Transmission system and multiplexing/demultiplexing equipment involving a justifiable bit stream

Multiplexing/demultiplexing equipment involving data transmitted with a first timing and a justifiable bit stream transmitted with a second timing, which equipment comprises at least a phase alignment device which has:

• an access for input data formed by bits produced at a first clock rate,
• an access for producing at the second clock rate said stream in which bits can be inserted or deleted,
• a buffer memory
• write means for writing at a write location of the buffer memory the data coming from said access for data coming in at the first rate,
• reading means for reading from a read location of the buffer memory the data stored at the second rate and for forming said stream,
• location comparing means for producing a comparison code of the read location codes with the write location codes,
• justification means for inserting and/or deleting bits in the outgoing data stream as a function of the comparison code,
• characterized in that the comparing means have:
• an interpolation element for producing intermediate values between variations of the comparison code,
• and in that the justification means have:
• a decision circuit which has a decision threshold provided for controlling a justification and whose value may be one of the intermediate values.

Phase alignment device which has:

• an access for input data formed by bits produced at a first clock rate,
• an access for producing at a second clock rate a justifiable bit stream in which bits can be inserted or deleted,
• a buffer memory
• write means for writing at a write location of the buffer memory the data coming from said access for data coming in at the first rate,
• reading means for reading from a read location of the buffer memory the data stored at the second rate and for forming said stream,
• location comparing means for producing a comparison code of the read location codes with the write location codes,
• justification means for inserting and/or deleting bits in the outgoing data stream as a function of the comparison code,
• characterized in that the comparing means have:
• an interpolation element for producing intermediate values between variations of the comparison code,
• and in that the justification means comprise:
• a decision circuit which has a decision threshold provided for controlling a justification and whose value may be one of the intermediate values.