SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off...

12
SmartScan™ Finding Problems between TAP and the Home Rob Flask

Transcript of SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off...

Page 1: SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off Resonant Frequency absorption Validate tap performance Min analog Video Ch 2-78 15.6dBmv

SmartScan™

Finding Problems between

TAP and the Home

Rob Flask

Page 2: SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off Resonant Frequency absorption Validate tap performance Min analog Video Ch 2-78 15.6dBmv

© 2009 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION 2

Finding issues between the TAP and the Home

Technician needs to perform an adequate set of

tests at the TAP to show that the performance is

not meeting specification. • Proper Levels

• Peak to Valley

• Performance of any offending service

SmartScan™ Helps find Issues

SmartScan™ Technology is Patent Pending

Page 3: SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off Resonant Frequency absorption Validate tap performance Min analog Video Ch 2-78 15.6dBmv

© 2009 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION 3

TAP

Drop Cable

House

TV

GROUND

BLOCK

CABLE MODEM

TV

2-Way Splitter

Splitter 3-Way

STB

Courtesy of JDSU

55.25 MHz 745.25 MHz

Low end roll off High end roll off

Resonant Frequency

absorption

Validate tap performance

Min analog Video

Ch 2-78 15.6dBmv

Min QAM

Ch 79-158 8.75 dBmV

1000 MHz system

AMP

1

x

x

x

x

x

x

AMP

2

Tilt and power levels change from TAP to TAP

Mechanical issues cause customer problems

Power Levels must be

maintained for high

frequency losses

Page 4: SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off Resonant Frequency absorption Validate tap performance Min analog Video Ch 2-78 15.6dBmv

© 2009 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION 4

SmartScan™ - Finds RF problems at tap

Finds RF response issues that are out

of spec

Compares against existing limit set plus

peak to valley and max/min tilt

(the peak to valley limit is labeled drop check in the limit set

during this beta version)

Automatically Tilt Compensates and

Normalizes analog and digital

measurements to identify Peak to Valley

issues

Identifies tilt level at tap

SmartScan will be optional upon final release

SmartScan Technology is Patent Pending

Page 5: SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off Resonant Frequency absorption Validate tap performance Min analog Video Ch 2-78 15.6dBmv

© 2009 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION 5

If systems were flat!

Tight limit bands would be a simple solution

Ideal Case

-20

-15

-10

-5

0

5

10

15

20

50 150

250

350

450

550

650

750

850

950

Freq (MHz)

Le

ve

l (d

Bm

V)

Ideal TV

Typ

IdealHLimit

IdealLowLimit

Digital Tiers Analog tiers

Page 6: SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off Resonant Frequency absorption Validate tap performance Min analog Video Ch 2-78 15.6dBmv

© 2009 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION 6

In real systems – tilt happens!

Tilt Affects Limits

-20

-15

-10

-5

0

5

10

15

20

50 150

250

350

450

550

650

750

850

950

Freq (MHz)

Level

(dB

mV

)

Ideal TV

Typ

PosTilt

NegTilt

IdealHLimit

IdealLowLimit

Page 7: SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off Resonant Frequency absorption Validate tap performance Min analog Video Ch 2-78 15.6dBmv

© 2009 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION 7

SmartScan™ Eliminates Interpretation issues

and solves problems

Differences in power levels between analog and digital

carriers may be difficult to interpret for a technician

Tilt isn’t easily known

– Techs can’t input tilt value to compensate

– Wider limits allow bad channels to pass

Adjacent channel comparisons don’t find all problems

– Different digital carriers can be intermixed with analog carriers

– Roll-off can happen across many channels

Applying “Freq Bands” is still affected by tilt and allows bad

channels to pass

Page 8: SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off Resonant Frequency absorption Validate tap performance Min analog Video Ch 2-78 15.6dBmv

© 2009 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION 8

New approach to find issues

Goal is to find network issues that affect customers

– Suckouts

– Bad Channels

– Bad passives (Tap Plates, 750 MHz splitters, etc)

Provide Tech with a view that eliminates tilt

Provide Tech with a view that “compensates” for

channel type

Tighter limit set for tilt and channel compensated

view

Page 9: SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off Resonant Frequency absorption Validate tap performance Min analog Video Ch 2-78 15.6dBmv

© 2009 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION 9

How do we make this Better?

Step 1: Compensate for Tilt

Compensate for Tilt

-20.0-15.0

-10.0-5.00.0

5.010.015.0

20.025.0

50 150

250

350

450

550

650

750

850

950

Freq (MHz)

Level

(dB

mV

)

Typ

PosTilt

NegTilt

SmartScan™ Automatically calculates tilt and compensates for system tilt

Page 10: SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off Resonant Frequency absorption Validate tap performance Min analog Video Ch 2-78 15.6dBmv

© 2009 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION 10

How do we make this better?

Step 2: Compensate for different channel types

Compensate for Channel Type

-20.0-15.0

-10.0-5.00.0

5.010.015.0

20.025.0

50 150

250

350

450

550

650

750

850

950

Freq (MHz)

Level

(dB

mV

)

Typ

Channel Comp

SmartScan™ automatically normalizes carriers based on ch. type trends

e.g. QAM 64 measure -8dB below analog, etc.

Page 11: SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off Resonant Frequency absorption Validate tap performance Min analog Video Ch 2-78 15.6dBmv

© 2009 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION 11

How do we make this better?

Step 3: Normalize and provide tighter limit bands

Normalize And Peak/Valley Limits

-20.0

-15.0

-10.0

-5.0

0.0

5.0

10.0

15.0

20.0

25.0

1 3 5 7 9 11 13 15 17 19

Freq (MHz)

Devia

tio

ns i

n d

Bm

V

Normalized

High Limit

Low Limit

SmartScan™ provides a normalized view so individual

channel issues and system problems are easily identified

Page 12: SmartScan™ · STB Courtesy of JDSU 55.25 MHz 745.25 MHz Low end roll off High end roll off Resonant Frequency absorption Validate tap performance Min analog Video Ch 2-78 15.6dBmv

© 2009 JDSU. All rights reserved. JDSU CONFIDENTIAL & PROPRIETARY INFORMATION 12

Other Information

SmartScan uses all of the enabled carriers in the channel plan just like Full Scan

SmartScan compares the channels against the active limit set just like Full Scan

SmartScan adds additional limits of Max Tilt, Min Tilt, and Peak to Valley (labeled as Drop Check in limit settings for now)

SmartScan (beta) is still in Beta and is not a released item. Feedback is expected on it’s performance.

SmartScan will be chargeable option on some models once it is completed


Implementation of WRC-15 - ITU: Committed to … WRC-15 Before WRC-15 250 MHz 250 MHz 250 MHz 250 MHz 250 MHz 250 MHz 250 MHz Downlink 33% increase 10.95 GHz 11.45 12.5 GHz New allocation:

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