×

Method and system for hit-less switching

  • US 6,195,330 B1
  • Filed: 11/05/1998
  • Issued: 02/27/2001
  • Est. Priority Date: 11/05/1998
  • Status: Expired due to Fees
First Claim
Patent Images

1. A system for processing digital signals in a telecommunications system that allows hit-less switching between a first digital signal, in which a first payload, a first payload indicator marker and a first overhead are transported on a first channel, and a second digital signal, in which a second payload identical to the first payload, a second payload indicator marker and a second overhead are transported on a second channel, comprising:

  • a first pointer follower to receive the first signal, remove the first overhead, and forward the first payload and the first payload indicator marker;

    a second pointer follower to receive the second signal, remove the second overhead, and forward the second payload and the second payload indicator marker;

    a first elastic buffer with control circuit to receive the first payload and the first payload indicator marker, to forward the first payload indicator marker, and to forward the first payload;

    a second elastic buffer with control circuit to receive the second payload and the second payload indicator marker, to forward the second payload indicator marker, and to forward the second payload;

    a monitor circuit to measure a time delay between the first payload indicator marker and the second payload indicator marker and to adjust one of the first or second elastic buffer control circuits by the measured time delay to align the first payload indicator marker and the second payload indicator marker with each other;

    a multiplexer to receive the first payload and the second payload, to select between the first payload and the second payload, and to forward a selected payload; and

    a pointer generator to receive the selected payload, to generate a third overhead and a third payload indicator, and to include the third overhead and third payload indicator with the selected payload to create a third digital signal with a third payload identical to the first and second payloads.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×