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Cabling the unit
All Line and Extension circuit cabling is inserted from the top of the unit. There are breakouts
as shown on the top of the unit to facilitate routing of cables into the MDF area.
Connecting the Extensions
It is recommended that all Extensions be cabled with two pairs. The Feature phones use all
four wires and standard phones use the AB pair only.
Do not exceed the following resistance or distance limits when connecting extensions to the
System Unit. (The distances listed assume 0.5mm-tinned copper conductor is used).
100 Ohms, or 500 metres, for system Feature phones.
200 Ohms, or 1.4 kilometres, for a standard telephone
The Extension cables must be of twisted-pair construction, using insulated tinned copper
wires of nominal 0.5 mm cross-sectional area.
Category 5 cable must be used for all ISDN installations.
It is important that this size and type of wire is correct since incorrect types can result in
unreliable connections. Care should be taken to ensure that the cabling complies with all
relevant cabling requirements.
Run cable from each Extension location to the Main Equipment. Pass the cable through the
cable entry hole in the CCU or Expansion Module and terminate the Extension wiring at the
appropriate connector in accordance with the table below.
Four wires per Extension are connected at the Main Equipment.
Spare wires must be neatly laid back away from the connectors. To prevent cross talk or
interference, cable pairs should not be split or the spare wire of cable pairs used.
All Extensions should connect into standard line jack units. Extension
cabling should not be exposed to high voltage surges, (for example,
surges induced by lightning or neighbouring high current-carrying
cables). If this is a possibility external protection of the Main Equipment
and Extensions using 'earthed line surge protectors' is essential.
Mitel 3000 Australia Installation and Maintenance Manual
Cabling Break outs
33
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