S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
Sꢀ Supports up to 282 ms (for T1 links) and 226 ms (for E1 links) link-differential delay
among links in an IMA group.
Sꢀ Performs ICP and stuff-cell insertion and removal.
Sꢀ Supports both Common Transmit Clock (CTC) and Independent Transmit Clock (ITC)
transmit ICP stuffing modes.
Sꢀ Supports IMA frame lengths (M) equal to 32, 64, 128, or 256.
Sꢀ Optionally supports the IMA 1.0 method of reporting Rx cell information as defined in
appendix C.8 of the ATM Forum Inverse Multiplexing for ATM Specification Version 1.1
for symmetrical configurations; also optionally supports the IMA 1.1 method of reporting
Rx cell information when sending and receiving the IMA 1.0 OAM Label.
Sꢀ Provides IMA layer statistic counts and alarms for support of IMA Performance and
Failure Alarm Monitoring and MIB support.
Sꢀ Provides per link counters for statistics and performance monitoring:
o
o
o
o
o
o
ICP Violations.
OIF anomalies.
Rx Link stuff events.
Tx Link stuff events.
User cells.
Filler cells.
Sꢀ Provides per group counters for statistics and performance monitoring:
o
o
o
o
User cells received.
Filler cells received.
User cells transmitted.
Filler cells transmitted.
TC Features
Sꢀ Performs cell delineation on all links.
Sꢀ Performs receive cell Header Error Check (HEC) checking and transmit cell HEC
generation.
Sꢀ Optionally supports receive cell payload unscrambling and transmit cell payload
scrambling.
Sꢀ Provides TC layer statistics counts and alarms for MIB support.
Interface Support
Sꢀ Clock/Data Interface:
o
Supports 4 individual serial (T1 or E1 or unchannelized rates up to 8 Mbps) links via
a 2-pin line interface.
o
Supports ATM over fractional T1/E1 by providing the capability to select any DS0
timeslots that are active in a link.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
19
PMC [ PMC-SIERRA, INC ]
