ATM line concentration apparatus

• US 5,999,532 A
• Filed: 03/10/1997
• Issued: 12/07/1999
• Est. Priority Date: 08/13/1996
• Status: Expired due to Term

• Current Assignee: Ciena Corporation
• Original Assignee: NEC Corporation
• Inventors: Terasaki, Hiroshi
• Primary Examiner(s): Pham, Chi H.
• Assistant Examiner(s): Duong, Frank
• Application Number:
  US08/814,171
• Time in Patent Office: 1,002 Days
• Field of Search: 370/395, 370/377, 370/522, 370/450, 370/533, 370/534, 370/397, 370/410, 370/420
• US Class Current: 370/395.3
• CPC Class Codes: H04L 2012/561 Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
• CPC Class Codes: H04L 2012/563 Signalling, e.g. protocols, reference model
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

An ATM line concentration apparatus includes first and second transmission path termination circuits, an ATM switch, and a signaling termination circuit. Information for execution of signaling as a procedure for establishing a switched virtual channel with respect to an ATM switching unit or a plurality of subscriber terminals in response to a call generated from the ATM switching unit or the plurality of subscriber terminals is transmitted by using the ATM switch and the signaling termination circuit through the first and second transmission path termination circuits.

Claims

1. An ATM line concentration apparatus interposed between an ATM switching unit and a plurality of subscriber terminals, comprising:

a first transmission path termination circuit;

a second transmission path termination circuit;

an ATM switch operative for connecting together and disconnecting said termination circuits, and

a signaling termination circuit connected for two way communication with said ATM switch,

wherein information for execution of signaling as a procedure for establishing a switched virtual channel with respect to said ATM switching unit or said plurality of subscriber terminals in response to a call generated from said ATM switching unit or said plurality of subscriber terminals, is transmitted through said first and second transmission path termination circuits by using said ATM switch and said signaling termination circuit.

2. An apparatus according to claim 1, wherein said first transmission path termination circuit terminates a first physical transmission path accommodated in said ATM switching unit, and

said second transmission path termination circuit includes a plurality of second transmission path termination circuits, and a plurality of third physical transmission paths connected to said plurality of subscriber terminals through said plurality of second physical transmission paths and accommodated in a plurality of ATM multiplexers for multiplexing/demultiplexing pieces of subscriber information are terminated.

3. An apparatus according to claim 2, wherein said signaling termination circuit uses information for execution of the signaling which is transmitted through the first physical transmission path or the plurality of third physical transmission paths and terminated by said first or second transmission path termination circuit so as to execute the signaling with respect to said ATM switching unit or said subscriber terminal.

4. An apparatus according to claim 2, wherein said ATM switch performs switching connection of ATM information, which is terminated by said first and second transmission path termination circuits, on an ATM cell basis by using a first switched virtual channel established with respect to said ATM switching unit by the signaling and a second switched virtual channel established with respect to said subscriber terminal by the signaling.

5. An apparatus according to claim 3, wherein said ATM switch performs switching connection of ATM information, which is terminated by said first and second transmission path termination circuits, on an ATM cell basis by using a first switched virtual channel established with respect to said ATM switching unit by the signaling and a second switched virtual channel established with respect to said subscriber terminal by the signaling.

6. An apparatus according to claim 2, wherein when the first and third physical transmission paths are to be terminated, a total transmission capacity of the plurality of third physical transmission paths connected to said plurality of ATM multiplexers is set larger than a total transmission capacity of the first physical transmission path connected to said ATM switching unit.

7. An apparatus according to claim 4, wherein when the first and third physical transmission paths are to be terminated, a total transmission capacity of the plurality of third physical transmission paths connected to said plurality of ATM multiplexers is set larger than a total transmission capacity of the first physical transmission path connected to said ATM switching unit.