ADSL and DSL Technologies (McGraw-Hill Series on Computer Communications)

US6868502B2 - Combination analog and digital modem - Google Patents
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Indeed, the preferred embodiments are applicable to a wide variety of digital communications systems.

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Effective date : Year of fee payment : 4. Year of fee payment : 8. A method and system for provisioning remote user data access over digital subscriber lines DSL's through connection-oriented packet networks is described. According to a preferred embodiment, DSL terminal units are directed to train at a rate that is not substantially greater than the subscribed data rate, thereby avoiding network congestion due to data rate mismatches between the DSL connection and a corresponding permanent virtual circuit PVC channel through the connection-oriented packet network. According to another preferred embodiment, the DSL units are directed to test for the maximum trainable data rate before settling to the subscribed data rate, and to communicate this information to a network operations center computer, thereby allowing the maximum allowable DSL data rate to be compared to actual client traffic usage patterns and to the client's subscribed data rate.

According to another preferred embodiment, in the event that the maximum trainable rate lies substantially below the subscribed data rate, the network operations center automatically re-provisions the permanent virtual circuit PVC channel through the connection-oriented packet network to a corresponding lower level, thereby conserving network resources. What is claimed is: 1. A method for provisioning a data connection between a client and a destination over a dedicated network having a digital subscriber line portion and a connection-oriented packet network portion, comprising the steps of:.

The method of claim 1 , said permanent virtual circuit channel being an ATM channel, said trained data rate allowing for the possibility of a marginal congestion condition upon the occurrence of data bursts between said subscribed data rate and said trained data rate, wherein said ATM channel is provisioned using relaxed congestion reduction parameters that curb the numbers of ATM cells discarded upon the occurrence of said marginal congestion condition. The method of claim 1 , said digital subscriber line portion comprising a client digital subscriber line terminal unit, a central office digital subscriber line terminal unit, and a copper facility therebetween, said method further comprising the steps of:.

The method of claim 3 , further comprising the step of, at said network operation center, recording said information related to said maximum trainable rate in a database, said database being configured to store current and historical maximum trainable rates for a plurality of client digital subscriber lines. The method of claim 5 , further comprising the step of instructing said digital subscriber line portion to train at a data rate not substantially greater than said subscribed data rate if said maximum trainable rate is greater or equal to than said subscribed data rate, whereby congestion between said digital subscriber line portion and said connection-oriented packet network portion due to data rate mismatch therebetween is substantially avoided.

The method of claim 6 , further comprising the step of instructing said digital subscriber line portion to train at a data rate equal to said maximum trainable rate if said maximum trainable rate is less than said subscribed data rate. The method of claim 7 , further comprising the step of transmitting information related to said maximum trainable rate to a network operation center. The method of claim 8 , further comprising the steps of. The method of claim 9 , wherein if said digital subscriber line portion has reset, performing the steps of:.

The method of claim 10 , wherein if said subsequent maximum trainable rate is different than the prior maximum trainable rate, performing the steps of:. A method for provisioning a permanent data connection between a client premises and a destination over an ATM network that includes an xDSL link to the client premises, comprising the steps of:. The method of claim 12 , said selected trained data rate causing the possibility of a marginal congestion condition upon the occurrence of data bursts between said subscribed data rate and said trained data rate, wherein said ATM channel is provisioned using relaxed congestion reduction parameters that curb the numbers of ATM cells discarded upon the occurrence of said marginal congestion condition.

The method of claim 13 , wherein upon a detection of a resetting of the CO DSL terminal unit, further steps are performed comprising the steps of:. The method of claim 12 , further comprising the step of, at said network operation center, recording said information related to said maximum trainable rate in a database, said database being configured to store current and historical maximum trainable rates for a plurality of client digital subscriber lines.

Method and system for reducing congestion in connection-oriented packet networks having digital subscriber line access.

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EP EPA1 en Method and system for reducing congestion in the connection-oriented packet network with a Digital Subscriber Line Access. USB1 en. EPA1 en.

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Why not share! Lastly, LECPS ; transformers — ; loop extenders , , , and ; and the associated circuitry may be disposed in a common housing Importantly, neither the client nor the end-to-end service provider is aware of the exact maximum DSL link data rate that will be permitted by the copper facilities between the client premise and the CO A typical blog combines text, images, and links to other blogs, Web pages, and other media related to its topic. Likewise, the DSL Access Multiplexer will be programmed at the CO to have certain transmission parameters, through a standard RS interface to a technician laptop computer or through a management link to the NOC. Testing of digital subscriber loops using multi-tone power ratio MTPR waveform. In addition, LECPS broadcasts the received control signals to loop extenders , , , and via line and local loops , , , and , respectively.

