NewTek TriCaster 8000 - Manual (Page 329)

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 Disadvantages:
o Live streams that have no viewers are still consuming bandwidth.
From a provider point of view, it is possible that all of our bandwidth
could be utilized with no viewers. However, that is more theoretical
than practical.
o Some external streaming providers prefer to Pull streams, as re-
connection can performed from their end automatically if necessary.
But in many venues system administrators are very reluctant to
configure their system with an open port to have your stream Pulled
from.
18.6.3 STREAMING MEDIA PROVIDERS
Using a commercial streaming media provider (sometimes referred to as a Content
Delivery Network, or simply ‘CDN’) bypasses otherwise high-bandwidth
requirements for the encoding computer. When you have made arrangements for a
streaming media provider to distribute your stream, the encoder only needs enough
bandwidth to get a single a/v stream to the provider. All end users connect to the
provider to view the stream.
Most streaming providers have access to massive bandwidth (and often, with very
little notice, they can scale up your allotment to meet a temporary need.) Since your
local bandwidth is really only used for uploading a single stream, you can send a
high quality stream, secure in the knowledge that it will not degrade as soon as a
second viewer attempts to see it.
Hint: A helpful way to find a good streaming service provider is to ask other TriCaster
users for recommendations in NewTek’s online discussion forums.
18.6.4 OTHER RESOURCES
If you’re still struggling with the differences between Push and Pull streaming
methods, you can find lots of online resources (in addition to excellent information
available in NewTek’s user forums!)