61200051L1-1D ISU 2x64 Dual Port ISDN Service Unit User Manual 1Chapter 1Understanding ISDN and the ISU 2x64ISDN OVERVIEWThe Integrated Services Digital Network (ISDN) is a public or pri-vate switched digital network. ISDN is an international standardfor digital communications, allowing a full range of enhanced ser-vices supporting voice, data, and image applications throughstandard interfaces over a single pair of telephone wires. ISDNprovides a means of integrating these services and modernizingcommunication networks for information movement and man-agement efficiency.THE ADTRAN ISU 2X64ADTRAN’s ISU™ 2x64 is a stand-alone ISDN service unit thatconnects data terminal equipment to the ISDN network. The ISU2x64 is a dual-port ISDN terminal adapter available with an op-tional integrated NT1. The ISU 2x64 supports two applications atdata rates of up to 64 kbps on each DTE interface, or one applica-tion using a data rate greater than 64 kbps (maximum 128 kbps)on a single DTE interface. Target applications for the ISU 2x64 in-clude video conferencing, audio broadcasting, and as dual mo-dem replacement.
