NETWORK INTERFACE WITH CLOCK RECOVERY MODULE ON LINE CARD

摘要

A network interface for recovering timing information over packet networks has line card at the edge of a local network and a timing card separate from the line card. A physical interface time-stamps incoming timing packets based on smoothed recovered clock signals. A clock recovery module on the line card generates timing signals from the time-stamped incoming timing packets. A first phase locked generates raw clock signals from the timing signals. A second phase locked loop on the timing card generates the smoothed clock signals from said raw clock signals and applies them to the clock recovery module on the line card.

主权项

1. A network interface for recovering timing information over packet networks, comprising a line card thr location at the edge of a local network and a timing card separate from said line card,
said line card comprising:
a physical interface configured to time-stamp incoming timing packets based on smoothed recovered clock signals;a dock recovery module configured to generate timing signals from the time-stamped incoming timing packets; anda first phase locked loop configured to generate raw clock signals from said timing signals; said timing card comprising:
a second phase locked loop configured to generate said smoothed clock signals from said raw clock signals, said second phase locked loop being configured to feed said smoothed clock signals to said physical interface on said line card.