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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
First Claim
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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.

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