S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
2
Features
The PM7348 S/UNI-IMA-4 is a monolithic integrated circuit that implements the ATM Forum
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-4 supports 4 independent T1, E1 or unchannelized physical links via a
clock/data interface. Each link is dynamically configurable to support either IMA 1.1,
backward compatible IMA 1.0, or ATM HEC cell delineation. ATM over fractional T1/E1 is
also supported. Unchannelized links may be used to support applications such as G.SHDSL or
ADSL.
Standards Supported
Sꢀ ATM Forum Inverse Multiplexing for ATM Specification Version 1.1, March 1999.
Sꢀ 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.
Sꢀ I.432-1 B-ISDN user network interface – Physical Layer specification: General
characteristics.
Sꢀ I.432-3 B-ISDN user network interface – Physical Layer specification: 1544 kbps and
2048 kbps operation.
Sꢀ ATM on Fractional E1/T1, af-phy-0130.00 October, 1999.
IMA Features
MA 1.1 protocol including group and link state machines implemented by on-chip
hardware.
o
The S/UNI-IMA device performs all ICP cell processing internally with no
requirement for microprocessor intervention; however, ICP cells are made available
for diagnostic purposes.
Sꢀ Supports up to 4 simultaneous IMA groups.
Sꢀ Each IMA group can support any number of supported links.
Sꢀ Each link can be programmed for either IMA processing or cell delineation.
Sꢀ Supports all IMA Group Symmetry modes:
o
o
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Symmetrical configuration with symmetrical operation.
Symmetrical configuration with asymmetrical operation.
Asymmetrical configuration with asymmetrical operation.
Sꢀ Performs IMA differential delay calculation and synchronization.
o
Provides programmable limit on differential delay tolerance and minimum number of
links per group.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
18
PMC [ PMC-SIERRA, INC ]
