. The Bell System technical journal . e appreciable loss to the circuit permits measuring each of the three pilot frequencies tocheck levels and equalization of operating systems. The panels com-prising the circuit are shown below the oscillator in Fig. 9, B. Mounted on a shelf just below the oscillator is the transmissionmeasuring set, which contains a highly accurate thermocouple andmeter combination with calibrating circuits, wide range repeating coils,a test key circuit, and attenuators, one of which can be set in steps of1 db up to a total of 90 db. Equipment Features Because of
. The Bell System technical journal . e appreciable loss to the circuit permits measuring each of the three pilot frequencies tocheck levels and equalization of operating systems. The panels com-prising the circuit are shown below the oscillator in Fig. 9, B. Mounted on a shelf just below the oscillator is the transmissionmeasuring set, which contains a highly accurate thermocouple andmeter combination with calibrating circuits, wide range repeating coils,a test key circuit, and attenuators, one of which can be set in steps of1 db up to a total of 90 db. Equipment Features Because of the large number of systems likely to be terminated inan office, the jacks are concentrated in a group of bays located together CABLE CARRIER TELEPHONE TERMINALS 121 for ease in patching and testing. There are in general five majordivisions of the terminal equipment consisting of channel modem bays,group modem bays, carrier supply bays, high-frequency testboard, andfour-wire voice-frequency patching board and associated voice termin-. iiiiniiiifliiiiiifiiiiiiwiwiiiiiii:iwiiiiiiininiiiii imurm
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
