The purpose of this project is to allow IP traffic over a cable (DVB-C) infrastructure.

The Client wants to reach NET2 (a computer from NET2) from NET1 (a computer from NET1). In the picture below, the upper half is physically located in one place (e.g. Central Location) and the lower half in some other physical location (e.g. Headend). These two places are connected through coaxial cable. The main idea is to be able to have IP traffic between these places.

All the IP traffic meant for NET2 is forwarded by the Central Location switch to the Ondems netBridge. This netBridge encapsulates all the IP traffic it receives into MPEG-2 TS having a specified PID (denoted N in the picture). The number N is configurable (so that it is different from all other PIDs). The output of the netBridge goes into a multiplexer that puts it together with other traffic. The multiplexer creates an MPEG-2 TS multiplex that is modulated and sent over coaxial cable to the Headend. If the multiplexer (or corresponding demultiplexer) is not already in place, its functionality could be embedded in the netBridge.

At the Headend a demultiplexer is forwarding the PID N to the Ondems netBridge, who should decapsulate the IP packets from MPEG-2 TS packets and forward them, over Ethernet, to the L3 switch. There is also incoming IP traffic from NET2 to NET1 that has to be handled by the Ondems netBridge. This traffic is treated the same way. It may also be that the MPEG-2 TS packets generated by the Headend netBridge are multiplexed with other MPEG-2 TS packets. In this case, the system needs to be completed with the corresponding multiplexer (on the Headend side) and demultiplexer (on the Central Location side).