Common channel signal extraction/insertion device
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United States of America Patent
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-
May 23, 1995
Grant Date -
N/A
app pub date -
Dec 17, 1992
filing date -
Dec 19, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A common channel signal extraction/insertion device for a multiplexed digital transmission system includes a common channel signal insertion/extraction circuit instead of time switches. The common channel signal insertion/extraction circuit includes: a receiver-side speed converter memory 51A for buffering the multiplexed signal 13 received from the multiplexer circuit 3; and a transmitter-side speed converter memory 52A for buffering the common channel signals received from the common channel signal controller 7. The high-speed and the low-speed side reading and writing operations are controlled by the high-speed side controller 51C and the low-speed side controller 51D, respectively. The selector 53 selects between the common channel signals read out from the transmitter-side speed converter memory 52A and the data supplied from the digital switching channel 6, thereby obtaining the multiplexed signal 13a and outputting it to the demultiplexer 12.
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