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Section II. EQUIPMENT DESCRIPTION AND DATA
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TM-11-5815-238-20 Teletypewriter Sets AN/GGC-3 AN/GGC-3A AN/GGC-53 AN/GGC-53A and Teletypewriter Reperforator-Transmitters TT-76/GCC TT-76A/GGC Manual
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BASIC HIGH-LEVEL TELETYPEWRITER SYSTEM
TM 11-5815-238-20
1-9. DIFFERENCES BETWEEN MODELS
Refer to Operator's Manual TM 11-5815-238-10.
1-10. EQUIPMENT DATA
Refer to Operator's Manual TM 11-5815-238-10.
1-11. SAFETY, CARE AND HANDLING
Observe all WARNING, CAUTIONS and NOTES in this manual. This equipment can be extremely dangerous if these
instructions are not followed.
Section Ill. TECHNICAL PRINCIPLES OF OPERATION
1-12. GENERAL
Major mechanical components for high-level and low-level equipment are the same while their major electrical
components are different.  The technical principles of operation for plain and lettered models of teletypewriter
reperforator-transmitters are the same.
1-13. SIGNALING CODE
In standard teletypewriter operation, the code for different characters always consists of five units of an equal length
of time. These units are called mark pulses and space pulses; the five-unit mark-and-space code group for the letter
X is given below.
Standard teletypewriter signals are transmitted by neutral and polar operation. In neutral operation, current flows
through a circuit in only one direction. Mark pulses are current pulses, space pulses are non-current pulses. In polar
operation, current flows through a circuit in both directions. Mark pulses are current pulses in one direction, space
pulses are current pulses in the opposite direction (opposite polarity).
High-level TT-76(*)/GGC units are designed to receive both neutral and polar pulses but are wired to send only
neutral pulses.
Low-level TT-699(*)/GGC units are designed to receive and transmit 6 volt polar pulses only.
1-3

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