GAI-Tronics 491-204 Manuale - Pagina 9
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Model 491-204 Mine Dial/Page Telephone
The table below defines cable size with cable characteristics to achieve increased operating distance and
is dependant upon the type and quality of cable utilized, optimum cable line installation and PBX.
Cable Size
DC Resistance
No. 22 AWG
16.5 ohms per
1000 feet
No. 18 AWG
7.1 ohms per
1000 feet
No. 14 AWG
2.8 ohms per
1000 feet
Part Number
10415-101
12502-101
12504-010
12506-003
12567-001
61507-009
69491-002
69491-401
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Typical Cable Characteristics
Inductance
Maximum 0.20
µH/foot
Maximum 0.20
µH/foot
Maximum 0.20
µH/foot
Replacement Parts
Handset Assembly
Replacement Receiver Kit
Keypad Replacement Kit - Models 491-103, 491-104, and 491-204
Speaker Replacement Kit
Page Switch
Harness Assembly/Subset
Keypad Amplifier PCBA
Speaker Amplifier PCBA
Capacitance
(conductor to conductor
Maximum 35 pF/foot
Maximum 35 pF/foot
Maximum 35 pF/foot
Description
Pub. 42004-195E
9 of 9
Page:
Maximum
Cable Length
)
15,750 feet
(~3 miles)
31,500 feet
(~6 miles)
63,000 feet
(~12 miles)