A frame alignment method and apparatus are disclosed for aligning the t.d.m. frames of tributaries, each including channel bytes synchronously multiplexed with a frame synchronizing byte, which are byte-interleaved to form overall t.d.m. frames identified by a frame synchronizing word, the tributaries having arbitrary frame phases with respect to one another. A channel counter (24) is reset in response (28) to the frame synchronizing word, and for each tributary in response (40) to the frame synchronizing byte the count of the channel counter (24) is used to determine an offset value which is stored in a memory (38). Each byte of each tributary is stored in a RAM (20) at an address determined by subtracting (44) the respective stored (38) tributary offset from the current count of the channel counter (24), whereby the tributaries are stored in the RAM (20) in a frame-aligned manner. Reading of the tributary bytes can be effected sequentially (26) or via a connection memory (46) providing a time switching function.

Frame alignment of tributaries of a t.d.m. bit stream

In a device for processing data signals, a storing part stores an input signal and the data signals included in the input signal are extracted from the storing part and the data signals are output at a desired output speed. Then, the data signal is output based on storage information of the input signal.

Device for processing data signals, method thereof, and device for multiplexing data signals

A channel synchronization control circuit is disclosed for a PCM telecommunication system in which for each group of trunks there is provided a synchronization circuit with data memories for each trunk. Each message is constituted by a plurality of digits equal to the number of trunks. Received message signals are stored in a buffer memory in which the time modification due to failure of channel synchronization can be corrected. The circuit continuously checks the channel synchronization and continuously applies such corrections as are necessary.

Synchronization circuit for a pcm-tdm exchange

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Synchronization circuit for a pcm-tdm exchange