PXB4220

P The "Interworking Element for 8 E1/T1 lines" (IWE8), PXB 4220 and PXB 4221 are members of Infineon" ATM Chipset. Together with framing and line interface components (e.g. Infineon's QuadFALC PEB 22554) the IWE8 serves as gateway between Asynchronous Transfer Mode (ATM) networks and timeslot based PDH networks. The IWE8 is a single chip multiservice device that integrates ATM cell handling and TDM circuit to ATM cell interworking in E1/T1 applications. Each of the 8 E1 or T1 input and output ports can be configured independently to operate in ATM Mode or AAL Mode. It is a very flexible solution supporting multiple services with a minimum of devices. R O D U C T B R I E F Features s s s s s Full duplex ATM Packetizer/ Depacketizer for 8 E1/T1 highways Configurable to T1 or E1 mode via external pin 8 T1/E1 ports configurable independently to ATM or AAL Mode ATM Mode: - ATM cell mapping into PDH according to ITU-T G.804 - B-ISDN User-Network Interface - Physical Layer Operation at 1544 kbit/s and 2048 kbit/s according to ITU-T I.432.3 AAL Mode (PXB 4220/4221): - AAL1 according to ITU-T I.363.1 or transparent without any adaptation layer overhead (AAL0) - Structured T1/E1 N x 64 kbit/s service - Channel Associated Signalling (CAS) - Partially filled cells with programmable filling thresholds - Reassembly buffer can compensate up to +/- 4 ms Cell Delay Variation (CDV) - Statistics counters per channel for lost/misinserted/errored cells etc. - Internal clock recovery cir...