Abstract The disclosed multiplexer responds to data appearing on separate channels at different signalling speeds or bit rates. At least two sampling rates are selected. One of the sampling rates is a base rate equal to or higher than the lowest signalling speed and the other sampling rate is a multiple of the base rate equal to or higher than the fastest signalling speed. The lowest speed signals are sampled at the base rate and the higher speed signals with the higher rate. The resulting sampled data is then interleaved. The lowest bit rate occupies the normal number of slots and the higher bit rate occupies a multiple number of the low rate slots. The interleaved signals are then transmitted. To accommodate telex call-establishing signals, which may occur in the same channel at rates different from the data rate, the existance of such call-establishing signals is determined and the sampling times are adjusted. The sampled signals are regenerated into bits which are multiples of the data rate. These bits are interleaved as data. Within the multiplexer distortion is removed by regenerating the signals in each channel on the basis of the condition of the center of each bit. This is comparable to a repeater. The bit center is located by high speed sampling techniques which count to the center of each bit on the basis of predetermined programs which are preset in accordance with the expected bit rate in each channel.
A time division multiplexer for transmitting the content of bit streams of data appearing on one channel at one speed and another channel at another speed over a medium on a time-sharing basis; comprising sampling means for sampling each bit in each bit stream at a rate substantially higher than the bit streams so as to place all the bits on one line, selecting means for selecting one sample from each of the bits to regenerate the bits as sample streams, resampling means having a first portion for resampling the slower sample stream at a first rate equal to or greater than the slower sample stream and a second portion for resampling the faster sample stream at a rate which is an integral multiple of the first rate and equal to or faster than the speed of the faster sample stream, and means coupled to said resampling means for interleaving the sampled data.
Claim 2
Dependent Claim
153 words
A time division multiplexer for transmitting the content of bit streams of data appearing on one channel at one speed and another channel at another speed over a medium on a time-sharing basis; comprising sampling means for sampling each bit in each bit stream at a rate substantially higher than the bit streams so as to place all the bits on one line, selecting means for selecting one sample from each of the bits to regenerate the bits as sample streams, resampling means having a first portion for resampling the slower sample stream at a first rate equal to or greater than the slower sample stream and a second portion for resampling the faster sample stream at a rate which is an integral multiple of the first rate and equal to or faster than the speed of the faster sample stream, and means coupled to said resampling means for interleaving the sampled data.
Claim 3
Independent Claim
132 words
The method of time division multiplexing the content of bit streams of data appearing on one channel at one speed and on another channel at another speed, over a medium on a time-sharing basis; which comprises sampling each bit in each bit stream at a rate substantially higher than the bit streams so as to place all the bits on one line, selecting one sample from each of the bits to regenerate the bits as sample streams and resampling the slower sample stream at a first rate equal to or greater than the slower sample stream and resampling the faster sample stream at a rate which is an integral multiple of the first rate and equal to or faster than the speed of the faster sample stream, for interleaving the sampled data.
Claim 4
Independent Claim
132 words
The method of time division multiplexing the content of bit streams of data appearing on one channel at one speed and on another channel at another speed, over a medium on a time-sharing basis; which comprises sampling each bit in each bit stream at a rate substantially higher than the bit streams so as to place all the bits on one line, selecting one sample from each of the bits to regenerate the bits as sample streams and resampling the slower sample stream at a first rate equal to or greater than the slower sample stream and resampling the faster sample stream at a rate which is an integral multiple of the first rate and equal to or faster than the speed of the faster sample stream, for interleaving the sampled data.