Multiplex communications – Wide area network – Packet switching
Patent
1984-04-19
1986-10-07
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04J 312
Patent
active
046163611
ABSTRACT:
A digital signal multiplex device has at least one multiplexer and at least one demultiplexer for pulse frames having a number of useful information channels. The transmitter has a data protection coder and the receiver has a data protection decoder. The data protection coder generates an error protection code and inserts the error protection information into one or more of the useful information channels or into whole-numbered portions of at least one useful information channel in the pulse frame. At the receiving end, the error protection information-containing portion of the signal is supplied to the data protection decoder, which recognizes and corrects errors in all or certain of the channels of the transmitted time division multiplex signal. In this manner, all or individual ones of the useful information channels, which may be utilized for data transmission, can be transmitted with a lower bit error quota without departing from the standardized hierarchy stages of data transmission systems.
REFERENCES:
"The Design and Applications of PCM Signalling Multiplexers", by E. Blum et al., Budavox Telecomm Rev. (Hungary), #3 (1979).
"64 kbit/s Data Adaptation Unit for 2048 kbit/s PCM Terminals", by R. Trachsel, Hasler Review, vol. 12, No. 3/4, 1979.
"Multiplex Equipment DSMX64K/2 and Insertion Unit DSE64K/2 for Digital Transmission", Graf et al., Special Issue Digital Transmission, telcom report 2 (1979), pp. 45-51, 59-64.
CCITT Yellow Book, vol. III Fascicle III.3 "Digital Networks, Transmission Systems and Multiplexing Eqipment", Recommendation G.751, pp. 144-145.
"Coding for Error Correction and Error Detection," Swoboda, (1973), pp. 12-15.
"Best Fire Codes with Length up to 1200 Bits", Wagner, IEEE Transactions, IT-16 (1970), pp. 649-650.
"Advanced Mico Devices Preliminary Product Specification for Am9520 Burst Error Processor," Feb. 1981.
Olms Douglas W.
Rokoff Kenneth I.
Siemens Aktiengesellschaft
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