PXB4219E Datasheet, PDF (21/290 Pages) Infineon Technologies AG – Interworking Element for 8 E1/T1 Lines

IWE8, V3.4
PXB 4219E, PXB 4220E, PXB 4221E
Overview
1.4
Differences Between PXB4220 And PXB4219
The IWE8 type PXB 4219 does only support the ATM mode used for ITU-T G.804
compliant ATM cell mapping into the plesiochronous digital hierarchy (PDH) at line rates
of 1544 kbit/s and 2048 kbit/s. The AAL mode is not available.
1.5
Differences Between PXB4220 And PXB4221
The IWE8 type PXB 4220 uses an internal clock recovery mechanism (SRTS) which is
patented by Bellcore. SRTS is supported for fully filled cells only.
Related Patents are:
• Bellcore patent No. 5,260,978
(Synchronous Residual Time Stamp for Timing Recovery in a broadband network)
• Bellcore patent No. 4,839,306
(Method and apparatus for multiplexing circuit and packet traffic)
Infineon Technologies is not allowed to collect SRTS license fees on the IWE8 on behalf
of Bellcore. Contacts for license issues are given in Chapter 13.
Every IWE8 customer must get in contact with Bellcore legal department by himself to
clarify whether his application needs to license the SRTS functionality.
For customers who do not want to use the built-in SRTS mechanism, Infineon provides
a special version of the IWE8. The name of this device is PXB 4221 and covers the same
functionality (pin and register compatible) like the PXB 4220. SRTS is physically and
permanently disabled, so that no patent fees have to be paid.
Data Sheet
21
2003-01-20