PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 260

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

PEB 2091
PEF 2091
Application Hints
Power Spectral-Density Measurement
– PSD is defined in ANSI T1.601 and ETSI TS 101080
– U-interface has to be terminated with 135
– IEC-Q is in “Data-Through" mode
– For measurements a spectrum analyzer is employed
Total Power Measurement
– Total power is defined in ANSI T1.601 and ETSI TS 101080
– Total power must be between 13 dBm and 14 dBm
– U-interface has to be terminated with 135
– IEC-Q is in “Data-Through" mode
– Measurements are done using an 80 kHz high-impedance low-pass filter and true
RMS-voltmeter
True RMS
IEC-Q
Voltmeter
80 kHz
ITS04227
Figure 98
Total Power Measurement Set-Up
Insertion Loss Measurement
– Insertion loss is defined in ANSI T1.601
– IEC-Q is in Data-Through mode
– Trigger and exit criteria have to be realized externally
Semiconductor Group
260
Data Sheet 01.99