PXB4221 Infineon Technologies AG, PXB4221 Datasheet - Page 23

• Manufacturer Part Number: PXB4221
• Description: IWE8 Interworking Element for 8 E1/T1 Lines
• Manufacturer: Infineon Technologies AG

PXB4219 / PXB4220 / PXB4221
Overview
IWU
PDH
ATM
FALC LH
SIDEC
IWE8
network
PEB2255
PEB20954
PXB4220
network
Near End
Far End
Figure 4
Echo Canceller Application
The echo cancelling function itself is performed in STM. In the application above the
IWE8 is used to translate voice ATM channels into STM channels and vice versa.
Infineon’s Smart Integrated Digital Echo Canceller (SIDEC, PEB 20954) is used for
cancellation of the echo that is generated by reflection on the near end side and heard
by the far end speaker. The SIDEC can cancel end echo paths (SDH or PDH network
on near end side) up to 128 ms. For details see [21]
Data Sheet
23
2002-05-06