Newtec M6100 - 11.6 TS over IP

Newtec Proprietary
Confidentiality: Unrestricted
V1.4
120/225
Data Interfaces M6100 Broadcast Satellite Modulator
11.6 TS over IP
11.6.1 Why TS over IP
Transport stream over IP is a solution that is introduced to reduce costs and create more flexibility for
teleports and network operators. Using Ethernet interfaces provides the flexibility of sending media
files over the Internet towards the modulator.
11.6.2 IP Network Issues
Transporting time critical media files in TS over IP networks also implies the following main
challenges:
• Timing (packet order);
• Packet loss;
• Traffic jitter;
• Latency.
These challenges are solved as much as possible by using a certain TS encapsulation protocol and
setting the maximum traffic jitter and maximum buffer delay of the device.
11.6.3 TS Encapsulation into an IP Packet
Before the transport streams are sent over an IP network they must be packed into an IP packet.
The Maximum Transmission Unit (MTU) of an IP packet is set to 1500 bytes. This is done because
most TS streams pass over an Ethernet network. The limitation of the IP packet is set to avoid IP
fragmentation in the system setup.The MTU (1500) for the IP packet limits the number of TS
packets (188 bytes) that can be packed into the IP packet.
The limitation is 1500/188 bytes= maximums seven TS packets.
The following picture shows the maximum amount of TS packets packed into one IP packet.
The device automatically detects the amount of TS packets that are encapsulated in
an IP packet.