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Teleste Proprietary. All rights reserved.
Extended Spectrum DOCSIS:
A Pragmatic Approach
Arttu Purmonen, Vice President
Teleste Proprietary. All rights reserved.
Decade after decade
2
600 MHz 860 MHz 1 GHz 1.2 GHz 1.8 GHz
Teleste Proprietary. All rights reserved.
Decade after decade - From changes to solutions
3
Changes
• More bits/symbol requiring better
MER
• Higher frequencies and loads,
requiring better amplifiers
• Lower margins due to higher Total
Composite Power (TCP)
Solutions
• More robust modulation methods
and FECs
• Better amplifiers
• Digital fibre instead of analog
(shift to DAA)
• Careful network planning and
intelligent amplifiers
Teleste Proprietary. All rights reserved.
Decade after decade – A challenge of continuity
4
What has NOT changed
• Engineers complaining
that the next change is
”different”
• Distances between
existing street
cabinets
Solutions
• Time
• Better amplifiers and
careful network
planning
Questions
• How good are these
better amplifiers going
to be?
• Are booster amplifiers
needed between
street cabinets?
Teleste Proprietary. All rights reserved.
If distance between amplifiers is chosen without restraints
5
Cascading 1.8 GHz amplifiers and reaching 4K QAM can be ”trivial”
Theoretically calculated and measured results follow the 10log equation
In practice some of these amplifiers would be trunk extenders in new locations
RPD
≈0.1 dB/m @ 1.8 GHz
24 dB@1.8GHz
240 m 240 m 240 m240 m
24 dB 24 dB24 dB 24 dB
MER 50 dB MER 48 dB
CNR 60 dB
Teleste Proprietary. All rights reserved.
If distance between street cabinets is more challenging
6
Cascading 1.8 GHz amplifiers and reaching 4K QAM can be difficult
Theoretically calculated and measured results do not follow 10log (closer to 13log)
RPD
48 dB@1.8GHz
480 m 480 m
48 dB 48 dB
≈0.1 dB/m @ 1.8 GHz
MER 50 dB MER 38 dB
CNR 45 dB @ 1.8 GHz
Teleste Proprietary. All rights reserved.
Cascades & MER
7
Attenuation
between
amps ≈ gain
@1.8 GHz
Numberofamps
Gain 50 dB25 dB
2321
Teleste Proprietary. All rights reserved.
Cascades & MER
8
Attenuation
between
amps ≈ gain
@1.8 GHz
Numberofamps
4K OFDM
2K OFDM
1K OFDM
TCP≈70 dBmV
Gain 50 dB25 dB
2321
Teleste Proprietary. All rights reserved.
Summary
2. Attenuation between amplifiers guides 1.8 GHz network upgrades
1. Coax has served us well, all challenges have been solved wave by wave
3. Today, 1.8 GHz amplifiers can manage 70 dBmV TCP
4. Careful network planning and precise adjustments reduce number of new locations
• The accuracy of signal levels becomes paramount
-> Intelligent and automatic adjustments secure proper network operation
9
THANKS, contact: arttu.purmonen@teleste.com

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A pragmatic approach to Extended Spectrum DOCSIS: November 2020

  • 1. Teleste Proprietary. All rights reserved. Extended Spectrum DOCSIS: A Pragmatic Approach Arttu Purmonen, Vice President
  • 2. Teleste Proprietary. All rights reserved. Decade after decade 2 600 MHz 860 MHz 1 GHz 1.2 GHz 1.8 GHz
  • 3. Teleste Proprietary. All rights reserved. Decade after decade - From changes to solutions 3 Changes • More bits/symbol requiring better MER • Higher frequencies and loads, requiring better amplifiers • Lower margins due to higher Total Composite Power (TCP) Solutions • More robust modulation methods and FECs • Better amplifiers • Digital fibre instead of analog (shift to DAA) • Careful network planning and intelligent amplifiers
  • 4. Teleste Proprietary. All rights reserved. Decade after decade – A challenge of continuity 4 What has NOT changed • Engineers complaining that the next change is ”different” • Distances between existing street cabinets Solutions • Time • Better amplifiers and careful network planning Questions • How good are these better amplifiers going to be? • Are booster amplifiers needed between street cabinets?
  • 5. Teleste Proprietary. All rights reserved. If distance between amplifiers is chosen without restraints 5 Cascading 1.8 GHz amplifiers and reaching 4K QAM can be ”trivial” Theoretically calculated and measured results follow the 10log equation In practice some of these amplifiers would be trunk extenders in new locations RPD ≈0.1 dB/m @ 1.8 GHz 24 dB@1.8GHz 240 m 240 m 240 m240 m 24 dB 24 dB24 dB 24 dB MER 50 dB MER 48 dB CNR 60 dB
  • 6. Teleste Proprietary. All rights reserved. If distance between street cabinets is more challenging 6 Cascading 1.8 GHz amplifiers and reaching 4K QAM can be difficult Theoretically calculated and measured results do not follow 10log (closer to 13log) RPD 48 dB@1.8GHz 480 m 480 m 48 dB 48 dB ≈0.1 dB/m @ 1.8 GHz MER 50 dB MER 38 dB CNR 45 dB @ 1.8 GHz
  • 7. Teleste Proprietary. All rights reserved. Cascades & MER 7 Attenuation between amps ≈ gain @1.8 GHz Numberofamps Gain 50 dB25 dB 2321
  • 8. Teleste Proprietary. All rights reserved. Cascades & MER 8 Attenuation between amps ≈ gain @1.8 GHz Numberofamps 4K OFDM 2K OFDM 1K OFDM TCP≈70 dBmV Gain 50 dB25 dB 2321
  • 9. Teleste Proprietary. All rights reserved. Summary 2. Attenuation between amplifiers guides 1.8 GHz network upgrades 1. Coax has served us well, all challenges have been solved wave by wave 3. Today, 1.8 GHz amplifiers can manage 70 dBmV TCP 4. Careful network planning and precise adjustments reduce number of new locations • The accuracy of signal levels becomes paramount -> Intelligent and automatic adjustments secure proper network operation 9 THANKS, contact: arttu.purmonen@teleste.com