in
actual practice), the data message order on Repeater 1
is as follows: 1 2 3 1 4 5 1 2 3 and so on.
1.13.3 ID VALIDATOR OPERATION
If the ID Validator is used, it is programmed with
the status of up to all 5000 home repeater/ID code
combinations possible with a 20-channel system.
Each combination is programmed as either valid or
invalid. Information in the twenty time slots on the
repeater data bus is monitored. If an invalid home
repeater/ID code combination is detected, the ID Vali-
dator places in time slot 21 the number of the repeater
being used by the invalid mobile and also the ID code.
When a repeater detects its number in slot 21, it trans-
mits the turn-off code (31) to the mobile receiving the
call. That mobile then squelches and resumes moni-
toring its home channel. This effectively disables the
invalid mobile because it cannot talk to anyone. When
the turn-off code is sent, the repeater places "21" in the
repeater position of its time slot to indicate to the ID
validator that turn-off has occurred.
combinations possible with a 20-channel system.
Each combination is programmed as either valid or
invalid. Information in the twenty time slots on the
repeater data bus is monitored. If an invalid home
repeater/ID code combination is detected, the ID Vali-
dator places in time slot 21 the number of the repeater
being used by the invalid mobile and also the ID code.
When a repeater detects its number in slot 21, it trans-
mits the turn-off code (31) to the mobile receiving the
call. That mobile then squelches and resumes moni-
toring its home channel. This effectively disables the
invalid mobile because it cannot talk to anyone. When
the turn-off code is sent, the repeater places "21" in the
repeater position of its time slot to indicate to the ID
validator that turn-off has occurred.