System and method for the synchronization and distribution of telephony timing information in a cable modem network

Abstract

A method for synchronizing clocks in a packet transport network. The method comprises, receiving an external network clock at a central packet network node and transmitting timing information to a plurality of packet network devices, the timing information based upon the external network clock. The method further comprises, transmitting and receiving data that is synchronized to the timing information to a plurality of connected packet network devices. And finally, delivery of packets to an external interface via a packet network that contains data synchronized to the external network clock.

1 . A communications system, comprising:
 a cable modem termination system coupled to a plurality of communication networks;   a clock external to the cable modem termination system being synchronized to a public switched network; and   a cable modem coupled to the cable modem termination system and synchronized to the cable modem termination system.   
     
     
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