Work Theory of PDH Multiplexer

The PDH system is based on the theory that if you have two identical clocks, each the same brand, style and everything, there is no guarantee that they will run at the exact same speed. Chances are that one of them will be slightly out of synchronization with the other. The transmitting multiplexer combines the incoming data streams, compensates for any slower incoming information, reconstructs the original data and sends it back out at the correct rates. This system allows for that slight variation in speed and corrects it during transfer to keep the system constantly running without pausing and waiting for certain slower data to arrive before sending it on. PDH simply fills in the missing bits to allow for a smooth transfer of data.

4U and 6U PDH Chassis

PDH made little provision for management of the network, and the need to fully de-multiplex a high level carrier to extract a lower level signal meant that increasing the capacity of PDH networks beyond a certain point was not economically viable. The main economic factor was the cost of the equipment required at each cross-connect point within the network where either individual channels or low-level multiplexed data streams might need to be extracted or added. It also added additional latency and increased the possibility of errors occurring, thereby reducing network reliability.

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