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Clock Recovery
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Clock Recovery

9463

Description

The Clock Recovery provides training in the technique of recovering clock (or bit timing) signals from baseband data signals. The Clock Recovery module provides a recovered clock signal for the Model 9462 T1/CEPT PCM Transceiver.

The module has two modes of operation. The analog mode permits recovery of a clock signal at a fixed frequency of 1.544 MHz. It uses a band-pass filter with a very sharp frequency response.

The digital mode of operation is based on a digital PLL. A local clock oscillator drives a digital divider that resets to zero whenever a transition occurs in the input data. The frequency of operation of this circuit is variable between 0.2 and 20 MHz. The digital divider division ratio can be adjusted to 8, 16, 32 or 64 counts. This feature allows the reduction of jitter to be observed as the number of counts is increased.

The module has an input for the data signal and outputs for the local and recovered clocks. Seven test points and eight fault insertion switches are also provided on the module. All inputs and outputs are fully protected against erroneous connections.


Clock Recovery
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