Ericsson SVP 2000, Справочное руководство, Страница: 15 / 196

Introduction
- Video: 1 x SD/HD-SDI
- Audio: 8 embedded PCM stereo audio channels
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Professional Decoder based on MPEG-4 AVC Compression
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Seamless switching between incoming streams
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Simple Web-based user interface (Internet Explorer 10, Firefox, Chrome)
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Text messaging available between Encoder and Decoder
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Gige IP interface
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1RU x 19” chassis with compact form factor
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Optional SMPTE 2022-2 FEC support
1.2.2 Characteristics of an Unmanaged Network
Typically, the last mile link or DSL network offers no Quality of Service (QOS) and
has varying bandwidth capacity. It exhibits congestion limiting use for constant bit
rate (CBR) services. This results in
Congestive Packet Loss because the network
is unable to support the amount of traffic it receives. There are, also, Transmission
Bit Errors resulting from transmission channel noise, distortion, signal weakness,
bit synchronization, or attenuation.
As the available bandwidth varies over time, which could be due to a number of
reasons e.g. more people sharing the same bandwidth in fibre networks or rain fade
for Ka-band satellite services and Microwave links, the IP network exhibits
congestion.
When networks suffer congestion, this prevents the use of CBR services as the IP
network is unable to support the required bandwidth. There could also be some
transmission errors that are exhibited.
In practice, because there is a low probability of bit-error related packet loss, almost
all packet loss in terrestrial IP networks is caused by network congestion.
1.2.3 SVP 2000 Video Processor Solution
The driver for adopting this solution is either capital expenditure savings or new lines
of revenue.

High capital expenditure results from the occasional use of an expensive
Satellite uplink or an expensive high-capacity fibre link.

New lines of revenue can result from the ability to provide existing content over
cheaper links than other providers thereby enabling a viable business model.
The basic concept is to exchange video from one location to another over an
unmanaged network (generally public IP).
EN/LZT 790 0046/1 R1A 1-7