MS Series PABX User Manual
5
● A marginal space around the exchange should be remained for heat sink,
inspection and maintenance of the system.
● A wall bore is available at the underside of mainframe for wall installation.
Desk installation is also admitted. But the contact of wall bolt and circuit
board inside the mainframe should be avoided.
● Please keep the exchange away from other equipment producing large
electromagnetic disturbance (such as motor and large transformer).
● None of the wiring of any extension should share the pipeline with power
supply or antenna. Neither should the extension be close to antenna for air
broadcasting (including short-wave).
● Avoid damaging the power-supply cable. Keep it away from water.
Encountering the leakage of water cut off the power immediately.
● Please don't impact or shake the exchange at any situation. Don't
remove the exchange in working status.
● If the wiring pipeline of the extension is disturbed by electromagnetic
wave while substitution is unavailable in site, special insulating wire for
communication is suggested for substitution, also, the insulating net of
which should be grounded.
2.4 Warning
● The wiring should not be done in thundering.
● Avoid using telephone in thundering.
● Please don't use the telephone in flammable and leaking gas
environment.
● Unless the equipment is disconnected, please don't touch the broken
part of the wiring or any connection ends.
◆ Note: Lightning stroke is an accident, which will not be regarded
as normal maintenance.
2.5 Installation procedure
2.5.1 ConnectingC.O. lines & extensions to theunit:
● Please connect the RJ11 crystal head with EXT port and C.O port
separately;
● Make sure to avoid short circuit.
● Connecting extensions according to the in-dilated extension positions
and C.O. lines to the corresponding line ports on the unit.
2.5.2 Zero-load power-on inspection:
● The operation voltage of this product is AC220V or AC110V. Check out
the voltage of local power supply. A UPS backup is highly recommended.
● Plug in the power supply line, indicating normal power supply and
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