MC55i Terminal Hardware Interface Description
4 Electrical and Environmental Characteristics
41
MC55i_Terminal_HD_v01.201a
Page 33 of 47
2010-04-16
Confidential / Released
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
