GAI-Tronics 491-204 Mine Dial / Page Phone - Manual (Page 9)

Pub. 42004-195E
Model 491-204 Mine Dial/Page Telephone Page: 9 of 9
f:\standard ioms - current release\42004 instr. manuals\42004-195e.doc
04/10
Typical Cable Characteristics
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 Inductance
Capacitance
(conductor to conductor)
Maximum
Cable Length
No. 22 AWG 16.5 ohms per
1000 feet
Maximum 0.20
µH/foot Maximum 35 pF/foot 15,750 feet
(~3 miles)
No. 18 AWG 7.1 ohms per
1000 feet
Maximum 0.20
µH/foot Maximum 35 pF/foot 31,500 feet
(~6 miles)
No. 14 AWG 2.8 ohms per
1000 feet
Maximum 0.20
µH/foot Maximum 35 pF/foot 63,000 feet
(~12 miles)
Replacement Parts
Part Number Description
10415-101 Handset Assembly
12502-101 Replacement Receiver Kit
12504-010 Keypad Replacement Kit - Models 491-103, 491-104, and 491-204
12506-003 Speaker Replacement Kit
12567-001 Page Switch
61507-009 Harness Assembly/Subset
69491-002 Keypad Amplifier PCBA
69491-401 Speaker Amplifier PCBA