Toa N-8000 Series - Manual (Page 386)

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Chapter 3 INSTALLATION & WIRING
13.14. 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.
For the maximum (2-core shielded) cable length to be used for connection between the N-8000RS/8010RS
Substation interface unit and the RS-150/160/170/180 Substation, RS-140/143/144 Switch panel, or RS-142
Switch board, refer to the following table.
For the maximum (two pairs of twisted pair) cable length to be used for connection between the N-8400RS
Substation interface unit and the N-8410MS Master station or the RS-450/460/470/480 Substation, refer to the
following table.
Conductor diameter
(mm)
Loop resistance
( Ω/km)
Maximum cable length between the Exchange and station.
(Assuming that the loop resistance is 170 Ω)
ш 0.4
ш 0.5
ш 0.65
ш 0.9
295
187
113
58
570 m
900 m
1.5 km
2.9 km
Conductor diameter
(mm)
Maximum cable length
(km)
ш 0.5
ш 0.65
ш 0.9
0.5
0.8
1.3
Conductor diameter
(mm)
Maximum cable length
(km)
ш 0.5
ш 0.65
ш 0.9
1.0
1.5
2.0