Table 22: Operating Conditions; Table 23: Highest Temperatures - Siemens TC65 Terminal Hardware Interface Description

TC65 Terminal Hardware Interface Description
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Table 22: Operating conditions

Parameter
Ambient temperature
Supply voltage V
POWER
measured at (6-pole) western
jack plug (1, 2 to 5,6)
*)
Continuous operation at 65°C environmental temperature is not possible in every
operating mode due to intrinsic heating of the TC65 Terminal.
The level of intrinsic heating depends on several factors depending on the level of the
supply voltage, the operating mode (GPRS/GSM) and the network coverage. The
maximum possible environmental temperature in GPRS Class 12 operating mode (MS-
configuration 1down/4up, PCL5/Gamma3, 12V supply voltage, 900MHz band, with power
reduction) is about 45°C. When this temperature is exceeded the TC65 Terminal will send
a request to the base station for changing the GPRS-Class (e.g. from GPRS Class 12 to
GPRS Class 8). At a successful change of the GPRS class the intrinsic heating of the
TC65 Terminal will be reduced. If the board temperature decreases by an amount of 15°C
the GPRS Class will be stepped up again.
Continuous operation in Talk mode is possible up to an environmental temperature of
about 67°C (12V, 900MHz, PCL5). With decreasing transmit power of the TC65 Terminal,
the maximum possible environmental temperature increases at which a GPRS continuous
operation at PCL5/Gamma3 is possible.
For a short time it is also possible to establish a GPRS Class 12 connection at
PCL5/Gamma3 and at an ambient temperature of 65°C. Starting a data download in GPRS
Class 12 mode with power reduction at 65°C environmental temperature the request for a
change of the GPRS Class will be enabled after 7 minutes. This information applies to 12V
supply voltage. At 8V resp. 30V the intrinsic heating is higher, whereby the maximum
possible environmental temperature will be lower.
The following table shows the highest possible ambient temperatures at which the
temperature of the NTC will reach a final value of 81°C (GPRS Class 10,12 Temperature of
GPRS Class Change) or the final shut down temperature 90°C (GPRS Class 8 and Voice
Call).

Table 23: Highest temperatures

Terminal horizontal, normal position
GPRS Class 8 PCL5/Gamma3
GPRS Class 10 PCL5/Gamma3
GPRS Class 12 PCL5/Gamma3 with Power Reduction
GPRS Class 12 PCL5/Gamma3 without Power Reduction
TC65 Terminal_HD_V02.000b
Min
-30
7.6 lowest voltage
(minimum peak) incl. all
ripple and drops
Highest possible ambient temperature
67°C
48°C
45°C
34°C
Page 49 of 65
Typ Max
*)
25 65
12 30
s
Unit
°C
V
19.02.2007