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ASL INTERCOM PRO Series에 대해서도 마찬가지입니다: 사용자 설명서 (11 페이지)

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microphone.

20 GOOSENECK MIC GAIN

This trimmer controls the gain of the gooseneck

microphone.

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 is to avoid earth loops and to minimize power

loss and the possible effect of electromagnetic

fields.

These rules are:

o 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.

o 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.

o 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.

o 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 earth or a safety earth.

See page 10 for Earthing Concept.

o 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.

o See Party Line, Technical Concept

o 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.

o 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.

o 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 with energy cables at

an angle of 90 degrees only.

Intercom cables should never be in the same

trunking as energy cables.