MC55i Terminal Hardware Interface Description
4 Electrical and Environmental Characteristics
41
MC55i_Terminal_HD_v01.201a Page 33 of 47 2010-04-16
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4 Electrical and Environmental Characteristics
4.1 Absolute Maximum Ratings
Table 13: Absolute maximum ratings
Parameter Port / Description Min. Max. Unit
Supply voltage PLUS -50 30 V
Overvoltage PLUS / for 1min 33 V
Input voltage for on/off
Control lines
/IGT_IN, /PD_IN -5 30 V
RS-232 input voltage range /TXD, /DTR, /RTS -20 +20 V
/RXD, /CTS, /DSR, /DCD, /RING -0.3 +5.3 V
Microphone input line volt-
age
MICP, MICN -0.3 +10 V
Earpiece input voltage EPP, EPN -0.3 +0.3
1
1.
max. 3.0V while MC55i Terminal is switched on.
V
Immunity against dis-
charge of static electricity
all connectors (lines) -8 +8 kV
Protection Class IP40
(avoid exposing MC55i Terminal to
liquid or moisture, for example do not use
it in a shower or bath)
IP 40
Mechanical vibrations
amplitude
@ 5-200Hz 7.5 mm
Mechanical pulse-acceler-
ation
@ 18 ms duration 30 g
Table 14: Operating supply voltage for MC55i Terminal
Parameter Min Typ Max Unit
Supply voltage PLUS mea-
sured at (6-pole) western
jack plug (1 to 6)
7.6 lowest voltage
(minimum peak) incl.
all ripple and drops
12 30 V
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