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PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
PM7340 S/UNI-IMA-8
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
3
2
FEATURES
The PM7340 S/UNI-IMA-8 is a monolithic integrated circuit that implements the
Inverse Multiplexing for ATM (IMA 1.1) protocol with backward compatibility to
IMA 1.0 and the Transmission Convergence (TC) layer function. The S/UNI-
IMA-8 supports 8 T1, E1 or unchannelized links where each link is dynamically
configurable to support either IMA 1.1, backward compatible IMA 1.0, ATM over
T1/E1, ATM over fractional T1/E1 or ATM HEC cell delination for unchannelized
links Unchannelized links may be used to support applications such as ADSL.
Standards Supported
ATM Forum Inverse Multiplexing for ATM Specification Version 1.1, March
1999
ATM Forum Inverse Multiplexing for ATM Specification Version 1.0 – supports
the method of reporting Rx cell information as in Appendix C.8 of the ATM
Forum Inverse Multiplexing for ATM Specification Version 1.1 for symmetrical
configurations with M=128.
I.432-1 B-ISDN user network interface – Physical Layer specification: General
characteristics
I.432-3 B-ISDN user network interface – Physical Layer specification: 1544
kbps and 2048 kbps operation
ATM on Fractional E1/T1, af-phy-0130.00 October, 1999
IMA Features
IMA 1.1 protocol including group and link state machines implemented by on-
chip hardware.
Supports up to 4 simultaneous IMA groups.
Each IMA group can support any number of supported links.
Each link can be programmed for either IMA processing or cell delineation.
Supports all IMA Group Symmetry modes:
Symmetrical configuration with symmetrical operation