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US 4,375,681 AGranted
Protected muldem with interchangeable circuits of different data rates
AssigneeRockwell International Corporation
InventorsNed E. Abbott, Hampapur R. Keshavan, Robert J. McGuire
Life of this patent
Estimating the term…
Abstract
A muldem (100) has a monitor (101) for testing data path failures and standby data protective switching means (108, 109) providing an alternate data path in the event of a malfunction. The system accepts up to fifty-six standard low speed T1 LS lines (1.544 Mb/s), up to fourteen standard intermediate speed T2 lines (6.312 Mb/s), or any combination of T1 and T2 lines to generate to standard HS lines (44.736 Mb/s). The T1 circuitry is replaceably interchangeable with the T2 circuitry.
Claims41
A high reliability digital multiplexer comprising in combination:
- a plurality of parallel data input groups;
- high speed transmitter means multiplexing said groups for high speed serial data transmission;
- transmission means for each group comprising one of a plurality of interchangeable transmitter means having different input rates and identical output rates such that each group has a selectable data input rate according to choice of interchangeable transmitter means and such that each group transmits an identical data rate to said high speed transmitter means;
- means for monitoring data paths through said group transmission means and high speed transmitter means, comprising
- means for comparing input data on a selected path at said data input groups with corresponding data from said high speed transmitter means to detect errors, said comparing means including means, responsive to the rate of the path input data, for conditioning it for said comparing and
- monitor control means, including
- means for setting up a path to be monitored, including selecting the path, determining the rate of the data in the selected path and supplying information to said comparing means to control timing of the comparing in dependence on said determined rate, and
- means for directing the monitoring of the selected path, including supervising operation of said comparing means and responding to said comparing to conduct a test of error rate;
- and
- standby data protective switching means, responsive to said monitoring means, for providing an alternate data path around said transmission means.
7 more elements
A high reliability digital multiplexer combining protective standby data path switching with interchangeable acceptance of different data rate inputs, comprising:
- a plurality of parallel data input groups;
- a plurality of group transmit means, one for each group, interchangeably receiving low speed data and intermediate speed data, and transmitting intermediate speed data;
- high speed data transmit means multiplexing parallel intermediate speed data from said groups for serial transmission of high speed data;
- means for monitoring data paths through said group transmit means and high speed transmit means, comprising
- means for comparing input data on a selected path at said data input groups with corresponding data from said high speed transmit means to detect errors, said comparing means including means, responsive to the rate of the path input data, for conditioning it for said comparing and
- monitor control means, including
- means for setting up a path to be monitored, including selecting the path, determining the rate of the data in the selected path and supplying information to said comparing means to control timing of the comparing in dependence on said determined rate, and
- means for directing the monitoring of the selected path, including supervising operation of said comparing means and responding to said comparing to conduct a test of error rate;
- and
- standby data protective switching means, responsive to said monitoring means, for providing alternate data paths around said group transmit means and around said high speed transmit means.
7 more elements
A high reliability digital demultiplexer comprising in combination:
- a plurality of parallel data output groups;
- high speed receiver means demultiplexing serial high speed data for parallel transmission over said groups;
- reception means for each group comprising one of a plurality of interchangeable receiver means having identical input rates and different output rates such that each group receives an identical data rate from said high speed receiver means and such that each group has a selectable data output rate according to choice of interchangeable receiver means;
- means for monitoring data paths through said group reception means and high speed receiver means, comprising
- means for comparing output data on a selected path at said data output groups with corresponding data from said high speed receiver means to detect errors, said comparing means including means, responsive to the rate of the path output data, for conditioning it for said comparing and
- monitor control means, including
- means for setting up a path to be monitored, including selecting the path, determining the rate of the data in the selected path and supplying information to said comparing means to control timing of the comparing in dependence on said determined rate, and
- means for directing the monitoring of the selected path, including supervising operation of said comparing means and responding to said comparing to conduct a test of error rate;
- and
- standby data path protective switching means, responsive to said monitoring means, for providing an alternate data path around said reception means.
