CSS-WC protocol

• CSS-WC Protocol Introduction
  • Sequence of interaction
  • Synchronising the wall clock
  • Message format
• CSS-WC Message objects
  • Example usage
  • Classes
• CSS-WC Clients
  • Using a Wall Clock Client
  • Algorithms
  • Classes
  • Functions
• CSS-WC Servers
  • Example usage
  • Classes

This package provides objects for representing messages exchanged via the DVB CSS-WC protocol and for implementing clients and servers.

The WC protocol is a simple UDP request response-protocol that enables simple clock synchronisation algorithms to be used to establish a common wall clock between a server and client.

There is a WallClockServer class providing a self contained Wall Clock server. The WallClockClient is designed to allow different algorithms to be plugged in for acting on the results of the request-response interaction to adjust a local clock object to match the Wall Clock of the server.

Modules for using the CSS-WC protocol:

• dvbcss.protocol.wc : objects for representing and packing/unpacking the protocol messages.
• dvbcss.protocol.client.wc : implementation of a client for a CSS-WC connection.
• dvbcss.protocol.client.wc.algorithm : algorithms to be used with a CSS-WC client.
• dvbcss.protocol.server.wc : implementation of a server for a CSS-WC connection.