Low cost ISDN/pots service using ATM

Details Low cost ISDN/pots service using ATM Low cost ISDN/pots service using ATM

1995-08-17

2001-09-18

Kizou, Hassan (Department: 2662)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S439000

Reexamination Certificate

active

06292486

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to communication systems and in particular to a method and apparatus for providing asynchronous transfer mode (ATM) signals, integrated circuit digital network (ISDN) signals and voice signals to a subscriber using unshielded twisted pair wires.
BACKGROUND TO THE INVENTION
Asynchronous transfer mode (ATM) transmission systems which carry voice and other forms of isochronous data requires the use of complex and expensive ATM adaptation layer type 1 (AAL-1) segmentation and reassembly processors. This requires that the two ends of a transmission path should communicate timing information so that they can recover from network-induced delays and delay variance in the transmission path. This requires the use of complex digital phase-locked loops and protocols that have not been fully finalized or proven, or proprietary systems.
In addition, AAL-1 is not compatible with billions of dollars worth of installed telephone networking equipment and cannot be deployed without massive and expensive network changes.
For short transmission distances, such as between a subdivision pedestal and a home, or between a PBX and a desk, these complex and expensive protocols are uneconomical compared to existing wire-line solutions that use non-ATM techniques.
SUMMARY OF THE INVENTION
The present invention provides a method and means for re-using the existing unshielded wire pairs between the pedestal and a home, or between a PBX and a desk, while preserving the legacy voice or ISDN services which would otherwise be displaced from these wire pairs, and at the same time providing ATM services to the subscriber. This helps prevent a disruptive and costly rewiring of an office building or home when ATM services are to be provided.
The present invention thus provides ATM services, and telephone voice service or basic rate ISDN service on the same unshielded pair wiring without using AAL-
1
protocols, and without obsoleting existing equipment. It is also simple to install and low cost.
Briefly, the invention combines ISDN and telephone service with new ATM services by taking advantage of the timing characteristics of SONET/ATM links and using bytes that would be unallocated, in the pedestal to subscriber interface link, in the SONET protocol overhead bytes to carry the ISDN and telephone channels.
In accordance with an embodiment of the invention, a method of providing broadband communication services to a subscriber is comprised of receiving a TDM signal including ISDN data and a channel for at least one voice data signal, receiving ATM signals having a SONET protocol which is comprised of overhead data and payload data, inserting at least one of the ISDN data or voice data into the overhead data to provide a modified ATM signal, and transmitting the modified ATM signal to subscriber equipment over unshielded twisted pair wires.
In accordance with another embodiment, a method of providing broadband communication services to a subscriber is comprised of providing first broadband services from a central office via an ATM link to a neighborhood pedestal system, providing time division multiplex (TDM) services including voice communication services from the central office via a TDM link to the neighborhood pedestal system, providing a SONET-ATM communication link from the neighborhood pedestal system over two unshielded pair of twisted wires to a user-to-network interface (UNI) at a subscriber location, and providing ATM services over the SONET-ATM communication link and providing integrated services digital network (ISDN) or voice services within a SONET-ATM data frame using timing of the SONET-ATM communication link, to the UNI, whereby ATM, and ISDN or voice services are provided between the neighborhood pedestal system and the subscriber location over the unshielded wires.
In accordance with another embodiment, apparatus for providing broadband communication services to a subscriber is comprised of apparatus for receiving a TDM signal including ISDN data or at least one voice data signal, apparatus for receiving ATM signals having a SONET protocol comprised of overhead data and payload data, apparatus for inserting at least one of the ISDN data or voice data signal into the overhead data to provide a modified ATM signal, and apparatus for transmitting the modified ATM signal to subscriber equipment over unshielded twisted pair wires.


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G.-H Im, et al., “51.84 Mb/s 16-CAP ATM LAN Standard”. IEEE, May 1995.*
Lee Goldberg, “A Blend of LAN and VAN Technologies Yields A Low-Cost Chip Set Which Delivers Video, Telephony and High-Rate ATM over Twisted-Pair Copper Telephone Lines”, Electronic Design/Oct. 1995.

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