Transporting synchronization channel information across a packet network
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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Abstract
A technique for preserving information contained in a synchronization channel of a Time Division Multiplexing (TDM) frame across a packet network. Information contained in the synchronization channel of TDM frames is transferred over the packet network by a first gateway device that received the TDM frames. A second gateway device receives the synchronization channel information and places the information in one or more TDM frames. The TDM frames are transferred onto the TDM network.
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Citations
22 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15, 16, 17, 18, 19, 20, 21, 22)
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8. An apparatus 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 apparatus comprising:
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a TDM interface configured to receive a 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 TDM frames and a non-frame alignment signal portion containing other information that is not TDM frame synchronization information; an extractor configured to extract the other information contained in the non-frame alignment portion of the synchronization channels, the extracted other information representing other than synchronization information; and an encapsulator configured to; (a) place the extracted other information into a packet, and (b) forward the packet onto the packet network. - View Dependent Claims (9, 10, 11)
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12. An apparatus for transferring information contained in time division multiplexing (TDM) frames onto a packet network, the apparatus comprising:
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means for 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 TDM frames and a non-frame alignment signal portion containing other information that is not TDM frame synchronization information; means for 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; means for placing the extracted other information into a packet; and means for forwarding the packet onto the packet network.
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13. A system for preserving data information contained in time division multiplexing (TDM) frames received from a TDM network in packets transmitted across a packet network, the system comprising:
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a first node configured to; (a) receive 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 TDM frames and a non-frame alignment signal portion containing other information that is not TDM frame synchronization information; (b) extract other information contained in the non-frame alignment portion of the synchronization channels, the extracted other information representing information other than synchronization information; (c) place the extracted other information into a packet, and (d) forward the packet onto the packet network; and a second node configured to; (a) receive the packet, (b) extract the other information from the packet, and (c) place the extracted data other information into a synchronization channel of a second TDM frame.
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14. A computer-readable medium comprising computer-executable instructions executed by a computer for:
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receiving a plurality of time division multiplexing (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 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 packet; and forwarding the packet onto a packet network.
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Specification