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Chapter 1
Product Overview
1.2.3.14 Redundancy in Subtended Configurations
NI-2 card redundancy is supported in an E3 subtend tree or daisy-chain or in an OC-3c subtend
daisy-chain if both the subtending host chassis and the subtended node chassis have primary and
secondary NI-2 cards installed. An NI-2 card failure on a node in a subtend tree or daisy-chain
temporarily interrupts traffic to all subtended node chassis.
NI-2 card redundancy is not supported in DS3+T1/E1 IMA subtended configurations.
APS link redundancy is supported in subtending configurations only if all of the following conditions
exist:
1.
2.
3.
1.2.4 Cisco 6260 I/O Modules
This section contains the following information:
•
•
•
A Cisco 6260 chassis must have an I/O module installed. The I/O module is delivered installed near the
top of the Cisco 6260 chassis, just below the subscriber connectors.
I/O module on the Cisco 6260 chassis.
1.2.4.1 E3 I/O Module Overview
The E3 I/O module provides the Cisco 6260 chassis with a network trunk interface connector and
connectors to subtend other DSLAMs to the chassis. The E3 I/O module also provides the alarm pinouts
and BITs clock input circuits for the Cisco 6260 system.
The E3 I/O module works with the DS3/2DS3 NI-2 card in the Cisco 6260 chassis.
Note
Figure 1-19
OL-2365-02
The subtending host chassis is configured for OC-3c/OC-3c operation;
The subtending host chassis has a secondary NI-2 card installed; and
The subtended node chassis have primary and secondary OC-3c/OC-3c NI-2 cards installed.
E3 I/O Module Overview, page 1-41
E1 I/O Module Overview, page 1-42
OC-3c I/O Module Overview, page 1-43
The Cisco 6260 does not support the DS3 interface. When the DS3/2DS3 NI-2 card is installed in
the Cisco 6260 chassis with an E3 I/O module, the NI-2 card adopts E3 functionality.
shows a close-up of the E3 I/O module.
Cisco 6260 System Overview
Figure 1-1
shows the location of the
Cisco 6260 Hardware Installation Guide
1-41
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