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The Cisco 4-Port Clear Channel T1/E1 High-Speed WAN Interface Card provides n x T1/E1 connectivity in a compact form factor and reduces deployment and management costs for the Cisco 2800, 3800, 2900 and 3900 Series Integrated Services Routers.
Cisco 2800 Series Integrated Services Router:
2821, 2851Cisco 2900 Series Integrated Services Router:
2911, 2921, 2951Cisco 3800 Series Integrated Services Router:
3825, 3845Cisco 3900 Series Integrated Services Router:
3925, 3925E, 3945, 3945E