System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
WT module
Aastra Proprietary Information Page 9-27
9.9.8 WT module
Interface data
Number of interfaces per module 2
Data rate
Asynchronous 0 to 9.6 kbit/s, transparent with
64 kHz oversampling
Data rate up to 2.4 kbit/s with 16 kHz oversampling
Oversampling at 8 kHz, 16 kHz, 32 kHz and 64 kHz
Maximum signal distortion at 9600 bit/s and
64 kbit/s oversampling
 15%
Electrical characteristics
Sampling circuit Separated via optocoupler
Input circuit Double- and single-current interface
Input impedance of the input circuit
at –1 V U
SAMPLE
7 V 1 kOhms ± 10%
at 3 V
U
SAMPLE
< 7 V 3 kOhms ± 10%
Response threshold 1.2 V to 2.8 V
Output circuit Push-pull final stage isolated via optocoupler
Internal impedance Ri 300 Ohms ± 10%
External voltage
External voltage ± UW (± 12V/± 24V) must be applied externally
Table 9.J: DSK Modular