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Anga 2013 v2
1.
Brady Volpe
2.
Massive Traffic Growth
The “terabyte club” will reach 6 million by 2015 There will be over 20 million households generating half a terabyte per month in 2015 -‐Cisco Visual Networking Index: Forecast and Methodology, 2010-‐2015 • Need: 1 Gbps bi-‐direcHon pipe in five years • Need more digital – Less Analog :: No Analog! © The Volpe Firm ConfidenHal 2
3.
Digital vs. Analog
© The Volpe Firm ConfidenHal 3
4.
Simple Headend Best
PracHces • Separate amplificaHon for analog & digital • No amplificaHon for DOCSIS • No amplificaHon for AGC pilot signals !! ▫ Lose pilot – lose plant & DOCSIS • Minimize combining & cable runs ▫ eQAMs & dense CMTSs will have low output power • Do use forward path monitoring on QAMs © The Volpe Firm ConfidenHal 4
5.
Analog Impairments •
For each 1 dB increase in system carrier levels: • CTB raHo degrades by 2 dB • CSO raHo degrades by 1 dB • CNR improves by 1 dB © The Volpe Firm ConfidenHal 5 CTB CSO Noise Floor Visual carriers Aural carriers
6.
Digital DistorHons –
CIN & CCN • For each 1 dB increase in system carrier levels: ▫ CNR behaves as before with all-‐analog operaHon ▫ CIN raHo degrades by 1 to 2 dB (mix of 2nd & 3rd order) ▫ CCN raHo degradaHon depends on CIN and CNR values ▫ See ANSI/SCTE 17 2007 © The Volpe Firm ConfidenHal 6 Thermal noise CCN CIN Visual carrier Aural carrier QAM Channels
7.
Sweep ©
The Volpe Firm ConfidenHal 7 Standing Waves Roll off at band edges Misalignment
8.
Space Between QAM
Channels Small © The Volpe Firm ConfidenHal 8 No Sweep Points 8 MHz BW No Sweep Points 8 MHz BW • One sweep point every 8 MHz • No sweep points under QAM • A lot can happen between QAM channels!
9.
Some Examples ©
The Volpe Firm ConfidenHal 9 Loose seizure screw on amplifier Corrosion on seizure screw in amplifier causes standing wave • Suckouts, standing waves, LTE, and other impairments more difficult with standard sweep
10.
Sweepless Sweep –
How it Works • Compares headend levels to outside plant levels • No sweep injecHon signals (non-‐interfering) • Less expensive, no headend unit, just meter © The Volpe Firm ConfidenHal 10
11.
Sweepless Sweep ©
The Volpe Firm ConfidenHal 11
12.
Sweepless Sweep System
Problems © The Volpe Firm ConfidenHal 12
13.
Digital Levels •
Cable Modem or Set Top Box ▫ Ideal Downstream RF Input: 60 dBuV (0 dBmV) ▫ Recommended RF Input: 55 – 65 dBuV (±5 dBmV) ▫ Worse Case RF Input: 50 – 70 dBuV (±10 dBmV) ▫ Never exceed total power: 90 dBuV (30 dBmV) • Too high or too low causes receiver demod issues • Recommended Tx levels for opHmum CNR: ▫ 100 – 110 dBuV (40 – 50 dBmV) © The Volpe Firm ConfidenHal 13
14.
Summary • Cable
networks are moving from analog to digital • CTB, CSO, etc. turn into noise (CIN) • Sweep systems may need to be upgraded • Correct digital levels at end devices are criHcal ▫ May require new test equipment • It’s a great Hme to be in cable! © The Volpe Firm ConfidenHal 14
15.
© The Volpe
Firm ConfidenHal 15 Brady Volpe brady.volpe@volpefirm.com
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