Video, data and voice services have different requirements for transport. Data can be sent in bursts, while video requires a constant stream. IP technology was developed for data traffic where retransmission addresses data loss. Delay and jitter are non-issues for IP data. The congestion that occurs now and then is a normal state of network operation, and is actually used to control the amount of data users send to avoid severe congestion.
Network engineers have introduced priority based QoS mechanisms to accommodate more demanding services such as video, audio, voice and high bandwidth file transfers, aiming to reduce data loss and jitter characteristics. Unfortunately that this solution slows down the migration of all services to IP and the introduction of new services. Another way of solving this problem is to overprovision the capacity of the network which leads to higher CAPEX and OPEX with solutions that are not scalable.
To meet the demand for today's media content as well as future broadcast content, operators must be able to design networks capable of delivering quality of transport (QoT). This can be effectively provided by using channelized IP.
You can learn more about these challenges and QoT solutions in the article from the IPTV Magazine article from Net Insight.
Overcoming the Challenges of Video-Over-IP Transport
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