PEF24901HV22XT Lantiq, PEF24901HV22XT Datasheet - Page 82

• Manufacturer Part Number: PEF24901HV22XT
• Manufacturer: Lantiq

Specifications of PEF24901HV22XT

• Control Interface: HDLC
• Lead Free Status / Rohs Status: Compliant

4.4.4.3
In the reset mode the DFE-T V2.2 does not transmit any signals. The chip is in the
“Reset” state. All echo canceller and equalizer coefficients are reset. As can be seen
from the state diagram, no activation is possible if the device is in the “Reset” state.
For measurements two methods are recommended in order to transfer the U-transceiver
into the master-reset mode:
– hardware selection:
– software selection:
The reset test mode is used for the return-loss measurements.
4.4.4.4
– Pulse mask is defined in FTZ Guideline 1TR 220 and ETSI TS 102 080
– U-interface has to be terminated with 150
– U-transceiver is in “Send-Single-Pulses” mode (C/I = ’SSP’ or Pin-SSP = ’1’)
– Measurements are done using an oscilloscope
4.4.4.5
– PSD is defined in FTZ Guideline 1TR 220 and ETSI TS 102 080
– U-interface has to be terminated with 150
– U-transceiver is in “Data-Through” mode (C/I = ’DT’ or Pin-DT= ’1’)
– For measurements a spectrum analyzer is employed
4.4.4.6
– Return loss is defined in FTZ Guideline 1TR 220 and ETSI TS 102 080
– U-transceiver is in “Reset” state (C/I = ’RES’ or Pin-RES= ’0’)
– Measure complex impedance “Z” from 5 kHz – 100 kHz
– Calculate return loss with formula:
4.4.4.7
– Quiet mode is defined in FTZ Guideline 1TR 220 and ETSI TS 102 080
– U-transceiver is in the “Reset” state (C/I = ’RES’ or Pin-RES= ’0’)
– Trigger and exit criteria have to be realized externally
4.4.4.8
– Insertion loss is defined in FTZ Guideline 1TR 220 and ETSI TS 102 080
– U-transceiver is in “Data-Through” mode (C/I = ’DT’ or Pin-DT= ’1’)
– Trigger and exit criteria have to be realized externally
Data Sheet
RL(dB) = 20log (abs((Z + 150) / (Z –150)))
Reset Mode
Pulse Mask Measurement
Power Spectral-Density Measurement
Return-Loss Measurement
Quiet Mode Measurement
Insertion Loss Measurement
Pin-RES= ’0’ (see
C/I-code= RES (0001
83
Table
B
)
3)
Operational Description
PEF 24901
2002-09-30
DFE-T