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SIP379C Signal Multiplexing Training Course

Early in the development of telecommunications, it became evident that techniques were needed to include more information into a common path or channel. The earlier development was that of frequency division multiplexing in which two or more signals share a common carrier by using different frequency bands within the same channel. Later, time division multiplexing was developed. In this technique, each of the multiple signals is assigned a different time slot within a single channel. This training course explores both these technologies from a theoretical and experimental perspective.

EQUIPMENT SPECIFICATIONS
The following major items are supplied with this course:

Frequency Division Multiplex Insert Panel

	31.25 KHz pilot tone derived from a 4 MHz crystal oscillator for introduction to telephony FDM techniques
	Four FDM channels at 312.5, 375, 437.5 and 500 KHz
	Distinctive modulation per channel (sine waves, square wave, and triangular wave)
	Discriminator, PLL and quadrature detector FM demodulators
	Fiber optic link between transmitter and receiver section
	Two channel external modulation capability
	Built-in audio amplifiers for reproduction of stereo input
	Narrow-band FM modulation
	Dual transformer-coupled bandpass receiver stages for good channel separation
	Multiple test points for observations and measurements of important signals and waveform

Time Division Multiplex Insert Panel

	Composite signal of five pulse-amplitude modulated (PAM) analog signals
	Four 1.5 ms time slots for four separate data channels plus one channel for synchronization
	Phase-locked loop (PLL) used to insure correct synch
	Fiber optic link between transmitter and receiver
	Dual stereo channel external modulation capability
	Built-in audio amplifiers for reproduction of stereo input
	Multiple testpoints for observations and measurements of important signals and waveform

ADDITIONAL SUPPLIED APPARATUS
Fiber Optic Interface Cables, 1 m and 3 m

REQUIRED EXTRA EQUIPMENT
Power Supply Base 120/240 VAC, 50/60 Hz

RECOMMENDED OPTIONAL EQUIPMENT
Dual 8 W Speakers With Cables

LABORATORY MANUAL
The following Table of Contents indicates the scope of this theoretical and experimental study of FDM and TDM techniques.

	The Transmission of Messages
	FDM Systems Design
	Synthesizing of Frequencies in a Channel Bank
	FM/FDM Transmitter Subcarriers
	The FDM Experimental Receiver System

	Time Division Multiplex
	Time Division Multiplex Transmitter/Receiver Design
	Pulse Code Modulation (PCM) and Advanced Multiplexing Techniques
	PCM Transmission Over Microwaves

WEIGHT
Total weight including the TDM and FDM panels, Power Supply Base and Panel Base, and a pair of speakers is approximately 8 lb./3.6 Kg.