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Page 188 of 504 M3900 installation and configuration
553-3001-367 Standard 3.00 August 2005
Line engineering
The M3900 Series Digital Telephones use twisted pair wiring on transmission
lines determined by the rules in “Digital telephones line engineering” on
page 289. The maximum acceptable loop length is 1067 m. (3500 ft),
assuming 24 AWG (0.5 mm) standard twisted wire with no bridge taps. A
15.5 dB loss at 256 kHz defines the loop length limit. Longer lengths are
possible, depending on the wire’s gauge and insulation.
Table 34
M3900 Electromagnetic Compatibility standards: Immunity
EMC - Immunity Description
EN50082-1 Electromagnetic Compatibility - Generic immunity
standard Part 1: Residential, commercial and light
industry (Europe)
EN 55024 Information technology equipment — Immunity
characteristics — Limits and methods of
measurement (Europe)
IEC 801-2 (level 4) Electro Static Discharge (Europe)
IEC 801-3 (level 2) Radiated Immunity (Europe)
IEC 801-4 (level 3) Fast Transient/Burst Immunity (Europe)
CAUTION
Use only the line cord provided with the telephone. A line cord
designed for another telephone can cause damage to the equipment.