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A27. The comparator compares the signal strengths from the receivers and the converter converts the
frequency-shift rf signal into a tty set dc loop control signal.
A28. It converts dc to audio or vice versa.
A29. Time-division and frequency-division.
A30. It allows simultaneous transmission of multiple signals on a single transmission path.
A31. Facsimile.
A32. Compromising emanations.
A33. Reliability, security, and speed.
A34. Reliability.
A35. To ensure continuous, optimum performance of communications systems.
A36. Electromagnetic interference.
A37. Conduction and radiation.
A38. Rf burns and biological, thermal, and neurological effects.
A39. Proper bonding and grounding.
