Overview
The IEC-4-AFE-X Version 3.2 is part of Infineon´s chip set for a splitterless, FDD (non-overlapped) ADSL over ISDN linecard based on GEMINAX MAX according to Ref [3.], chapter 4.2.2 of Ref [5.], Annex B of Ref [6.] / Ref [7.], and Ref [8.]. Figure 1 shows the basic architecture of an integrated ISDN and ADSL linecard based on GEMINAX MAX chip set. The IEC-4-AFE-X Version 3.2 is designed for use in central office, DLCs and DSLAMs.

Features of the IEC-4-AFE-X Version 3.2
• Four port ISDN Echo Cancellation Circuit Analog Frontend
• Offers all features of AFE V2.1 (Ref [1.])1)
• Integrated digital transmit low-pass filter, which obsoletes the need for an discrete, passive splitter device
• Conforms in connection with GEMINAX MAX chip set to Ref [3.], especially to the following ISDN PSD masks:
    - ’PSD mask for a 4B3T ISDN system with integrated splitter’ acc. to Ref [3.] (4B3T ADSL friendly, compatible to ADSL US spectrum down to 138 kHz)
    - ’PSD mask for a 2B1Q ISDN system with integrated splitter’ acc. to Ref [3.] (2B1Q ADSL friendly, compatible to ADSL US spectrum down to 120 kHz)
• Footprint compatible to AFE V2.1 (Ref [1.])
• Serial control interface for communication with GEMINAX MAX chip set