Toa N-8000 Series Ver.1.41 - Manual (Page 127)

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Chapter 3: INSTALLATION & WIRING
4.5. Type of Cable
The types of cables are to be determined according to the following conditions.
To use twisted pair wires (such as those used for electronic push-button telephone) for wiring between the
Exchange and the stations, and for connections to the Multi interface unit's audio input/output terminals and
PBX interface terminals.
Use a straight through cable of UTP category 5 or more with RJ-45 connector for wiring the equipment to IP
network.
The number of cables pairs laid should be determined considering the possibility of future expansion of the
system.
Outdoor wires should be used where wiring passes through inaccessible areas such as ceilings or under
floors where the maintenance is not performed. Indoor wires may also be used, however, in case where there
is no risk of deterioration due to exposure to heat, etc.
Note
Specifications related to each junction are as follows.
Mini-clamp connector (N-8000EX/8010EX line terminal and N-8000MI PBX interface terminal)
Conductor diameter: ø 0.4 – 0.65 mm (AWG22 – 26), Solid wire
Outside diameter: ø 1.05 mm or below
Clip terminal (E-7000TB)
Conductor diameter: ø 0.4 – 0.8 mm (AWG20 – 26), Solid wire
Outside diameter: ø 1.5 mm or below
Removable terminal plug (N-8000EX Paging output and N-8000MI Control I/O and Audio I/O terminals)
Conductor diameter: ø 0.5 – 2 mm (AWG12 – 24), Solid wire/Stranded wire
Removable terminal plug (N-8031MS line terminal)
Conductor diameter: ø 0.4 – 1.6 mm (AWG14 – 26), Solid wire/Stranded wire
External speaker terminal (N-8000MS/8500MS)
Conductor diameter: ø 0.4 – 1.3 mm (AWG16 – 26), Solid wire
ø 0.7 – 1.4 mm (AWG16 – 22), Stranded wire
External speaker terminal, Control output terminal (N-8020MS)
Conductor diameter: ø 0.65 mm (AWG22), Solid wire
ø 0.7 mm (AWG22), Stranded wire
External dial input terminal (N-8031MS)
Conductor diameter: ø 0.8 – 1.3 mm (AWG16 – 20), Solid wire/Stranded wire
Station terminal (N-8050DS line terminal, contact output terminal, N-8540DS contact output terminal)
Conductor diameter: ø 0.4 – 1.3 mm (AWG16 – 26), Solid wire/Stranded wire
4.6. Relations Between Core Diameter of Cable and Maximum Cable Length
Refer to the following chart as guidelines when designing the distance between the Exchange and stations so
that loop resistance value becomes 170
or less.
Maximum cable length between the Exchange and station.
(Assuming that the loop resistance is 170 )
570 m
900 m
1.5 km
2.9 km
Loop resistance
( /km)
295
187
113
58
Conductor diameter
(mm)
ш 0.4
ш 0.5
ш 0.65
ш 0.9