Docsis r-phy without ptp

Abstract

Synchronizing clocks across a Remote PHY network without use of the Precision Time Protocol (PTP). The clock used by the CCAP core may be referred to herein as a slave clock, while the clock used by each RPD may be referred to as a master clock. Time differences between each master clock and a slave clock in the Remote PHY network are tracked. Slave clocks at the core may, but need not, lock to a single RPD master clock. A CCAP core tracks differences in clock values between a singular CCAP core clock and one or more RPD clocks using clock values identified by received DEPI Latency Measurement (DLM) packets and not using Precision Time Protocol (PTP) protocol. The CCAP core determines a particular RPD clock value to use in sending a map message to a particular RPD. The CCAP core then sends a map message to the particular RPD over the network based on the determined particular RPD clock value.