ASL INTERCOM PS 4379 Manuel d'utilisateur télécharger pdf (Page 16)

- 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 energy cables at an

angle of 90° only.

Intercom cables should never be in the same trunking

as energy cables.

- Place power supply in a central position.

In order to avoid unacceptable power losses, place the

power supply 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.

For the PRO Series Intercom system the inter-

connecting 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 10 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 page 10 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

10.0 CABLING

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ASL INTERCOM PS 4379 Manuel d'utilisateur Page 16

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