Cisco Prisma II Hybrid Amplifier Technické informace stáhnout pdf (Strana 116)

117

Cisco investigated all reverse

technologies listed.

Cisco selected the FM approach since

this was the only technology that cost-

effectively achieved the desired system

performance.

Cisco called FM return “Wideband”.

Technology Considerations

Achieve >15 dB upstream dynamic range with DOCSIS

3.0 loading

 Amplitude Modulation (AM)

– Existing HFC receivers have limited performance

– New low-noise AM technology produces 23dB link budget at best

– “Variable” link gain

 Digital

– Can achieve 28dB link budget

– “Fixed” link gain

– However, costly approach

 Frequency Modulation (FM)

– Can achieve 28dB link budget

– “Fixed” link gain

– Simple installation (plug & play)

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Cisco Prisma II Hybrid Amplifier Technické informace Strana 116