ASL INTERCOM PS 280 Manuale d'uso - Pagina 6

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7.0

CABLING

For the PRO Series Intercom system the interconnecting

cables are of the shielded two-conductor microphone

cable type and the intercom line connectors are of the

XLR-3 type. Audio and Call signals are on XLR pin 3, DC

power is on XLR pin 2. XLR pin 1 is connected to the

shield of the cable which functions as the common return

for audio and power.

Since the audio signal is transferred in an unbalanced *

way, certain rules have to be obeyed when installing the

cables of an intercom network. This in order to avoid earth

loops and to minimize power loss and the possible effect

of electromagnetical fields.

These rules are:

Use high quality (multipair) cable.

For interconnecting user stations, power supplies and

accessories in an ASL Intercom network, use high

quality shielded two-conductor (minimum 2x 0.30 mm2)

microphone cable only.

In case of a multi channel intercom network, use high

quality microphone 'multipair' cable only, each pair

consisting of two conductors (minimum 2x 0.15 mm2)

with separate shield. Multipair cable should have an

overall shield as well.

Use flexible cables.

Use flexible single and multipair microphone cable

instead of cable with solid cores, especially when the

cable is subjected to bending during operation or

installation.

Separate cable screen to XLR pin 1.

The screen of each separate microphone cable and/or

the screen of each single pair in a multipair cable,

should be connected to pin 1 of each XLR-3 connector.

Do not connect this cable screen to the metal housing

of the connector or to metal wall boxes (outlets).

See last page for Earthing Concept.

Cable trunks, connection boxes and overall

multipair cable screen to clean earth.

Metal cable trunks, metal connection boxes and overall

multipair cable screen should be interconnected and,

at one point (the 'central earthing point') in the intercom

network only, be connected to a clean earth or a safety

earth.

See last page for Earthing Concept.

Keep metal connection boxes and cable trunks

isolated from other metal parts.

Metal housings for intercom cables and connectors

should be mounted in such a way that they are isolated

from other metal cable and connector housings and

from any other metal construction parts.

See Party Line, Technical Concept

Keep cables parallel as much as possible.

When two (multi channel) units in a network are

connected by more than one cable, make sure that

these cables are parallel to each other over the whole

distance between those units. When using multipair

cable, parallelism is ensured in the best possible way.

Avoid closed loops.

Always avoid that cables are making a loop. So-called

'ring intercom' should not physically be cabled as a

ring. All cable routes should have a 'star' configuration,

with the central earthing point (usually close to the

power supply position) as the center of the star.

Keep cables away from electromagnetical sources.

Keep intercom cables away from high energy cables,

e.g. 110/220/380V mains power or dimmer controlled

feeds for spotlights.

Intercom cables should cross with energy cables in an

angle of 90 only.

Intercom cables should never be in the same (metal)

trunks with energy cables.

Place power supplies in a central position.

In order to avoid unacceptable power losses, place the

power supplies as close as possible to where most

power consumption occurs or, in other words, most

user stations are placed.

Connect ASL power supply to a 'clean' mains

outlet.

The ASL power supply may be connected to the mains

power outlet to which other audio equipment is

connected. Avoid using mains outlets which also power

dimmer controlled lighting systems.

In case of more complex installations, don't hesitate to

network with a list of all user stations and their positions,

and we are happy to advise you on cabling lay out.