ADDER X-KVM Manuel d'utilisateur télécharger pdf (Page 3)

What is an Extender?

ADDERLink Extenders enable you to increase the distance

between your computer (or similar signal source) and the

point of use/display.

Extenders come in a variety of formats which include some

or all of; Video, Keyboard, Mouse, USB, Audio and RS232

Control. Essentially, extending all devices which sit external

to the computer.

Who uses Extenders?

There are a large number of scenarios which call for the

benets of peripheral extension.

In a server room/data centre environment, extenders can be

used to create remote consoles quickly and cheaply.

In public installations, an extender allows you to protect

the computer system, minimising potential damage

(either accidental or vandalised) by locating it in a secure

environment. Co-locating such systems also give greater

installation exibility, you no longer need to house a

computer, consider heat dissipation, or insulate the effects

of fan noise.

Work environments benet similarly from co-location.

For example, sound/signal sensitive environments such as

Audio/Video Post Production or controlled areas in scientic

laboratories can eliminate noise, and minimise heat impact

from computers. Environmentally sensitive areas such as

server/machine rooms can be kept undisturbed reducing

the need for additional cooling by extending control

elsewhere.

Dangerous industrial environments can also be controlled

remotely, minimising the risk of damage to the user

from very loud noise, temperature, moving machinery or

dangerous/poisonous atmospheres.

In military/defence, extenders are often used to allow

greater protection of computing equipment. In a ship for

example, the machine room can be located in a secured

and resilient structure deep within the ship’s core, and

functionality fed out across the ship via extenders.

AV only extension is used throughout the Digital

Signage industry as a low cost, highly resilient method of

distributing Audio and Video content to large numbers

of remote screens. AV extension combined with RS232

also gives system operators the ability to remotely control

and interrogate individual screens around the installation,

scheduling power and channel automatically using software

such as Adder’s Display Manager.

How are Extenders Installed?

Extenders are made to be as simple as possible to install.

ADDERLink Extenders come with a range of connectivity

options to perfectly suit your requirements. The rst

consideration is ‘what connections will be needed?’. The

ADDERLink range offers analogue VGA and digital DVI

video connectivity together with a choice of PS/2 or USB for

keyboard and mouse. Some extenders also support other

USB devices e.g. peripheral devices such as printers, scanners

and web cams to name a few. The ADDERLink range also

provides audio and RS232 connectivity amongst the range.

Once you have considered the connection types required,

you then need to consider the extension distance needed.

ADDERLink Extenders range from 40m to 300m extension

distance dependant upon the type of connections used.

Most extender ‘pairs’ (transmitter and receiver) use low

cost CAT5 cable to connect across long distances. The

reason we use CAT5 cable as the signal transport medium is

that it is low cost, easy to install through cable duct, walls,

ceilings etc and it is highly reliable. CAT5 cable has been in

use across LAN networks for decades and during that time

has proven to be an ideal routing cable. Furthermore, many

commercial buildings already have CAT5 cable installed for

use in local area networks which means many users do not

need to install cable at all.

The ADDERLink DVI extender (X-DVI) is slightly different in

that we recommend the use of shielded CAT6 cable. This is

because of the enormous amount of uncompressed data

that is carried, and ensures signal isolation from external

RF devices which can have a signicant impact on digital

data streams. CAT6 cable is as easy to install as CAT5, and is

commonly used across Gigabit Ethernet networks.

Other Considerations

When an extender is installed across a very long distance,

an effect of the cable called ‘cable skew’ can become

apparent. Cable skew is caused by the strands of wire

within the CATx cable having slightly different lengths.

The amount of skew is entirely dependent upon the cable

itself and may differ between manufacturers. In practice,

the skew results in some signals experiencing increased

delay (because they need to travel through more wire than

other signals components). As an example, in an analogue

VGA signal, split into RGB components and sent through

separate wire pairs, the effect would be a slight shift in

colour eld at the receiver. To counteract this, ADDERLink

extenders are available with ‘De-Skew’ functionality to

bring the component signals back into perfect alignment.

Once set, this does not need to be changed unless you

connect a different CATx cable.

The other option available when installing CATx cable is

to use ‘skew-less cable’ which is carefully manufactured to

ensure consistent wire length and twist.

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ADDER X-KVM Manuel d'utilisateur Page 3

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