Motorola MSF 5000 Instruction Manual page 251

MSF
5000
Instruction Manual
AppendixC
MUxXbus
Descriptions
RX1
ACT
RX PL
DS
R1
PL
DT
RX CD
DT
R1 UN
SQ
R2 MUTE
68P81092E11 3/19/94
MUXbus Overview
Receiver
1
Activity
(A2/D0)
Indicates that
the
primary
receiver has met the qualifiers set for it on the current
mode.
Qualified receiver audio activity can
be set for each
mode
by
the
Field
Programmer
or
with
option C674. Qualified receiver audio
activity
is determined
by any combination of MUXbus
bits
RX PL
DS,
R1
UN
SQ,
R1
PL
DT,
and
AUX
DET. The SSCB
responds
to an
active RX1
ACT
by opening
the
RX1 audio
gate.
This
gates
RX1 audio
to
both the line audio and select audio (local speaker) lines.
RX1 audio
is also gated
to the
SSCB
repeater
audio
gate.
An
RX1
ACT
must occur
before
a
RPT PTT will
be issued to open the repeater
audio
gate.
Receiver PL/DPL Disable
(A3/D3)
Indicates that the station has reverted to carrier squelch
only
receiver operation.
The monitor
and receivers Squelch on/off wireline functions utilize
RX PL
DS.
Also,
the station control module front panel
PL Dis
switch activates
RX PL
DS.
This bit
is
usually
set
by
the
TTRC
in response
to a
monitor command from
a
console.
Receiver
1
PL/DPL
Detect (A3/D2)
Active when Private Line
(PL), Digital
Private Line
(DPL),
or
Connect Tone
(CT)
coded squelch is being detected on Receiver
1.
Receiver
1
Code Detect (A3/D1)
Indicates
a
Receiver Code Detect due
to
a
receipt of Secure
(12
Kbit)
data on
Receiver
1.
Receiver
1
Unsquelch (A3/D0)
Active
when
the
Receiver
1
audio carrier squelch circuit on
the
SSCB
detects
on-channel
RF
activity.
R1
UN
SQ
is used for audio
gating
(refer
to
RX1
ACT), not
for repeater
keying
(refer to
RPT PTT).
Receiver
2 Mute
(A4/D3)
Causes the second receiver audio
to be
muted or attenuated. The second receiver
option is not yet supported, so
this bit has no effect when active.
C-5
C-5