AudioShare ASA468 Manual do utilizador - Página 8

Procurar online ou descarregar pdf Manual do utilizador para Adaptador AudioShare ASA468. AudioShare ASA468 12 páginas. Retrofit adapter

WIRING RECOMMENDATIONS

With the ASA468 Adapter, several wire types can be used. There are only a few

simple rules to follow, mostly for safety and/or operational integrity reasons. The

following wire types have been tested and represent a large majority of wire types

that may be encountered in retrofit installations.

M&S MS4XSC – 22 ga., 2-pair solid conductors with individual shields and gray

outer insulation (essentially, 2 sets of high grade differential audio cable in one

sheath), used for M&S wall stations. This cable can be used as 3 pairs by taking

advantage of the 2 shield (drain) wires which are insulated from each other as long

as the inside ends of the individual foils or the wires themselves don't touch each

other.

When using as 2-pair cable only, simply use the individual pairs and leave the

shields unconnected. This will only allow for one media bus operation.

The shield wires can be used as a third pair thus allowing the second media bus

operation. Our recommendation is to use one of the pairs for power (pins 1&2)

and the second pair for media bus 2 (pins 5&6). The shield wires should then be

used for the data bus (pins 3&4) since it operates at a lower frequency and is less

susceptible to the impedance mismatch created by the shield wires. The individual

shield wires should be insulated with a sleeve to keep them from shorting together.

Another sleeve (e.g., heat shrink tubing) should be installed over the end of each

foil to prevent them from touching each other. It is highly recommended that the

shield wires not be used as the power conductors (pins 1&2) since, if they do short

together, the resulting damage would be far worse than if the data bus shorted out.

M&S MS4DCXSC – 22 ga. 2-pair solid conductors with individual shields and

orange outer insulation, used for M&S door stations. See MS4XSC, above.

Nutone IW-6 – 22 ga. 3-pair solid conductors. This cable is excellent in

retrofit installations since it works well with the ASA468 Adapter and no

special precautions are needed.

The following wire types have been tested and WILL NOT WORK:

Nutone IW-4

M&S MS4X - 22 ga. 4 conductor flat ribbon cable

M&S 7-conductor for discontinued model 902