Whiteley Electronics PETS-2 - Environmental

Page 36 of 40
Issue 2
13/12/99
PETS-2 Crossing Telephone System
QUICKFIX INSTALLATION HANDBOOK
36
AVERAGE LINE LEVEL: -13dB(m)
ISOLATION: 3.5KV ac rms. (to BS6301)
RETURN LOSS: >15dB (ref. 600R) 300Hz to 3.4KHz
BALANCE RETURN LOSS: >65dB to earth
MAXIMUM TRANSMISSION PATH ATTENUATION: 20dB resistive to guarantee DTMF
operation, but gain compensation is recommended if the loss is >10dB, to maintain
satisfactory speech performance.
6.4 Environmental
OPERATING TEMPERATURE : -20°C to 50°C
STORAGE TEMPERATURE : -25° to 70°C
ENCLOSURE PROTECTION : BS54520, IP55 (Level Crossing Unit only, and its Junction
Box should be protected from dripping water)
EMC EMISSIONS - EN 55022
EMC SUSCEPTIBILITY - EN 61000-4-3, EN 61000-4-4, EN 61000-4-5, EN 61000-4-6,