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Toa N-8031MS User Manual

Page 3

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3.3. Connection to External Switch

External switches such as footswitches can be connected
to the N-8031MS's external dial input terminals.
Terning on each switch connected to the terminal [7], [8],
[9], or [C] permits the same operation as performed by
pressing the dial [7], [8], [9], or [C].
An electrical current of 1 mA flows through each contact.

Note
The cable length from the external switch should not
exceed 3 m.

COM

C

9

8

7

N-8031MS rear

7
8
9
C

COM

External dial input terminals

[Connections]

Press down.

Cable

External dial input
terminal block

8 mm

3.4. The Type of Cables

The types of cables are to be determined according to the
following conditions.

• Twisted pair wires (such as those used for electronic

push-button telephone) are to be used for wiring
between the Exchange and the stations in principle.

• 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)

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-8031MS line terminal)

Conductor diameter: ø 0.4 – 1.6 mm (AWG14 – 26),

Solid wire/Stranded wire

External dial input terminal (N-8031MS)

Conductor diameter: ø 0.8 – 1.3 mm (AWG16 – 20),

Solid wire/Stranded wire

3.5. 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 Ω or less.

Conductor

Loop

Maximum cable length

diameter

resistance

between the Exchange and station.

(mm)

(Ω/ km)

(Assuming that the loop resistance is 170 Ω.)

ø0.4

295

570 m

ø0.5

187

900 m

ø0.65

113

1.5 km

ø0.9

58

2.9 km