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Page Title: Digital Data Modem 1A12 Cable-to-Radio Circuits Functional Block Diagram Description
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TM 11-5820-695-35
the digital orderwire 32 kHz clock signal. The clock and
The functional relationships between the cable-to-radio
retimed CVDOW signals are routed to module A7.
plug-in components and chassis circuits in digital data
modem 1A12 are shown in figure 5-7 for the
(5)  Alternate bits in the CVDOW signal are
synchronous  mode  and  in  figure  5-7.1  for  the
DOW  and  DVOW.
Those  bits  have  known
asynchronous mode.
Each plug-in component is
characteristics and are therefore detectable. The DOW
functionalized and the main signal paths (heavy lines
detector in digital orderwire demultiplexer 1A12A7
through each plug-in component and between plug-in
adjusts the phase of the 16 kHz clock so that the DOW
components) are shown.  In addition the control and
and DVOW demultiplexer each operate on the proper
alarm functions are shown.  The operation of the
sequence of alternate bits. The DOW and DVOW data
synchronous mode plug-in components is described m a
and timing signals are applied to line drivers and routed
through f and the operation of the asynchronous plug-in
to the local OCU and DLED.
components is described in a.1, b.1, and g.
2-5. Digital Data Modem 1A12 Cable-to-Radio Circuits
Functional Block Diagram Description (fig.  5-7
a. Cable Digital Regenerator lA12A2 (Synchronous
Mode) (fig 5-7 and 5-30).
(1)  The input signal to cable digital regenerator
1A12A2 is designated FRCX (pcm/ orderwire/dc) Since
the length of cable through which the signal is
transmitted may vary up to a maximum of one mile, a
cable simulation net
Change 6 2-10


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