If you are using multiple 1- or 2-port T1/E1 modules for n x T1/E1 connectivity, you can now replace the modules with a single Cisco 4-Port Clear Channel T1/E1 HWIC, and you can make the HWIC slots available for other interfaces and services. If you use a single T1/E1 today and plan to scale up to 4 T1/E1 modules in the future, you can install the 4-port HWIC today and turn on the additional T1/E1 ports as you need them.
The Cisco 4-Port Clear Channel T1/E1 HWIC is software-configurable between E1 or T1 operation, balanced or unbalanced E1 termination, and CSU/DSU. You no longer need to buy a specific module for T1 support and then another card for E1 connectivity. If you have branch offices across the world, ordering, inventory and management are much simplified.
Cisco Integrated Services Routers: