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Section II. PRINCIPLES OF PULSE-CODE MODULATION
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TM-11-5895-458-14 Low Capacity Tactical Radio Relay Frequency System Manual
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Figure 3-1. Multiplexer TD-204/U.


TM 115895-45-14
CHAPTER 3
COMPONENT DESCRIPTION AND DATA
3-1. Multiplexer TD-204/U
3-2. Multiplexer TD-7654/G
a. .Use.
a Use.  The TD-754/G provides the capability for
Multiplexer TD-204/U (fig. 3-1) is a
12/24/48-channel pcm cable transmission interface unit.
transmission of pulse-code-modulation (pcm) pulses
Its transmit section accepts tdm pcm output signals from
through cable transmission systems. Pcm pulses from
a TD-660/U or TD 660A/G or- from another TD-204/U or
Multiplexer TD-660/G, or similar equipment, are applied
TD-7564/G, and processes these signals for cable
to the TD-754/G. In the TD-754/G, the pcm pulses are
transmission. The receive section accepts a pcm signal
encoded into another pcm format and transmitted at a
from the transmission cable, processes and retimes it.
2304-kHz rate through a cable link to another TD-754/G
In addition, the TD-204/U provides for up to 39 TD-
or TD-204/U.  The TD-754/G, or TD- 204/U at the
206/G's in the transmission cable, and contains an order-
opposite end of the cable link decodes the pcm pulses
wire facility.
into their original pcm format and applies them to a TD-
b. Technical Characteristics.
660/G or similar equipment.
The TD-754/G also
provides cable current to power Restorers, Pulse Form
TD- 206/G installed in the cable link. Order wire facilities
Channel capacity .............. 12, 24, or 48
that operate over the cable link are also contained in the
Input voltage ..................... 109 to 121 volts, 47 to 63
TD-754/G to provide a phone link between terminals.
Hz.
b. System Information.
Power consumption .......... 62 watts maximum
(1) Two TD-754/G's can be operated on a
Pcm input or output signal:
cable link that extends to 40 miles. The pcm pulses
Impedance ................... 91 ohms
from a TD-754/G are transmitted through Cable
Amplitude
Pulses go positive to ap-
Assembly, Special Purpose, Electrical CX-
proximately 0 volt from a
11230/G or CX-4245/G that connects between
baseline of approximately
each TD-206/G spaced between each mile of
-2 volts.
cable.
Pulse type......................... Binary (full width)
c. Technical Characteristics.
Pulse rate and interval:
12-channel operation... 576 kHz; 1.736 psec
24-channel operation... 1,152 kHz; 868 nsec
Number of audio channels .... 6 or 12
48-channel operation... 2,304 kHz; 434 nsec
Compatible radio set ............. AN/GRC-103
Timing input or output signal:
Compatible cable .................. CX-11230/G or CX24/G.
Impedance ................... 91 ohms
Order wire:
Amplitude..................... Positive going pulses, 2
Facility ............................ Baseband channel in-
volts amplitude.
dependent of pcm traffic.
Pulse type .................... Sharp spike
Frequency response ....... 300 to 1,700 Hz
Pulse width .................. 150 nsec
Signaling frequency ........ 1,600 Hz
Repetition rate ........ .... 576 kHz
Transmit level
9 volts rms min at 880
Repetition rate:
ohms
12-or24-channel operation 576 kHz
(at cable transmit am-
48-channel operation... 2,304 kHz
plifier output).
Pulse width .................. 150 nsec (max.)
Receive level .................. Adjustable 150 mV rms to
Cable input or output signal:
16 volts rms across 880
Impedance ................... 62 ohms
ohms (at cable receive
Amplitude:
amplifier input).
To-cable signal .... Leading edge of pulses
swing 2 volts from zero to
peak.
From-cable signal 30 mV pp nominal
Pulse type .................... Binary dipulse
Bit rate ......................... 2,304 kHz
Pulse width ........ ......... 180 to 230 nsec
Compatible cable .......... CX-4245/G or CX-11230/G
3-1


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