Cisco Cisco IOS Software Release 12.0(21)S1

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1-Port Channelized OC-48/STM-16 ISE and 4-Port 
Channelized OC-12/STM-4 ISE Line Cards for the 
Cisco 12000 Series Router
This document describes the software configuration of the 1-Port Channelized OC-48/STM-16 ISE and 
4-Port Channelized OC-12/STM-4 ISE line cards on the Cisco 12000 Series Router.
Feature History
Finding Support Information for Platforms and Cisco IOS Software Images
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Contents
Release
Modification
12.0(21)S1, 12.0(21)ST
This feature was introduced.
12.0(32)S
Added non-support for DS3 loopbacks to Footnote 1 in Table 2.
12.0(32)S11
Added feature for reporting defects that are cleared before the expiry of the 
delay timer on a 1-Port Channelized OC-48/STM-16 ISE line card.
12.0(33)S4
Updated details on configuring delay timer on a SONET controller.