# US 5,347,566 A · Retrofit subscriber loop carrier system with improved performance monitoring and remote provisioning > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,347,566 A - Document ID: US5347566A - Status: Granted - Kind: A - Application number: 07/781,466 - Filed: 1991-10-23 - Granted: 1994-09-13 - Earliest claimed: 1991-10-23 - Assignees: Digital Transmission Systems, Inc. - Inventors: Edward K. Law; Yick M. Chan - Web page: https://patentgrep.com/patent/US5347566A ## CPC - H04J 3/1641: {Hierarchical systems} - H04M 3/303: {and using PCM multiplexers, e.g. pair gain systems} - H04Q 11/04: for time-division multiplexing {(H04Q11/0001 takes precedence)} - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) - H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W) ## Abstract An improved subscriber line carrier (SLC) with enhanced performance for monitoring and remote provisioning. Communication between the new control unit and new channel units (such as universal remote provisionable channel unit) utilizes a back plane read disable bus line (RNDIS). Serial digital signals are modulated within a high level on the read disable bus line for transmission of information between control unit and the new channel units. ## Claims ### Claim 1 A subscriber loop carrier system for transporting a plurality of signals originating from a central office terminal to subscriber locations coupled to a remote terminal, said remote terminal comprising: a plurality of channel units for transmitting and receiving said subscriber signals; and a control unit operably coupled to said channel units, said control unit communicating control and monitoring information to and from said plurality of channel units, said control unit coupled to said channel units by a read disable bus (RNDIS), said read disable bus communicating said control and monitoring information between said control unit and said plurality of channel units by modulating a voltage level on said RNDIS bus within a predefined high voltage level. ### Claim 2 A subscriber loop carrier system for transporting a plurality of signals originating from a central office terminal to subscriber locations coupled to a remote terminal, said remote terminal comprising: a plurality of channel units for transmitting and receiving said subscriber signals, said channel units each comprising means for recognizing its physical slot location; and a control unit operably coupled to said channel units, said control unit communicating control and monitoring information from and to said plurality of channel nits, wherein each of said channel units is adapted to communicate said physical slot information to said control unit. ### Claim 3 A subscriber loop carrier system for transporting a plurality of signals originating from a central office terminal to subscriber locations coupled to a remote terminal, said remote terminal comprising: a plurality of channel units for transmitting and receiving said subscriber signals; a control unit operably coupled to said channel units, said control unit communicating control and monitoring information from said plurality of channel units; and a line interface unit also coupled to said control unit and said channel units, said line interface unit interfacing with T1 transmission lines and monitoring whether said channel unit is a single or dual channel unit. ### Claim 4 (depends on 1) The subscriber loop carrier system as recited in claim 1 wherein said system transmits said monitoring and control information over said RNDIS bus in a serial digital manner. ### Claim 5 (depends on 3) The subscriber loop carrier system as recited in claim 3 wherein said line interface unit further comprising means for communicating whether said channel unit is a single or dual channel unit to said control unit. ### Claim 6 (depends on 1) The subscriber loop carrier system as recited in claim 1 wherein said control information comprises provisioning of parameter selections for said channel units, said parameter selections include transmission level, slope equalizer, and impedance. ### Claim 7 (depends on 1) The subscriber lop carrier system as recited in claim 1 wherein said monitoring information comprises monitoring of current configuration, operating conditions, status, and inventory information of said channel units. ### Claim 8 (depends on 1) The subscriber loop carrier system as recited in claim 1 wherein said control information comprises modifying functional types of said channel units. ### Claim 9 In a remote terminal of a subscriber loop carrier system for transporting a plurality of signals originating from a central office terminal to subscriber locations which are coupled to a plurality of channel units in said remote terminal, a method for communicating control and monitoring information comprising coupling said plurality of channel units to a control unit with a read disable bus line (RNDIS), said control unit communicating control and monitoring information between said plurality of channel units and said control unit over said rad disable bus (RNDIS) by modulating a voltage level on said RNDIS bus within a defined high voltage level. ### Claim 10 (depends on 9) The method as recited in claim 9 wherein said defined high voltage level is about 2.8 to 5 volts. ### Claim 11 (depends on 9) The method as recited in claim 9 wherein said control information comprises parameter selections of said channel units, said parameter selections include transmission level, slope equalizer, and impedance. ### Claim 12 (depends on 1) The subscriber loop carrier system as recited in claim 1 wherein said defined high voltage level is about 2.8 to 5 volts. ### Claim 13 (depends on 1, 2, 9) The subscriber loop carrier system as recited in claim 1, 2 or 9, wherein said channel units comprise of channel units that can communicate said control and monitoring information over said RNDIS bus and channel units. ### Claim 14 In a remote terminal of a subscriber loop carrier system for transporting a plurality of signals originating from a central office terminal to subscriber locations, said remote terminal comprising: a control unit; a plurality of channel units for transmitting and receiving said plurality of signals, said channel units coupled to said control unit; and at least one line interface unit coupled to said control unit and said channel units, said line interface unit interfacing with a T1 transmission line and monitoring whether said channel unit is a single or dual channel unit. ### Claim 15 (depends on 14) The remote terminal as recited in claim 14 wherein said line interface unit further comprising means for communicating to said control unit whether said channel unit is a single or dual channel unit. ### Claim 16 (depends on 3, 14) The subscriber loop carrier system as recited in claim 3 or 14, wherein said channel units comprise of channel units that can communicate said control and monitoring information over said RNDIS bus and channel units that cannot communicate said control and monitoring information over said RNDIS bus.