EP0216456A2 — Multiplex structure

Claim 1

Independent Claim 182 words

A digital transmission system comprising: means including bit stuffing means (10, 11, 12, 13, 14) for time-division multiplexing bit streams from a plurality of tributaries (DS-1, DS-1C, DS-2, DS-3) into a multiplexed bit stream; at least one (DS-1) of the bit streams being divisible into frames, each frame being divisible into a plurality of channels (m=24) of equal bit length (n= 8 ) and having at least one additional overhead control bit; characterized by: the bit stuffing means (11, 12, 13, 14) inserts additional bits (= 7 , 6, 11, 8) in each bit stream so that the number of bits per frame (kn= 200 ) of said one bit stream (DS-1) in the multiplexed bit stream is an integer number (k= 25 ) of the number of bits per channel (n), and so that the number of bits per frame (jkn=4 00 , 800, 5600) of each of the other bit streams (DS-1C, DS-2,DS-3) in the multiplexed bit stream is an integer number (j=2, 4, 28) of said number of bits per frame (kn) of said one bit stream (DS-1) long.

Claim 2

Dependent Claim 182 words

A digital transmission system comprising: means including bit stuffing means (10, 11, 12, 13, 14) for time-division multiplexing bit streams from a plurality of tributaries (DS-1, DS-1C, DS-2, DS-3) into a multiplexed bit stream; at least one (DS-1) of the bit streams being divisible into frames, each frame being divisible into a plurality of channels (m=24) of equal bit length (n= 8 ) and having at least one additional overhead control bit; characterized by: the bit stuffing means (11, 12, 13, 14) inserts additional bits (= 7 , 6, 11, 8) in each bit stream so that the number of bits per frame (kn= 200 ) of said one bit stream (DS-1) in the multiplexed bit stream is an integer number (k= 25 ) of the number of bits per channel (n), and so that the number of bits per frame (jkn=4 00 , 800, 5600) of each of the other bit streams (DS-1C, DS-2,DS-3) in the multiplexed bit stream is an integer number (j=2, 4, 28) of said number of bits per frame (kn) of said one bit stream (DS-1) long.

Claim 3

Dependent Claim 107 words

A digital transmission system as defined in claim 1 further characterized by: each of the other bit streams (DS-1C, DS-2, DS-3) is divisible into frames each frame being divisible into a plurality of channels (=48, 96, 672) of equal number of bits (n=8) as that of said one bit stream; the multiplexing means (10) includes means for sequentially multiplexing the bits on a channel length basis from each tributary to form a sub-frame (Fig.5); and the ratio of bits (=8, 16, 32, 324) from each tributary in each sub-frame being equal to the ratio of divisible channels per frame (=25, 50, 100, 700) of their respective tributaries.

Claim 4

Dependent Claim 177 words

A digital transmission system for the transmission of bit streams from a plurality of tributaries (DS-1, DS-1C, DS-2, DS-3), comprising: means (10) for time-division multiplexing said bit streams into a multiplexed bit stream, at least one of the bit streams (DS-1) being divided into frames, each frame having m (= 24 ) channels each n (= 8 ) bits long and also having at least one additional control bit; characterized by: means (11, 43) for stuffing additional bits (=7) in said one bit stream (DS-1) to increase the resultant number of bits from the one stuffed frame in the multiplexed bit stream to kn (= 200 ), where k (= 25 ) is a positive integer; means (12, 13, 14) for stuffing additional bits (=6, 11, 8) in each of the other bit streams (DS-1C, DS-2, DS-3) to increase the resultant number of bits from each of the other stuffed frames in the multiplexed bit stream to jkn (=4 00 , 800, 5600), where j is a positive integer selected for each of the other stuffed frames.

Claim 5

Dependent Claim 177 words

A digital transmission system for the transmission of bit streams from a plurality of tributaries (DS-1, DS-1C, DS-2, DS-3), comprising: means (10) for time-division multiplexing said bit streams into a multiplexed bit stream, at least one of the bit streams (DS-1) being divided into frames, each frame having m (= 24 ) channels each n (= 8 ) bits long and also having at least one additional control bit; characterized by: means (11, 43) for stuffing additional bits (=7) in said one bit stream (DS-1) to increase the resultant number of bits from the one stuffed frame in the multiplexed bit stream to kn (= 200 ), where k (= 25 ) is a positive integer; means (12, 13, 14) for stuffing additional bits (=6, 11, 8) in each of the other bit streams (DS-1C, DS-2, DS-3) to increase the resultant number of bits from each of the other stuffed frames in the multiplexed bit stream to jkn (=4 00 , 800, 5600), where j is a positive integer selected for each of the other stuffed frames.

Claim 6

Dependent Claim 35 words

A digital transmission system as defined in claim 3 further characterized by: the additional bits are stuffed contiguous to said control bit and the resultant number of bits kn is equal to (m+I)n bits (=(24+1)8).

Claim 7

Dependent Claim 85 words

A digital transmission system as defined in claim 3 further characterized by: at least one of the other bit streams (DS-1C) is asynchronous and is divided into alternative stuffed frames, each alternative frame having a nominal pn bits (=184) where p (= 23 ) is a positive integer; and the stuffing means (12) inserts additional bits in said alternative stuffed frames so that the ratio of the bits in the asynchronous bit stream to that of the one bit stream is equal to p/k (=23/25).

Claim 8

Dependent Claim 49 words

A digital transmission system as defined in claim 3 further characterized by: in said one bit stream: the number of channels per frame m=24 the number of bits per channel n=8, and the total number of bits per stuffed frame including the control bit and the additional bits kn=200.

Claim 9

Dependent Claim 121 words

A digital transmission system as defined in claim 5 further characterized by: in said one bit stream: the number of channels per frame m=24 the number of bits per channel n= 8 , and the total number of bits per stuffed frame including the control bit and the additional bits kn=200, in the one other of the asynchronous bit streams, the number of channels per frame (= 24 ), the number of bits per channel (=8) and the total numbers of bits per stuffed frame (=200) are . nominally equal to that of said one bit stream; and the total number of bits per alternative stuffed frame pn=1 84 so that the nominal ratio of the stuffed bits p:k = 6.44:7.

Claim 10

Dependent Claim 82 words

A digital transmission system as defined in claim 3 further characterized by: said one bit stream has a bit rate of 1544 kb/s and has a stuffed bit rate of 1600 kb/s which includes said additional bits; and one of said other bit streams has one of the bit rates 1544 kb/s, 3152 kb/s, 6312 kb/s, or 44736 kb/s, and stuffed bit rates of 1600 kb/s, 3200 kb/s, 6400 kb/s, or 44800 kb/s where j = 1, 2, 4, and 28 respectively.

Claim 11

Dependent Claim 44 words

A digital transmission system as defined in claim 3 in which the means for time-division multiplexing the bit streams additionally includes: a bus (15) having at least n leads, means (63) for coupling corresponding bits from each channel to corresponding leads on the bus.

Claim 12

Dependent Claim 53 words

A digital transmission system as defined in claim 9 in which the bus has an additional n+lth lead and the system additionally comprises: means (16) for coupling control signals to the n+lth lead in synchronism with the stuffed bits so as to facilitate recovery of the stuffed bits from the multiplexed bit stream.

Multiplex structure

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