ASL INTERCOM PS 285 Manuale d'uso - Pagina 7

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8.0

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 is to avoid earth loops

and to minimize power loss and the possible effect of

electromagnetic 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

also have an overall shield.

•

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 page 12 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 inter-

connected and, at one point (the central earthing

point ) in the intercom network only, be connected to

a clean safety earth.

See page 12 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 centre of the star.

•

Keep cables away from electromagnetic 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 high energy cables at an

angle of 90 ° only.

Intercom cables should never be in the same trunking

as 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

planned network with a list of all user stations and their

positions, and we are happy to advise you on cabling

lay-out.