Provisioning system and method for auto-discovering customer premises equipment in activating xDSL. Automatic permanent virtual circuit connection activation for connection oriented networks. System and method for providing internet content using hybrid wireless and wire technologies at the end user site. USB2 en.

ADSL and DSL technologies / (Record no. 2730)

Support for quality of service and vertical services in digital subscriber line domain. Communication control method, communication control apparatus and storage medium. Systems and method for automated monitoring of availability in xDSL access networks.

System and method for providing base band voice telephony using derived voice over data technology. Application program interface for automating high speed network access ordering and provisioning processes. Method for moving network elements with minimal network outages in an active atm network.

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Editorial Reviews. From the Back Cover. Transmit high-quality data faster than ever using access to music, movies, TV shows, original audio series, and Kindle books. . He is currently a Senior Member of Technical Staff with Hill Associates, per publisher limits; Publisher: McGraw-Hill Education; 1 edition ( March This comprehensive guide shows telecommunication engineers and DSL Osborne/McGraw-Hill, - Computers - pages and DSL vendors how to quickly get a handle on ADSL and DSL technology without having to wade through technical documentation. Mcgraw-Hill Series on Computer Communications.

Methods and apparatus to provide services over integrated broadband communication systems. Telephone outlet for implementing a local area network over telephone lines and a local area network using such outlets. Local area network for distributing data communication, sensing and control signals. Conversant Intellectual Property Management Incorporated.

Apparatus and method for characterizing the transmission parameters of a transmission path for high bit rate data transmission. ATM based VDSL communication system having meta signaling for switching a subscriber between different data service providers.

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Conversant Intellectual Property Managment Incorporated. Method for moving network elements with minimal network outages in an active ATM network. Bush et al. USA en. Method and system for discarding and regenerating acknowledgment packets in ADSL communications. Automated service provisioning in combination of vertical services and digital subscriber line domains. Active isolation system and method for allowing local and remote data transfers across a common data link. KRB1 en. Likewise, for upstream DSL signals from customer premises to central office , loop extender amplifies the upstream signals to at least partially compensate for the attenuation that occurs between customer premises and loop extender Next, loop extender amplifies the upstream signal to at least partially compensate for the attenuation incurred as the upstream signal passes from loop extender over local loop to loop extender According to one embodiment, loop distance between loop extenders and is between about 5, and 7, feet.

In a preferred embodiment, the loop distance between loop extenders and is about 6, feet. As discussed in more detail below, this loop distance between multiple loop extenders disposed in series, in cascaded fashion, along a single local loop may be advantageous in that pursuant to other embodiments of the present system and method, each loop extender may be adapted with POTS loading coils.

These other embodiments may then replace conventional POTS loading coils, which are disposed about every 6, feet along a local loop to provide both POTS loading and DSL signal amplification functionality. Additional details of these other embodiments are discussed below with reference to FIG. Local loop is illustrated as having two cascaded loop extenders and coupled thereto between central office and customer premises It should be noted, however, that additional loop extenders not shown may be disposed in series between central office and customer premises so that DSL signals may be effectively transmitted over an even longer local loop by being amplified multiple times by multiple loop extenders.

As discussed further below in conjunction with FIGS. In addition, central office is configured to provide DC power to LECPS via local loop , local loop , and transformers — As discussed further below in conjunction with FIG. In addition, LECPS broadcasts the received control signals to loop extenders , , , and via line and local loops , , , and , respectively.

In one embodiment, each loop extender is assigned an IP address upon installation, so each control signal may be addressed to a specific loop extender by including the loop extender's IP address in a control signal header, for example. Lastly, LECPS ; transformers — ; loop extenders , , , and ; and the associated circuitry may be disposed in a common housing As illustrated in the FIG. COCPS is configured to perform communications, control, and diagnostic CCD operations on a loop extender via LECPS and local loops and by selecting the loop extender using the loop extender's IP address, generating control signals associated with a designated mode of loop extender operation, transmitting the control signals to the selected loop extender via LECPS and local loops and to place the selected loop extender in the designated mode of operation, and receiving signals and data from the selected loop extender via LECPS and local loops and in response to the transmitted control signals.

Processor executes loop extender management software for providing communications, control, and diagnostics functionality to a selected loop extender and generates control signals, determines an IP address of the selected loop extender, and sends the control signals to modem for transmission to the selected loop extender. Modem is coupled to transformers — via transformer and DC blocking capacitors and Transformers — are center-tapped transformers.

