PXB4220E Infineon Technologies AG, PXB4220E Datasheet - Page 20

• Manufacturer Part Number: PXB4220E
• Description: Interworking Element for 8 E1/T1 Lines
• Manufacturer: Infineon Technologies AG

IWE8, V3.4
PXB 4219E, PXB 4220E, PXB 4221E
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
20
2003-01-20