7 more elements
A high reliability digital demultiplexer combining protective standby data path switching with interchangeable delivery of different data rate outputs, comprising:
- a plurality of parallel data output groups;
- a plurality of data group receiver means, one for each group, interchangeably transmitting low speed data and intermediate speed data, and receiving intermediate speed data;
- high speed data receiver means demultiplexing high speed serial data for parallel transmission of intermediate speed data on said groups;
- means for monitoring data paths through said group receiver means and high speed receiver means, comprising
- means for comparing output data on a selected path at said data output groups with corresponding data from said high speed receiver means to detect errors, said comparing means including means, responsive to the rate of the path output data, for conditioning it for said comparing and
- monitor control means, including
- means for setting up a path to be monitored, including selecting the path, determining the rate of the data in the selected path and supplying information to said comparing means to control timing of the comparing in dependence on said determined rate, and
- means for directing the monitoring of the selected path, including supervising operation of said comparing means and responding to said comparing to conduct a test of error rate;
- and
- standby data path protective switching means, responsive to said monitoring means, for providing alternate data paths around said group receiver means and around said high speed receiver means.
7 more elements
A high reliability digital muldem comprising in combination:
- a plurality of parallel data input transmission groups;
- high speed transmitter means multiplexing said transmission groups for high speed serial data transmission;
- a plurality of parallel data output reception groups;
- high speed receiver means demultiplexing serial high speed data for parallel transmission over said reception groups;
- transmission means for each said transmission group comprising one of a plurality of interchangeable transmitter means having different input rates and identical output rates such that each said transmission group has a selectable data input rate according to choice of interchangeable transmitter means and such that each said transmission group transmits an identical data rate to said high speed transmitter means;
- reception means for each said reception group comprising one of a plurality of interchangeable receiver means having identical input rates and different output rates such that each said reception group receives an identical data rate from said high speed receiver means and such that each said reception group has a selectable data output rate according to choice of interchangeable receiver means;
- means for monitoring data paths through said group transmission means and high speed transmitter means and through said group reception means and high speed receiver means, comprising
- means for comparing input data on a selected path at said data input groups with corresponding data from said high speed transmitter means and for comparing output data on a selected path at said data output groups with corresponding data from said high speed receiver means, to detect errors, said comparing means including means, responsive to the rate of the path data at said groups, for conditioning it for said comparing and
- monitor control means, including
- means for setting up a path to be monitored, including selecting the path, determining the rate of the data in the selected path and supplying information to said comparing means to control timing of the comparing in dependence on said determined rate, and
- means for directing the monitoring of the selected path, including supervising operation of said comparing means and responding to said comparing to conduct a test of error rate;
- and
- standby data protective switching means, responsive to said monitoring means, for providing alternate data paths around said transmission means and said reception means.
10 more elements
A high reliability digital muldem combining protective standby data path switching with interchangeable acceptance and delivery of different data rate inputs and outputs, respectively, comprising:
- a plurality of parallel data input transmission groups;
- a plurality of parallel data output reception groups;
- a plurality of group transmit means, one for each input transmission group, interchangeably receiving low speed data and intermediate speed data, and transmitting intermediate speed data;
- a plurality of group receiver means, one for each output reception group, interchangeably transmitting low speed data and intermediate speed data, and receiving intermediate speed data;
- high speed data transmit means multilexing parallel intermediate speed data from said input transmission groups for serial transmission of high speed data;
- high speed data receiver means demultiplexing serial high speed input data for parallel transmission of intermediate speed data to said output reception groups;
- means for monitoring data paths through said group transmit means and high speed transmit means and through said group receiver means and high speed receiver means, comprising
- means for comparing input data on a selected path at said data input groups with corresponding data from said high speed transmit means and for comparing output data on a selected path at said data output groups with corresponding data from said high speed receiver means, to detect errors, said comparing means including means, responsive to the rate of path data at said groups, for conditioning it for said comparing and
- monitor control means, including
- means for setting up a path to be monitored, including selecting the path, determining the rate of the data in the selected path and supplying information to said comparing means to control timing of the comparing in dependence on said determined rate, and
- means for directing the monitoring of the selected path, including supervising operation of said comparing means and responding to said comparing to conduct a test of error rate;
- and
- standby data path protective switching means providing, responsive to said monitoring means, for alternate data path around said group transmit and receiver means and around said high speed transmit and receiver means.
10 more elements
Dependencies are inferred from the claim text.