On Thu, Jun 16, 2005 at 02:10:10PM +0400, Manu Abraham wrote: > Is service_id supposed to be unique in a bouquet too ? or is it only in > a transponder ? ETSI TR 101 211 says (4.1.1 Network Information Table (NIT) information): "The SI uses two labels related to the concept of a delivery system, namely the network_id and the original_network_id. The latter is intended to support the unique identification of a service, contained in a TS, even if that TS has been transferred to another delivery system than the delivery system where it originated. A TS can be uniquely referenced through the path original_network_id/transport_stream_id. A service can be uniquely referenced through the path original_network_id/transport_stream_id/service_id. The network_id, thus, is not part of this path. In addition each service_id shall be unique within each original_network_id. When a service (contained inside a TS) is transferred to another delivery system, only the network_id changes, whereas the original_network_id remains unaffected." However, in practise you cannot rely on this. Johannes
