US 4,727,536 A · Variable control and data rates in highly efficient multiplexer

Abstract

Methods and apparatuses for efficiently allocating bandwidth to data, control and multiplexer overhead and for providing flexible data rates and control rates are provided. The apparatuses of the invention are used in a time division miltiplexer which multiplexes for transmission over and for receipt from at least one aggregate line in accord with at least one frame, data and control information from a plurality of channels and multiplexer overhead information. The method comprises: determining the requested data transmission rates for each data channel and the aggregate line; determining the requested control transmission rates for each data channel; summing the total of the requested data transmission rates to produce a second total, summing the first and second totals, determining whether the sum of the first and second total exceeds the determined transmission rate of the aggregate line, decreasing the data rate channel thereby changing the first total to ensure that the aggregate line rate is at least equal to the sum of the first and second total.

Claims28

Dependent claims

In a time division multiplexer which multiplexes for transmission over and for receipt from at least one aggregate line in accord with at least one frame data and control information from a plurality of channels and multiplexer overhead information, an apparatus for determining the data rates to be allocated to the data and controls of said channels and to the said multiplexer overhead, and for permitting said data channels to run at said allocated data rates, said apparatus comprising:

(a) means for determining the requested data transmission rates for each of said data channels and said aggregate line;
(b) means for determining the requested control transmission rates for each of said data channels;
(c) summation means for summing the total of said requested data transmission rates to produce a first total, for summing the total of said requested control transmission rates and said overhead signal rates to produce a second total, and for summing said first and second totals;
(d) comparison means for determining whether the sum of said first and second totals exceeds the determined transmission rate of said aggregate line;
(e) means for decreasing the data rate allocated to at least one data channel thereby changing said first total, to ensure that said aggregate line transmission rate is at least equal to the sum of said first and second totals;
and
(f) means for setting the average rate of one of a group of clocks comprising a transmit and a receive clock of at least one of said channels equal to the requested data transmission rates of that channels decreased by rates dictated by said means for decreasing the allocated data rate.

4 more elements

In a time division multiplexer which multiplexes in accord with at least one frame for transmission over and for receipt from at least one aggregate line data and control information from a plurality of channels and multiplexer overhead information, wherein a channel rate is decreased to a rate other than a rate originally assigned to it, an apparatus for setting the average rate of one of a group of clocks comprising a channel receive clock and a channel transmit clock equal to said rate other than the assigned rate, said apparatus comprising:

(a) an up-down counter controlled by said frame and said one of a group of clocks, the up-down counter counting up when a select for the channel is received from said frame, and counting down when clock pulses from said one of a group of clocks are received;
and
(b) means, when said up-down counter reaches a lower threshold, for reducing the clock rate of a channel whose data rate has been decreased to a rate other than was originally assigned to it but whose clock rate is set equal to the requested data rate.

In a time division multiplexer which multiplexes for transmission over and for receipt from at least one aggregate line in accord with at least one frame, data and control information from a plurality of channels and multiplexer overhead information, an method for determining the data rates to be allocated to the data and controls of said channels and to the said multiplexer overhead, and for permitting said data channels to run at said allocated data rates, said method comprising:

(a) determining the requested data transmission rates for each of said data channels and said aggregate line;
(b) determining the requested control transmission rates for each of said data channels;
(c) summing the total of said requested data transmission rates to produce a first total;
(d) summing the total of said requested control transmission rates and said overhead signal rates to produce a second total;
(e) determining whether the sum of said first and second totals exceeds said aggregate line transmission rate;
(f) decreasing, for at least one data channel, the data rate allocated to said at least one data channel if said sum of said first and second totals exceeds said aggregate line transmission rate, thereby changing said first total, until said aggregate line transmission rate is at least equal to said sum of said first and second totals;
(g) setting the average rate of one of a group of clocks comprising a transmit and a receive clock of at least one of said channels equal to the determined requested data transmission rates of that channel decreased by rate dictated by said step (f).

4 more elements

Dependencies are inferred from the claim text.

Variable control and data rates in highly efficient multiplexer

Life of this patent

Variable control and data rates in highly efficient multiplexer

Life of this patent

Abstract

Claims28