Synchronous digital hierarchy switch system

• US 6,553,111 B1
• Filed: 10/13/1999
• Issued: 04/22/2003
• Est. Priority Date: 10/13/1999
• Status: Expired due to Term

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: 3CX Limited (3CX)
• Inventors: Wang, Chu Hong James
• Primary Examiner(s): TIEU, BENNY QUOC
• Application Number:
  US09/416,950
• Time in Patent Office: 1,287 Days
• Field of Search: 379/219, 379/220.01, 379/221.01, 379/229, 379/230, 379/93.01, 379/93.05, 379/399.01, 370/403, 370/404, 370/405, 370/424, 370/258
• US Class Current: 379/219
• CPC Class Codes: H04J 2203/006 Fault tolerance and recovery
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

There is provided a digital switch system for connecting a telephone central office with a number of subscriber lines, in which the system includes at least one central office-digital trunk interface switch which allows digital signals to be transmitted between the switch system and the central office, and a number of subscriber line interface switches which allow signals to be transmitted between the switch system and the subscriber lines, in which each of the subscriber line interface switches is connected with at least one subscriber line via at least one digital-to-subscriber line converter, and in which the central office-digital trunk interface switch and the subscriber line interface switches are connected in a ring-shaped structure.

Claims

1. A digital switch system for connecting a telephone central office with a plurality of subscriber lines, wherein said system includes at least one central office-digital trunk interface switch member allowing signals to be transmitted between said switch system and said central office, and a plurality of subscriber line interface switch members allowing signals to be transmitted between said switch system and said subscriber lines, wherein each of said subscriber line interface switch members is connected with at least one subscriber line via at least one digital-to-subscriber line converting member, and wherein said central office-digital trunk interface switch member and said subscriber line interface switch members are connected in a ring-shaped structure.

2. A switch system according to claim 1 wherein said central office-digital trunk interface switch member comprises a host access node.

3. A switch system according to claim 1 wherein said subscriber line interface switch member comprises a remote access node.

4. A switch system according to claim 1 wherein the signals are transmissible within said system at a higher rate than the rate of transmission of signals between said subscriber line interface switch member and the subscriber line(s) with which said subscriber line interface switch member is connected.

5. A switch system according to claim 4 wherein said signals are transmissible within said switch system at a rate of substantially 65 Mbps.

6. A switch system according to claim 4 wherein said signals are transmissible between said subscriber line interface switch member and said subscriber line(s) at a rate of substantially 64 kbps.

7. A switch system according to claim 1 wherein said switch system includes two central office-digital trunk interface switch members.

8. A switch system according to claim 1 wherein the direction of transmission of said signals within said switch system is adapted to be changed.

9. A switch system according to claim 8 wherein the direction of transmission of said signals within said switch system is changed when at least the or one of said central office-digital trunk interface switch member or at least one of said subscriber line interface switch members fails to function.

10. A switch system according to claim 1, wherein at least one of said subscriber line interface switch members is PCM switch.