DC blocking capacitors and isolate transformer from DC power generated by central office power supply Modem transmits the control signals received from processor to the selected loop extender via center-tapped windings of transformers — Modem preferably transmits the control signals in the voice-frequency band. Voice-frequency band control signals are advantageously transmitted to the selected loop extender via the POTS loading coils of one or more loop extenders on the local loop without significant control signal attenuation or impairment by the POTS loading coils.

Modem may be a V. The FIG. Inductors and isolate central office power supply from high-frequency signals that may be present on local loop and Transformers — receive downstream DSL signals from the central office side of local loops and and send the downstream DSL signals onto the customer premises side of local loops and , receive upstream DSL signals from the customer premises side of local loops and and send the upstream DSL signals onto the central office side of local loops and , and receive control signals and DC power from the central office side of local loops and and send the control signals and DC power to LECPS LECPS includes a power supply for receiving the power from transformers — and providing power to loop extenders , , , and via line A positive node of power supply is coupled to a center-tapped winding of transformer via inductor and a negative node of power supply is coupled to a center-tapped winding of transformer via inductor Inductors — isolate power supply from high-frequency signals that may be present on local loops and Furthermore, LECPS includes a modem for receiving the control signals and broadcasting the control signals to loop extenders , , , and via line and local loops , , , and , respectively.

Modem receives the control signals via capacitors — and transformer Capacitors — isolate modem from DC voltages that may be present on local loops and Modem may be a standard voice frequency modem, such as a Bell , a Bell , a V.

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Loop extender of FIG. AMADC controls the state of DSL amplification circuitry switches not shown via switch control lines , , , and upon receiving the processed control signals from DCP Although four switch control lines are shown, the scope of the invention includes any number of switch control lines for controlling any number of DSL amplification circuitry switches. Control signals issued by COCPS may be based upon performance characteristics of loop extender , desired DSL signal amplification of loop extender , or local line conditions, for example.

Furthermore, in a normal state of operation, DSL amplification circuitry is electrically coupled to local loop via switches When bypass relay is activated, switches are open and DSL amplification circuitry is electrically decoupled from local loop In another embodiment of the present invention, the selection of states for DSL amplification circuitry switches via switch control lines , , , and is based upon DSL signals sampled by AMADC at locations not shown within DSL amplification circuitry via diagnostic lines DCP analyzes the sampled DSL signals to determine loop extender performance, and based upon the analyzed DSL signals, may instruct AMADC to select alternate states for DSL amplification circuitry switches via switch control lines , , , and to improve loop extender performance.

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In performing communications, control, and diagnostic operations, COCPS may place a loop extender in one of several modes of operation. Upon activation, bypass relay opens switches and electrically decouples DSL amplification circuitry from local loop A loop extender may be placed in Bypass Mode if the loop extender is not needed, malfunctioning, or is taken off line for scheduled maintenance, for example. DCP analyzes the data according to criteria specified by the control signals. For example, DCP may compute an average power, a peak power, a root-mean-square rms power, a peak-to-rms power ratio, and a power spectral density, for example.

The scope of the present invention includes other data analysis criteria well known in the art. COCPS uses the analyzed and unanalyzed data to determine performance of loop extender and to determine other loop extender configurations for maximum loop extender performance. COCPS may determine other loop extender configurations by computing adjustments to electrical elements comprising DSL amplification circuitry COCPS places loop extender in Power Analysis Mode to analyze loop extender power consumption by measuring currents and voltages at several diagnostic points in DSL amplification circuitry not shown.

For example, AMADC receives current and voltage data measured at several diagnostic points via diagnostic COCPS may use the power consumption data to remotely identify problems with loop extender circuitry performance so that technicians may be dispatched to the proper location to replace faulty equipment. The invention has been explained above with reference to specific embodiments. Other embodiments will be apparent to those skilled in the art in light of this disclosure. The present invention may readily be implemented using configurations other than those described in the embodiments above.

Additionally, the present invention may effectively be used in conjunction with systems other than the one described above. Therefore, these and other variations upon the above embodiments are intended to be covered by the present invention, which is limited only by the appended claims.

ADSL & DSL Technologies

Effective date : Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : A system for improving transmission of Digital Subscriber Line DSL signals, the system comprising: a plurality of loop extenders coupled to a plurality of local loops for amplifying upstream and downstream DSL signals transmitted over a first local loop and a second local loop selected from the plurality of local loops; and. Full Name Comment goes here. Are you sure you want to Yes No.

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