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US 4,667,324 AGranted
Network multiplex structure
AssigneeNorthern Telecom Limited
InventorAlan F. Graves
Life of this patent
Estimating the term…
Abstract
A time-division multiplexed digital transmission system which utilizes single stage multiplexing and demultiplexing for both synchronous and/or asynchronous bit streams from tributaries of widely differing bit rates. This is achieved by bit stuffing each of the tributaries so as to establish a harmonic relationship at their channel level and then at their tributary level of all the bit streams being multiplexed.
Claims10
A digital transmission system comprising:
- means including bit stuffing means, for time-division multiplexing bit streams from a plurality of tributaries into a multiplexed bit stream;
- at least one of the bit streams from the plurality of tributaries being divisible into frames, each frame being divisible into a plurality of channels of equal bit length and hav1ng at 1east one additional overhead control bit;
- characterized by:
- the bit stuffing means inserts additional bits in each bit stream from the plurality of tributaries so that the number of bits per frame of said one bit stream in the multiplexed bit stream is an integer number of the number of bits per channel, and so that the number of bits per frame of each of the other bit streams in the multiplexed bit stream is an integer number of said number of bits per frame of said one bit stream long.
1 more element
A digital transmission system for the transmission of bit streams from a plurality of tributaries, comprising:
- means for time-division mutliplexing said bit streams into a multiplexed bit stream, at least one of the bit streams being divided into frames, each frame having m channels each n bits long and also having at least one additional control bit;
- characterized by:
- means for stuffing additional bits in said one bit stream to increase the resultant number of bits from the one stuffed frame in the multiplexed bit stream to kn, where k is a positive integer;
- means for stuffing additional bits in each of the other bit streams to increase the resultant number of bits from each of the other stuffed frames in the multiplexed bit stream to jkn, where j is a positive integer for each of the other stuffed frames.
1 more element
Dependencies are inferred from the claim text.