10,000 subscribers a package of 100 standard definition (SD) IP broadcast TVchannels. If we assume that the provider is using H.264 to compress thechannels, this generally translates to a bandwidth requirement of at least2 Mbps for each broadcast channel. In the scenario where at least onesubscriber is accessing each channel at a particular instance in time then theNext Generation Network (NGN) core distribution network will require200 Mbps of bandwidth capacity. This is the bandwidth requirement from theIPTV data center to each of the regional offices. At these offices techniquessuch as IGMP snooping can be used to reduce the bandwidth required overthe local access section of the network. Note that H.264 and 1GMP will bedescribed in greater detail later in the book.
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