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Transporting synchronization channel information across a packet network

  • US 7,627,004 B2
  • Filed: 05/26/2005
  • Issued: 12/01/2009
  • Est. Priority Date: 05/26/2005
  • Status: Active Grant
First Claim
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1. A method for preserving information contained in time division multiplexing (TDM) frames received from a TDM network, the information preserved in packets transmitted across a packet network, the method comprising:

  • receiving a plurality of TDM frames, each TDM frame having a synchronization channel, the synchronization channels alternating, over at least three TDM frames, between carrying a frame alignment signal portion having a synchronization pattern used to locally synchronize transfer of the TDM frames and a non-frame alignment signal portion containing other information that is not TDM frame synchronization information;

    extracting the other information contained in the non-frame alignment portion of the synchronization channels, the extracted other information representing information other than synchronization information;

    placing the extracted other information into a non-synchronization information portion of an outgoing packet; and

    transmitting the outgoing packet onto the packet network.

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