Multiplex communications – Wide area network – Packet switching
Patent
1989-10-30
1991-09-24
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701101, H04J 312
Patent
active
050519883
ABSTRACT:
The present invention provides a transmission line encoding/decoding system wherein encoding is effected in such a manner that an overhead bit which indicates whether or not a slot, all the bits of which are "0" bits (hereinafter referred to as an all-"0" slot), is present among a plurality of slots constituting in combination one block and is set in a predetermined slot in the block, and if there are all-"0" slots, a slot information bit which indicates the slot position of at least one all-"0" slot is set and at least one all-"0" slot the position of which is indicated by the slot information bit is deleted, and wherein decoding is effected in such a manner that whether or not an all-"0" slot was present in one block before the encoding process is judged on the basis of an overhead bit set at a predetermined position in the block of the received data, and if it is judged that there was an all-"0" slot, the slot information bit indicating the slot position of the all-"0" slot that has been set in the received block is removed and an all-"0" slot is reconstructed at the position indicated by the slot information bit.
REFERENCES:
patent: 4742531 (1988-05-01), Blondeau, Jr. et al.
patent: 4747098 (1988-05-01), Huang et al.
patent: 4757500 (1988-07-01), Gorshe
patent: 4757501 (1988-07-01), Gorshe
Ito Shuji
Kakuno Takane
Kawahigashi Haruko
Nakano Sakae
Yoshioka Mikio
Marcelo Melvin
Mitsubishi Denki & Kabushiki Kaisha
Olms Douglas W.
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