Communication server apparatus using frequency multiplexing and method

• US 5,781,617 A
• Filed: 01/10/1997
• Issued: 07/14/1998
• Est. Priority Date: 03/29/1996
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: NetSpeed, Inc. (Cisco Systems, Inc.)
• Inventors: Ham, Ronald E., McCullough, Jason, Sisk, James R., Hall, Clifford L., Locklear, Robert H. Jr., McHale, John F.
• Primary Examiner(s): CHAWAN, SHEELA C
• Application Number:
  US08/781,482
• Time in Patent Office: 550 Days
• Field of Search: 379/93.14, 379/93.15, 379/93.28, 379/93.29, 379/93.31, 379/90.01, 379/93.01, 379/93.07, 379/93.08, 379/93.09
• US Class Current: 379/93.14
• CPC Class Codes: H04L 12/2856 Access arrangements, e.g. Internet access asynchronous transfer mode networks H04L12/5601; broadband local area networks H04L12/2801; optical access or distribution networks H04Q11/0067; access to open networks H04L12/5691; digital subscriber line end-user equipment and bit-level processing of data on a PSTN-based network H04M11/00; home network gateways H04L12/2834; wireless access networks H04W
• CPC Class Codes: H04L 12/2874 Processing of data for distribution to the subscribers
• CPC Class Codes: H04L 12/2889 Multiservice, e.g. MSAN
• CPC Class Codes: H04L 12/4612 LAN interconnection over narrowband networks, e.g. N-ISDN, PSTN, X.25
• CPC Class Codes: H04L 12/5692 Selection among different networks
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04M 11/06 Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
• CPC Class Codes: H04M 11/062 using different frequency bands for speech and other data
• CPC Class Codes: H04Q 11/0421 Circuit arrangements therefor
• CPC Class Codes: H04Q 2213/13003 Constructional details of switching devices
• CPC Class Codes: H04Q 2213/1302 Relay switches
• CPC Class Codes: H04Q 2213/13036 Serial/parallel conversion, parallel bit transmission
• CPC Class Codes: H04Q 2213/13039 Asymmetrical two-way transmission, e.g. ADSL, HDSL
• CPC Class Codes: H04Q 2213/1304 Coordinate switches, crossbar, 4/2 with relays, coupling field
• CPC Class Codes: H04Q 2213/13093 Personal computer, PC
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13109 Initializing, personal profile
• CPC Class Codes: H04Q 2213/1319 Amplifier, attenuation circuit, echo suppressor
• CPC Class Codes: H04Q 2213/13196 Connection circuit/link/trunk/junction, bridge, router, gateway
• CPC Class Codes: H04Q 2213/13199 : Modem, modulation
• CPC Class Codes: H04Q 2213/13203 : Exchange termination [ET]
• CPC Class Codes: H04Q 2213/13204 : Protocols
• CPC Class Codes: H04Q 2213/13213 : Counting, timing circuits
• CPC Class Codes: H04Q 2213/1329 : Asynchronous transfer mode, ATM
• CPC Class Codes: H04Q 2213/13292 : Time division multiplexing, TDM
• CPC Class Codes: H04Q 2213/13299 : Bus
• CPC Class Codes: H04Q 2213/13302 : Magnetic elements
• CPC Class Codes: H04Q 2213/1332 : Logic circuits
• CPC Class Codes: H04Q 2213/13322 : Integrated circuits
• CPC Class Codes: H04Q 2213/1334 : Configuration within the switch
• CPC Class Codes: H04Q 2213/13349 : Network management
• CPC Class Codes: H04Q 2213/13389 : LAN, internet

Abstract

A communication server (58) includes a plurality of pairs of frequency agile modulators (638) and demodulators (640) each set to operate at a unique frequency and associated with a twisted pair data line (54). The communication server (58) also includes a plurality of pairs of demodulators (644) and modulators (646) that each have a designatable operation frequency and are associated with one of a plurality of XDSL modems (648). A mixer (642) operates to combine signals from the frequency agile modulators (638) and provide the combined signal to the demodulators (644). The mixer (642) further operates to combine signals from the modulators (646) and provide the combined signal to the frequency agile demodulators (640). A detector (634) operates to detect a need for data service on a selected twisted pair data line (54). The controller (636) then operates to couple the selected twisted pair data line (54) to the selected XDSL modem (648) by designating the demodulator (644) and modulator (646) pair associated with the selected XDSL modem (648) to operate at the unique frequency of the frequency agile modulator (638) and demodulator (640) associated with the selected twisted pair data line (54).

Claims

1. A communication server coupled to a plurality of twisted pair data lines, each twisted pair data line coupled to an associated twisted pair subscriber line by a splitter, the communication server comprising:

a plurality of pairs of receiver/buffers and transmit/buffers coupled to associated twisted pair data lines;

a plurality of pairs of frequency agile modulators and demodulators, each frequency agile modulator and demodulator pair coupled to an associated receiver/buffer and transmit/buffer pair, and each frequency agile modulator and demodulator pair set to operate at a unique frequency;

a plurality of pairs of demodulators and modulators, each demodulator and modulator pair having a designatable operation frequency;

a plurality of XDSL modems each coupled to an associated demodulator and modulator pair;

a mixer coupled to the pairs of frequency agile modulators and demodulators and coupled to the pairs of demodulators and modulators, the mixer operable to combine signals from the frequency agile modulators and provide the combined signal to the demodulators, and the mixer further operable to combine signals from the modulators and provide the combined signal to the frequency agile demodulators;

a detector operable to detect a need for data service on a selected twisted pair data line; and

a controller coupled to the detector and to the pairs of demodulators and modulators, the controller operable to select one of the XDSL modems in response to detecting the need for data service, the controller further operable to couple the selected twisted pair data line to the selected XDSL modem by designating the demodulator and modulator pair associated with the selected XDSL modem to operate at the unique frequency of the frequency agile modulator and demodulator associated with the selected twisted pair data line.

2. The communication server of claim 1, wherein the communication server is located at a cable system operator.

3. A method for coupling a selected subset of a plurality of twisted pair subscriber lines to a plurality of XDSL modems, the method comprising:

splitting each twisted pair subscriber line into a twisted pair data line and a twisted pair phone line;

for each twisted pair data line, modulating signals received on the twisted pair data line at a unique frequency associated with the twisted pair data line;

mixing the modulated received signals to produce a combined incoming signal;

for each XDSL modem, demodulating the combined incoming signal at a designated frequency associated with the XDSL modem and modulating outgoing signals at the designated frequency;

mixing the modulated outgoing signals from the XDSL modem to produce a combined outgoing signal;

for each twisted pair data line, demodulating the combined outgoing signal at the unique frequency associated with the twisted pair data line to recover signals for transmission on the twisted pair data line;

detecting a need for data service on a selected twisted pair data line;

selecting one of the XDSL modems in response to detecting the need for data service; and

coupling the selected XDSL modem to the selected twisted pair data line by setting the designated frequency associated with the XDSL modem to the unique frequency associated with the selected twisted pair data line.

4. The method of claim 3, wherein detecting comprises coupling, in succession, a detector to the twisted pair data lines.

5. The method of claim 3, wherein detecting comprises coupling one of a plurality of detectors to each of the twisted pair data lines.