Circular displays indicate the clock relationships in a familiar, analog style using an outer circle of 16 red LEDs and an inner circle of 12 green LEDs. One complete revolution of the outer circle will move the inner circle one position. These two circular displays make up the first 192 bits of the signal. The 193rd bit is the Index position shown as the yellow LED located inside the inner circle. A complete cycle of the inner display will make the yellow Index LED flash. The Index flash is a frame slip which will be registered in the counter.

Clock synchronization problems can be monitored by the CSC-100. The test signal can be shown to be fast or slow compared to the reference source. Relative jitter and wander and complete slips are shown. LEDs also indicate a "fast" or "slow" direction when the difference is so slow that it is difficult to observe. If the test set determines the two PCM sources are in complete synchronization the Index LED will light steadily and neither the Slow or Fast indicators will be on.

The CSC-100 is a simple troubleshooting instrument for checking DS1 timing and it allows for in-service usage.

Two separate DS1 receivers in the CSC-100 regenerate the clocks from the two sources. One source is used as the reference and one as the test source. The clocks are compared digitally on a cycle by cycle basis. Any difference is shown on the circular displays.

Bantam jacks are used for signal input. The instrument can be connected in a bridged or terminated mode. The test set will power on when a plug is inserted and it operates up to 4 hours on its re-chargable NiCad battery pack. An AC power supply provides continuous operation and acts as a charger.

The CSC-100 comes complete with the test set, padded case, power supply and instructions.

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