The versatility of Cisco 2610-51XM, 2800, 2691, 3660, 3700 and 3800 series routersis demonstrated by their broad support of E1/T1 connectivity and Integrated ServicesDigital Network Primary Rate Interfaces (ISDN PRI). Customers continue todeploy E1 and T1 circuits for Wide Area Network (WAN) connectivity, ISDN dial-backup,and digital modem termination in the Power Branch Office Environment. Cisconow makes it possible to terminate T1 and E1 PRI connections in a single networkmodule. Available in single and dual port models, the NM-1CE1T1-PRI and NM-2CE1T1-PRI cards coupled with Cisco 2610-51XM, 2800, 2691, 3660, 3700 and 3800 Seriesrouters, enhance and simplify customers' WAN connectivity optionsThe Cisco E1/T1 ISDN PRI Network Module's integrated channel service unit (CSU)provides direct connection to the Telecommunications network, thus allowing customers to consolidate customer premises equipment (CPE). This provides multifunction dial access aggregation, routing functionality, VPN and firewall security, and other capabilities right inside the Cisco router in power branch office environments.Both the 1-port and 2-port versions offer support for balanced and unbalancedE1 connectivity and conform easily to customers' specific applications.The Cisco E1/T1 ISDN PRI network modules also supply connectivity for internal digitalmodems in the Cisco 3660, 3700 and 3800 series routers, with connectivityoptions for PRI, T1 channel associated signaling (T1-CAS), and E1-CAS R2 signaling.This provides for a high concentration of V.92-compatible modems, while stillallowing expandability for other critical services. producing area:China