PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
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
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
3
PMC [ PMC-SIERRA, INC ]
