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TM 11-5820-695-35
and the control and alarm signals between assemblies in
3. In the radio repeater mode of operation,
the T-1054(P)/GRC-144(v). The processing of signals
the CABLE TO RADIO MODEM indicator is
within complex assemblies such as digital data modem
not lighted.
1A12,  orderwire  assembly  1A13,  and  electrical
frequency synthesizer 1A14 are explained in subsequent
a.
Transmit Path.  The transmit (cable-to-
paragraphs.
The radio patch panel in the T-
radio) signal path through the T-1054(P)/GRC-144(V) is
1054(P)/GRC-144(V) permits connecting Radio Set
shown with the FROM CABLE signal entering the T-
AN/GRC-144 in any one of four configurations. Figure
1054(P)/GRC-144(V) on the left and the RF OUTPUT
5-6 illustrates the connections for the cable terminal
signal leaving on the right-hand side of figure 5-6.
configuration
(CABLE
TERMINAL
OPERATION
indicator on radio patch panel is lighted).  Both the
(1)  The  FROM  CABLE  Input  (a
radio-to-cable circuits and the cable-to-radio circuits in
combined pcm, ow, and de signal) is applied to the
digital data modem 1A12 are used in the cable terminal
cable to-radio circuits of digital data modem 1A12. The
configuration. In the other configuration, the radio patch
CABLE TO RADIO MODEM indicator on meter panel
panel is used to connect external equipment in the
assembly 1A15A8 and a remote traffic in indicator are
signal path and to bypass the cable-to-radio circuits in
controlled by the cable-to-radio circuits in 1A12 through
digital data modem 1A12 or to completely bypass digital
the radio patch panel.  For normal input pcm traffic
data modem 1A12 (para 2-2b, c, and d). The following
conditions, the CABLE TO RADIO MODEM and the
subparagraphs describe the transmit (cable-to-radio)
traffic in indicators are lighted green. If an input pcm
and the receive (radio-to-cable) signal paths through the
traffic failure is detected by the cable-to-radio circuits in
T-1054(P)A/GRC-144(V). The control and alarm signals
1A12, the CNTRL ALARM and the external traffic in
in the T-1054(P)/GRC-144(V) are also described.
indicators light red. The CABLE TO RADIO MODEM
indicator lights red only when a functional failure exists
NOTES
in 1A12 and actual pcm traffic is present. If pcm traffic
is not present, this alarm is inhibited (remains green)
1.
In both radio repeater modes of
even if a functional failure exists. The pcm, ow, and dc
operation  and  in  the  cable  terminal
portions of the input signal are separated in the cable-to-
radio circuits.
The cable-to-radio circuits reshape,
(nonstandard) mode, the external traffic in
retime, and convert the pcm train to a level compatible
and traffic out indicators are not lighted.
with the radio circuits. The regenerated pcm output (to
radio pcm) is routed through the radio patch panel to
2.
In  both  nonstandard  modes  of
attenuator assembly 1A3. The ow signal is amplified in
operation, the CABLE TO RADIO MODEM
the cable-to-radio circuits.  The amplified ow signal
and RADIO TO CABLE MODEM indicators
output (thru ow rec) is routed through the radio patch
are not lighted.
panel to orderwire
Change 6 2-4.2


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