PXB4219E Datasheet, PDF (14/290 Pages) Infineon Technologies AG – Interworking Element for 8 E1/T1 Lines

IWE8, V3.4
PXB 4219E, PXB 4220E, PXB 4221E
Overview
1
Overview
The Interworking Element for
8 E1/T1 Lines PXB 4219E, PXB 4220E, PXB 4221E (IWE8) is a member of Infineon’s
ATM chip set. 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.
Each of the 8 E1 or T1 input and output ports can be configured independently to operate
in one of two basic modes:
ATM Mode
ATM mode ports operate as an ATM User Network Interface (UNI) at 2.048 Mbit/s (E1)
or 1.544 Mbit/s (T1).
The device supports mapping of ATM cells in T1/E1 frames according to ITU-T G.804,
“ATM Cell Mapping into Plesiochronous Digital Hierarchy (PDH)” [26] and ATM Forum,
“ATM on Fractional E1/T1” [9].
It implements all Transmission Convergence (TC) sublayer functions of the Physical
Layer (PHY) defined in ITU-T I.432, “B-ISDN User-network Interface - Physical layer
Specification” [32]
AAL Mode
AAL mode ports operate as an ATM Circuit Emulation Service Interworking Function
(CES-IWF) between Constant Bit Rate (CBR) equipment and an ATM network as
described by the ATM Forum, “Circuit Emulation Services Version 2.0" [10]. (only PXB
4220/4221)
The CBR circuits are converted into ATM constant bit-rate virtual channels using the
ATM Adaptation Layer type 1 (AAL1) as defined in I.363.1, “B-ISDN ATM Adaptation
Layer Specification, Types 1 and 2" [31] or without any ATM Adaptation Layer overhead,
which will be referred as AAL type 0 throughout the rest of this document.
The IWE8 provides the segmentation and reassembly function.
Both the “Unstructured DS1/E1 Service” and the “Structured DS1/E1 N x 64 kbit/s Basic
Service” as described in the “Circuit Emulation Services Version 2.0" by the ATM Forum
in [10] are supported. For simplicity reasons the shorthand notation “Unstructured CES”
will be used to identify the “Unstructured DS1/E1 Service” while the “Structured DS1/E1
N x 64 kbit/s Service” will be referred to as “Structured CES” throughout the rest of this
document.
Data Sheet
14
2003-01-20