Wavetek 3HRV Manual do Utilizador descarregar pdf (Página 2)

The SDA series also offers significantly

faster forward sweep speed, especially in

systems that include many digital signals.

The SDA is capable of referencing 64/256

QAM signal types, so there is no need to

worry about subscriber interference or

injecting sweep carriers in the guard bands.

Stealth Sweep and SDA Series Sweep

Compatibility. The SDA series is com-

pletely sweep compatible with Stealth

3SR, 3ST, 3HRV and StealthTrak SSA-1000

series meters. The only requirement is

that firmware version 9.3 is installed in

Stealth Meters, and firmware version 2.0

installed in StealthTrak SSA-1000 meters.

Additionally, in order to take full advan-

tage of the faster forward sweep capabili-

ty, all headend and field instruments must

be SDA series.

Preparing the Network

for Interactive Services

Reverse Sweep. The SDA-5000 (with OPT

1 installed) allows simple and practical

testing of the reverse path frequency

response, regardless of the frequency (5

to 1,000 MHz). And the SDA has a built-in

reverse sweep transmitter, which means

externally generated carriers are not

required. Furthermore, the SDA-5500

transmitter and field receivers have fre-

quency agile telemetry. They can be con-

figured to communicate on both the for-

ward and reverse paths.

Forward (downstream) and reverse

(upstream) path alignment can be done

simultaneously by one person. The operator

simply indicates which screen he wants to

see—the response from the headend to the

test point, or the response from the test

point to the headend. A reverse sweep can

uncover mismatch problems, which reveal

themselves as standing waves, or diplex fil-

ter roll-offs that can severely hamper the

quality of services in the reverse band.

Multiple User Reverse Testing. For

intense reverse testing requirements, the

rack mounted Model SDA-5510 Headend

Reverse Sweep Manager handles the

reverse sweep job for up to ten different

technicians on the same cluster of nodes.

Using the SDA-5510 in conjunction with

the model SDA-5500 Transceiver provides a

full forward and reverse sweep alignment

solution. The SDA-5510 can also stand

alone in remote hub-sites for dedicated

reverse alignment applications.

Portable Reverse Sweep Manager. The

portable version of the SDA-5510 allows

technicians to install a multiple user

Reverse Sweep Manager in locations

where it is not practical to install a rack

mount unit. The SDA-5000 with OPT 6

provides all the functionality of the SDA-

5510, but in the rugged SDA-5000 field

unit package. Applications include instal-

lation in systems where reverse traffic is

received by an ATM/SONET/SDH network

rather than returning to the headend, or

any condition that prevents rack mount

installation or access to a headend/hub-

site (Note: Forward sweep capability not

included with SDA-5000 with OPT 6).

SDA instruments provide

a comprehensive set of

measurement tools that

will follow the expansion

of your cable network.

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