Amazon.com: Cisco Systems NIM-8MFT-T1/E1 8 Port Multiflex Trunk Voice/Clear-CH Data : Electronics
C-DTU, Single Port, E1/T1 (PRI) Digital Card for IP PBX-C302/C503 - FS.com
E1/T1 Interface Card-Loop Telecom
Amazon.com: Cisco 8. Port Channelized E1/T1 Port Adapter . For Data Networking . 8 X Channelized E1/T1/Isdn. Pri Wan . 2.05 Mbps E1, 1.54 Mbps T1 "Product Type: Routing/Switching Devices/Modules" : Electronics