Virtual loop carrier system

• US 6,731,627 B1
• Filed: 11/17/1999
• Issued: 05/04/2004
• Est. Priority Date: 11/17/1998
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Gupta, Dev V., Narayan, Sriram, Yoon, David S., Claveloux, Denis, Saksena, Vikram, Ye, Wei, Nodoushani, Paiman, Monteiro, Anthony, Dravida, Subra, Hong, Kyung-Yeop
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): Lee, Timothy
• Application Number:
  US09/441,587
• Time in Patent Office: 1,630 Days
• Field of Search: 370/352, 370/355, 370/401, 370/480, 370/485, 370/489, 370/490, 370/493, 370/494, 370/465, 370/468, 370/280, 370/537, 370/540, 370/422, 370/395.1, 370/398, 370/463, 370/359
• US Class Current: 370/352
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Abstract

A loop carrier system includes a home local area network having plural telephone modules and a hub coupled to in-home telephone wiring. The telephone modules and the hub communicate voice signals over the in-home wiring in a dedicated frequency band above baseband POTS. The hub converts between voice signals and voice packets and is connected to a network access device for transferring the voice packets from the home local area network to a telecommunications network which routes the voice packets to a gateway. The gateway converts between the voice packets and a circuit format compatible with a local digital voice switch.

Claims

1. A home local area network for distributing multiple voice signals comprising:

a communications medium comprising in-home telephone wiring;

plural telephone modules coupled to the communications medium, each telephone module capable of supporting at least two phone numbers and having a transceiver for transmitting and receiving voice signals;

a hub coupled to the communications medium including a transceiver for transmitting and receiving voice signals wherein the voice signals are PCM coded signals transmitted within frames of digital bits from the hub to the modules in the downstream direction and from the modules to the hub in the upstream direction over the in-home wiring in a dedicated frequency band above baseband POTS; and

wherein the frames include communication timeslots assigned to individual modules for communication between the modules and the hub, the hub further including a packet converter circuit converting between the voice signals and voice packets and between associated call signaling and signaling packets, and a packet multiplexer for multiplexing the voice and signaling packets to provide a packet multiplex.

2. The home local area network of claim 1 wherein the downstream and upstream frames are transmitted using time division duplex transmission.

3. The home local area network of claim 1 wherein timeslots are assigned such that no two modules have the same timeslot, thereby avoiding collision.

4. The home local area network of claim 1 wherein the downstream frames include a framing field, a general control field, plural timeslots each separated by a timing field, and a guard band field.

5. The home local area network of claim 4 wherein the timeslots each include a control field, a voice payload field, and a signaling field.

6. The home local area network of claim 1 wherein the upstream frames include plural timeslots each comprising a framing field, a control field, a voice payload field, a signaling field, and a guard band field.

7. The home local area network of claim 1 wherein digital bits are transmitted using a raised cosine pulse signal modulated by a carrier signal at the center of the dedicated frequency band.

8. The home local area network of claim 1 wherein the home local area network further comprising a network access device for transferring the packet multiplex between the hub and an external network.

9. The home local area network of claim 8 wherein the network access device is an xDSL device.

10. The home local area network of claim 8 wherein the network access device is a cable modem.

11. The home local area network of claim 1 wherein power for operating the telephone modules is provided by the hub over the in-home wiring.

12. The home local area network of claim 8 wherein the hub further includes a data interface circuit for converting between data signals and data packets, and wherein the packet multiplexer multiplexes the data packets with the voice and signaling packets.

13. The home local area network of claim 1 wherein the hub further includes a switch circuit for connecting the voice signals received over the communications medium to an external network.

14. The home local area network of claim 13 wherein the switch circuit is operable to connect voice signals between at least two telephone modules.

15. In combination, plural telephone modules for converting analog voice signals to digital PCM coded voice signals coupled to a local hub over in-home telephone wiring, each telephone module capable of supporting at least two phone numbers and having a transmitter for transmitting the digital PCM coded voice signals in timeslots in an upstream direction toward the local hub and a receiver for receiving digital PCM coded voice signals over the telephone wiring from the hub in a dedicated frequency band above a baseband, the hub having a receiver for receiving said digital PCM coded voice signals from the telephone modules and converting them to packets for transmission in an upstream direction toward a network, and a receiver for receiving packets from the network and converting them to digital PCM coded voice signals for transmission in a downstream direction toward the local telephone modules.

16. The combination of claim 15 wherein the packets comprise ATM cells and the network includes an ATM network for routing the ATM cells from the local hub to a central office.

17. The combination of claim 16 further including a gateway coupled to the ATM network for converting between the ATM cells and a circuit format compatible with a local digital switch at the central office.

18. The combination of claim 17 wherein the gateway comprises an ATM switch and a call processing adjunct and wherein the call processing adjunct controls the conversion between ATM cells and the circuit format at the ATM switch.

19. The combination of claim 18 wherein the call processing adjunct communicates with the hub using a first signaling protocol and with the local digital switch using a second signaling protocol for controlling call processing.

20. The combination of claim 19 wherein the first protocol is selected from among Media Gateway Control Protocol, Session Initiation Protocol and H.323 and the second protocol is according to GR-303.