Adaptive clock recovery

Details Adaptive clock recovery Adaptive clock recovery

2003-08-22

2008-08-12

Pezzlo, John (Department: 2619)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S412000, C370S395620

Reexamination Certificate

active

07411970

ABSTRACT:
A method of recovering a clock signal for a TDM output from packets of TDM data which have been transmitted over a packet network, from a source having a source TDM clock to a destination having a destination TDM clock. The method includes providing at least some packets with a Remote Time stamp representing the state of the source TDM clock when the packet is created; providing said at least some packets with a Local Timestamp representing the state of the destination TDM clock when the packet is received; determining a Transit Time value representing the difference between said Local and Remote Timestamps; and controlling the clock frequency of the TDM output on the basis of said Transit Time as determined above.

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