Wavetek 3HRV Manuel d'utilisateur télécharger pdf (Page 3)

Seeing Headend/Hub-Site Accumulated

Ingress in the Field.

The reverse noise

feature of the SDA-5000 enables easy

reverse path noise testing. The operator

simply presses the "Noise" soft key while

reverse sweeping, and the display changes

to a noise/ingress response indicating the

noise level over the entire reverse path

spectrum measured at the headend or

hub-site. All SDA transmitters provide

feedback to the field regarding the current

condition of noise and ingress in the head-

end, even when noise or ingress is

"swamping" the telemetry (broadcast

mode). A "picture" of the headend

noise/ingress is sent out to the receiver via

a special forward telemetry carrier.

! Reverse ingress spectrum display.

QAM View Ensures Quality Forward Path

Digital Services. For measurement and

analysis of digital TV and forward modem

signals, the new digital QAM View option

provides a full complement of digital quali-

ty measurements. Included is a 64/256

QAM constellation display with zoom,

average digital power level, Bit Error Rate

(BER), 21 to 35 dB Modulation Error Ratio

(MER) and noise margin "cliff effect" para-

meter. An equalizer display shows equaliz-

er stress and distance to fault.

! Constellation display with MER and

pre/post FEC BER.

In addition, an exclusive noise mode allows

technicians to see ingress/noise under an

active digital carrier. This tool is invaluable

for detecting forward path ingress otherwise

hidden by conventional spectrum views!

! QAM ingress feature shows noise/ingress

under an active carrier.

Measuring the Behavior of DOCSIS

Compatible Cable Modem Signals in the

Cable Plant.

For "bursty" digital signals,

such as TDMA technologies used on cable

modems for reverse services, the SDA-5000

uses the advanced Zero Span capabilities

to make the measurement. Time domain

displays of TDMA signals allow power mea-

surement, D/U (desired/undesired mea-

surements), and detection of packet colli-

sions, all while the modem is in service.

Technicians can measure the level of inter-

ference in the actual channel being used.

! Reverse digital modem signal.

! Cable modem analysis using Zero Span

mode provides accurate, in-service, power

and C/N Measurements.

"One Box" Solution

How many test instru-

ments should the network

maintenance technician

carry? One. A lightweight,

rugged and affordable

meter with the versatility

to test the latest digital

services while maintaining

the analog spectrum. This

"One Box" philosophy

shaped the design of the

SDA series, adding the

analog and digital test

tools most requested by

field technicians and

system operators

throughout the world.

Analog Testing

• Forward RF Sweep

• RF Level, Fast Scan, Tilt

• In-service Carrier to

Noise, HUM, Depth

of Mod.

• Fast Spectrum Display

with CTB/CSO

• Auto Testing/24 Hour

Testing (FCC & CENELC

Compliant)

Return Path Testing

• Reverse RF Sweep

• PathTrak Field

View (Option)

• Reverse Alignment

Mode Prepares

Network for Cable

Modem Deployment

• Zero Span

Spectrum Mode

• DOCSIS/DAVIC

Compatible Cable

Modem Analysis

Advanced Digital Testing

• DigiCheck™

Average Power

• QAM View Digital

Analysis with MER,

Pre/Post FEC BER,

Constellation, and

Exclusive Noise / Ingress

Under the Carrier

Measurement

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