Advertisement
4.4 T ALM DS (TOTAL ALARM DISABLE) 0, Dl
The T ALM DS bit mutes all alarm tones until this bit is
deactivated.
This bit will deactivate
the station control
module alarm bits on the Reverse
"Wild Card" bits 1
through 4, but will not affect the other Reverse "Wild
Card" bits on the MUXbus.
Pulsing T ALM DS for 25
msec or longer will release S ALM DS, if active.
4.5
S ALM DS (SELECTIVE
ALARM DISABLE) O,DO
The S ALM DS bit is meant to support a "nuisance avoid-
ance" alarm feature. The console operator can mute in-
progress alarm tones without fear of missing any new
alarms.
For example,
initially all alarm bits (Reverse
"Wild Card" bits, addresses
12 & 13) and S ALM DS are
inactive. An alarm condition activates an alarm bit, and
alarm
tones
are heard.
The wireline
control
pulses
S ALM DS active for 25 msec or longer in response to a
remote control console command,
and the alarm tones
are muted. If the alarm condition were to disappear, the
corresponding
alarm bit would be deactivated,
S ALM DS
would be cleared, and no alarm tones would be heard
since no alarm bit is active. If, instead, a second alarm bit
were activated while the first alarm was active, S ALM DS
would be deactivated
and alarm tones for both alarms
would be heard. The wireline control
could re-enable
S ALM DS, then alarm tones for both alarms would be
muted.
S ALM DS does not deactivate
the MUXbus
alarm bits, but merely mutes the alarm tones.
4.6 RPT PTT (REPEATER
PUSH-TO-TALK)
1, D3
The RPT PTT bit keys the transmitter,
modulating
with
RX 1 Audio if no higher-priority
PTT is active. If a high-
er -priority PTT is active, the station control module deac-
tivates RPT P1T. If the repeater
PTT time-out
timer
(TOT) times out, RPT PTT will be deactivated,
and the
transmitter
will dekey. If repeater knock down (RPT KD)
goes active while RPT PTT is active, RPT PTT will be
deactivated,
PL reverse burst or DPL turn off code (RBI
TOC) will be encoded if appropriate,
and the transmitter
will dekey. RPT PTT is active during repeater
drop-out
delay. RPT PTT is inactive when RBITOC
is encoded.
The station control module turns on RPT P1T, if repeater
audio activity exists on Receiver 1, and if RPT KD is inac-
tive, and if no higher-priority
PTT is active. "Repeater
audio activity" is set for each channel by station control
module code plug qualifiers. These qualifiers determine
what combination
of the four MUXbus bits RX P L DS,
Rl PL DT, RPT USQ, and AUX DET are ANDed to ob-
tain RPT
PTf.
Line, Local, and Repeater
PTT priorities
are set for each channel by station control module code
plug qualifiers.
4.7 LIN PTT (LINE PUSH-TO-TALK)
I,D2
The LIN PTT bit keys the transmitter,
modulating
with
TX Audio (inbound wireline) if no higher-priority
PTT is
6
68P81114E03
active. LIN PTT stays active if a higher-priority
PTT is ac-
tive. LIN PTT is inactive when
RBITOC
is encoded, un-
less the RBITOC is caused by the Line PT T TOT timing
out. If the station is so equipped, LIN PTT switches the
antenna switch to its transmit state. Line, Local, and Re-
peater PTT priorities are set for each channel by station
control module code plug qualifiers
4.8
LOC PTT (LOCAL PVSH- TO-TALK)
1, Dl
The LOC PTT bit keys the transmitter,
modulating with
Local Audio if no higher priority PTT is active. LOC PTT
says active if a higher priority PTT is active. LOC PTT is
inactive when RBITOC is encoded, unless the RBIT OC
is caused by the Local PTT TOT timing out. If the station
is so equipped, LO C PTT switches the antenna switch to
its transmit state. LOC PTT is active if the PTT switch is
depressed on the local microphone
plugged into the sta-
tion control module front panel CONTROL
connector
J812. Line, Local, and Repeater PTT priorities are set for
each channel by station control module code plug qualifi-
ers. The front panel XMIT switch on the station control
module will activate TX PL DS and key the station with-
out activating the LOC PTT bit on the MUXbus. This key
will be without
PL, DPL, or audio (silent carrier). As
thusly defined,
it
is not a true P1T, and can be overridden
by any other PTT
4.9
INTCOM (INTERCOM)
1, DO
The INTCOM bit is active if the remote control module
INTERCOM
switch is actuated.
When INTCOM
is ac-
tive, the station control module treats LOC PTT as an In-
tercom P1T. Local Audio is gated to the wireline (out-
bound wireline) when a local PTT is generated,
but the
transmitter
is not keyed. When LOC PTT is not active,
remote control console audio (inbound wireline) is gated
to the 112-watt local audio amplifier.
4.10 TX PL DS (TRANSMIT PLIDPL DISABLE) 2, D3
The TX PL DS bit mutes encoded PL or DPL. The Trans-
mit PL Strip wireline option utilizes this bit. If PL or DPL
is being encoded when TX PL DS goes active, then RBI
TOC will be generated
before muting PL or DPL. This
bit will also be set active whenever PLI DPL encoding is
disabled, such as during an auto ID transmission,
or if the
front panel XMIT switch on station control module is ac-
tivated.
4.11 TX ACT (TRANSMITTER
ACTMTY)
2, D2
The TX ACT is a status only bit, and indicates that the
transmit rf channel (outbound) is ready. TX ACT goes ac-
tive after a keyup, when the transmitter
power output has
stabilized. In the event of a PA failure on keyup, TX ACT
stays inactive
(doesn't
glitch). TX ACT goes inactive
when the station control module dekeys the PA. TX ACT
is inactive during RBITOC.
4.12 RX2 ACT (RECEIVER 2 ACTMTY)
2,
m
The RX2 ACT bit indicates whether second receiver au-
dio should be used. The second receiver control module
7/15/90
Advertisement
