Telephone subscriber accomodation system in a broadband network

• US 5,521,924 A
• Filed: 02/06/1995
• Issued: 05/28/1996
• Est. Priority Date: 11/30/1990
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Izawa, Naoyuki, Kakuma, Satoshi, Yoshimura, Shuji
• Primary Examiner(s): Safourek, Benedict V.
• Assistant Examiner(s): Patel, Ajit
• Application Number:
  US08/384,224
• Time in Patent Office: 477 Days
• Field of Search: 370/110.1, 370/60.1, 370/94.2, 370/85.6, 370/84, 370/58.1-58.3, 370/68, 370/94.1, 370/60, 370/82, 370/83, 370/99, 359/47, 359/115, 340/825.5, 340/825.51, 340/895.52, 375/106, 375/118, 375/25, 375/112, 375/114
• US Class Current: 370/466
• CPC Class Codes: H04L 2012/5614 User Network Interface
• CPC Class Codes: H04L 2012/5672 Multiplexing, e.g. coding, scrambling
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

On receiving voice data from a subscriber accommodated in a broadband network, a terminal adaptor separately puts the voice data in cells in 8-bit units every 125 μs separately, and transmits the cells by a remote switching unit in the broadband network to subscriber terminal equipment. The subscriber terminal equipment accommodates and processes each item of 8-bit data in 24 channels in the PCM format, puts in cells the PCM-formatted data in 24 channels, and sends the cells sequentially to a broadband network transmission line through the remote switching unit. On receiving the above described data in cells, an adaptor provided between the broadband network and an existing telephone network converts the data to the PCM transmission format, and sends them to the existing telephone network after adding a signaling bit to them.

Claims

1. A telephone subscriber accommodation system in a broadband network for accommodating telephone subscribers in a broadband network by transmitting information in cells in an asynchronous transfer mode, comprising:

a terminal adaptor unit for separately putting in cells of voice data from each of said telephone subscribers accommodated in said broadband network at every predetermined sampling cycle, and for sending the cells to said broadband network;

subscriber terminal equipment for extracting at every predetermined sampling cycle and multiplexing in an existing frame format each of voice data from a plurality of subscribers accommodated in said broadband network, and for sending said cells to said broadband network; and

a network adaptor unit provided between said broadband network and existing telephone network for extracting a signal obtained by multiplexing said voice data from the cells sent from said subscriber terminal equipment through said broadband network, converting the frame format of the signal multiplexed by the subscriber terminal equipment to a transmission format of said existing telephone network, and then sending the converted signal to said existing telephone network.

2. A telephone subscriber accommodation system in a broadband network according to claim 1, wherein

said transmission format of said existing telephone network is a PCM transmission format.

3. A telephone subscriber accommodation system in a broadband network according to claim 2, wherein

said network adaptor unit converts the signal format to the PCM transmission format of said existing telephone network and then sends the converted signal to said existing telephone network by extracting a signal obtained by multiplexing said voice data from the cells sent from said subscriber terminal equipment through said broadband network and then adding a signaling bit to said signal.

7. A telephone subscriber accommodation system in a broadband network according to claim 1, wherein

said subscriber terminal equipment is connected to a remote switching unit in said broadband network.

8. A telephone subscriber accommodation system in a broadband network according to claim 1, wherein

a plurality of said subscriber terminal equipment is provided in said broadband network.

9. A telephone subscriber accommodation system in a broadband network according to claim 1, wherein

said broadband network includes a remote switching unit connected to the subscriber terminal equipment, the remote switching unit adding a virtual channel identifier to each cell;

said subscriber terminal equipment identifies each of the cells sent by a plurality of subscribers accommodated in said broadband network using the virtual channel identifier added to each of said cells.

4. A telephone subscriber accommodation system in a broadband network for accommodating telephone subscribers in a broadband network by transmitting information in cells in an asynchronous transfer mode, comprising:

a terminal adaptor unit for separately putting in cells of voice data from each of said telephone subscribers accommodated in said broadband network at every predetermined sampling cycle, and for sending the cells to said broadband network;

subscriber terminal equipment for extracting at every predetermined sampling cycle and multiplexing in an existing frame format each of voice data samples stored in each of the cells from a plurality of subscribers accommodated in said broadband network, for putting each of said multiplexed existing frame format in cells, and for sending said cells to said broadband network; and

a network adaptor unit provided between said broadband network and existing telephone network for extracting a signal obtained by multiplexing said voice data samples from the cells sent from said subscriber terminal equipment through said broadband network, converting the format of the signal multiplexed by the subscriber terminal equipment to a transmission format of said existing telephone network, and then sending the converted signal to said existing telephone network, wherein;

said network adaptor unit puts in cells signals sent from said existing telephone network after being obtained, by multiplexing voice data in the transmission format of said existing telephone network, and sends the cells to said broadband network,

said subscriber terminal equipment isolates each sample of voice data for a plurality of subscribers accommodated in said broadband network from the cells sequentially sent by said network adaptor unit through said broadband network, puts each of isolated samples of voice data separately into a cell at each of said sampling cycles, and sends it to a plurality of subscribers accommodated in said broadband network, and

said terminal adaptor unit extracts a sample of voice data from the cells sent by said subscriber terminal equipment through said broadband network at each of said every predetermined sampling cycle, and sends said sample of voice data to subscribers accommodated in said terminal adaptor unit.

5. A telephone subscriber accommodation system in a broadband network according to claim 4, wherein

a transmission format of said existing telephone network is a PCM transmission format.

6. A telephone subscriber accommodation system in a broadband network according to claim 5, wherein

said network adaptor unit removes a signaling bit from said signal sent from said existing telephone network after being obtained by multiplexing voice data in the PCM transmission format of said existing telephone network, and then puts said multiplexed signal in a cell to be sent to said broadband network.

10. A system comprising:

a plurality of broadband subscriber units;

a plurality of terminal adapters coupled to respective broadband subscriber units, generating cells including the voice data from respective broadband subscriber units;

a broadband network coupled to the plurality of terminal adapters, including a remote switching unit receiving the cells from the plurality of terminal adapters, and including a subscriber terminal equipment coupled to the remote switching unit, receiving the cells and extracting the voice data, and generating a frame with channels corresponding to the respective broadband subscriber units, and including the voice data for the respective broadband subscriber units, and sending the frame to the remote switching unit for transmission in the broadband network;

a telephone network;

a network adaptor unit coupled between the broadband network and the telephone network, converting the frame into a format for transmission in the telephone network; and

a plurality of telephone units coupled to the telephone network, at least one of the plurality of telephone units receiving the voice data from the frame converted by the network adaptor unit.

11. A method comprising the steps of:

a) receiving a plurality of cells including voice data generated by respective terminal adaptor units coupled to respective broadband subscriber units;

b) extracting voice data from the cells;

c) generating, in a broadband network, a frame including channels, the channels including the voice data;

d) transmitting the frame through the broadband network;

e) receiving the frame in a network adaptor unit;

f) converting the frame into a format for transmission in a telephone network; and

g) receiving voice data included in the frame converted by the network adaptor unit, at one of a plurality of telephone units coupled to the telephone network.