Time division switching system for circuit mode and packet mode channels
First Claim
1. A time division digital switching system for switching channels with a predetermined rate, said channel having circuit mode channels and packet mode channels conveying useful information words with a predetermined number of bits, said system comprising:
- G first multiplexing means, each multiplexing a group of I reception channels into an outgoing multiplexed signal, G first demultiplexing means each demultiplexing an incoming multiplexed signal into a group of I emission channels, of said multiplexed signals having a recurrent frame including I useful information words assigned to said multiplexed channels, where G and I are integers greater than one; and
means for bidirectionally switching said circuit mode channels and said packet mode channels between lines carrying said incoming and outgoing multiplexed signals;
each of said first multiplexing means comprising;
means for introducing working information words into predetermined time intervals, each of the information words defining a multiframe and being included in one of I consecutive frames of said outgoing multiplexed signal words, each of said information words having said predetermined number of bits respectively assigned to said I reception channels, said incoming multiplexed signals also conveying said frames and multiframes; and
means for detecting flag/packet transitions in said packet mode reception channels to replace the working information word by a flag/packet transition indicating word in a frame of said outgoing multiplexed signal having the same rank in the multiframe as that in said packet mode reception channel in which a flag/packet transition has been detected;
said switching means comprising means receiving the working information words multiplexed in the multiframes of said outgoing multiplexed signals for detecting the transition indicating word to switch the channel having a detected transition over to a free packet mode channel in an incoming multiplexed signal.
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Abstract
The switching network included in the system is connected to circuit mode and/or packet mode mono- or multi-channel digital lines via connection modules. These modules enable the system connections to be standardized and accept thus any number of multiplexed channels in the lines and any transmission mode, namely duplex or half-duplex. The flag/packet transition in a packet mode channel is detected in a connection module and is transmitted as a particular word in a predetermined time interval of the outgoing multiplex of this module, at the same time as the address of the channel, thereby precluding the use of purpose-built links.
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Citations
17 Claims
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1. A time division digital switching system for switching channels with a predetermined rate, said channel having circuit mode channels and packet mode channels conveying useful information words with a predetermined number of bits, said system comprising:
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G first multiplexing means, each multiplexing a group of I reception channels into an outgoing multiplexed signal, G first demultiplexing means each demultiplexing an incoming multiplexed signal into a group of I emission channels, of said multiplexed signals having a recurrent frame including I useful information words assigned to said multiplexed channels, where G and I are integers greater than one; and means for bidirectionally switching said circuit mode channels and said packet mode channels between lines carrying said incoming and outgoing multiplexed signals;
each of said first multiplexing means comprising;means for introducing working information words into predetermined time intervals, each of the information words defining a multiframe and being included in one of I consecutive frames of said outgoing multiplexed signal words, each of said information words having said predetermined number of bits respectively assigned to said I reception channels, said incoming multiplexed signals also conveying said frames and multiframes; and means for detecting flag/packet transitions in said packet mode reception channels to replace the working information word by a flag/packet transition indicating word in a frame of said outgoing multiplexed signal having the same rank in the multiframe as that in said packet mode reception channel in which a flag/packet transition has been detected; said switching means comprising means receiving the working information words multiplexed in the multiframes of said outgoing multiplexed signals for detecting the transition indicating word to switch the channel having a detected transition over to a free packet mode channel in an incoming multiplexed signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification