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Cisco Channelized T1/E1 and ISDN PRI Network Module – ISDN terminal adapter – expansion slot – ISDN PRI – 2.048 Mbps – T-1/E-1 – digital ports: 8 (128 channels) – refurbished – for Cisco 3825, 3825 V3PN, 3845, 3845 V3PN, 3925, 3945