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The ADTRAN ISDN Service Unit (ISU) is a standalone device that connects data terminal equipment (DTE) to the ISDN network. The ISU 128 is a full featured single-port terminal adapter that allows cost-effective high-speed data transmission at rates up to 128 kbps. The ISU 128 is ideal for LAN/WAN connectivity or disaster recovery. ISDN service is delivered from the network by a single 2-wire U-interface which is connected directly to the ISU 128. The ISU 128 responds to loopback commands from the telephone company Central Office to make testing easy. The ISU 128 allows the user to migrate ISDN into existing network service and data communications equipment. The ISU 128 interoperates with V.34 modems (optional) and switched 56 DSUs, as well as various ISDN terminal adapters, inverse multiplexes and multilink PPP compatible routers. The ISU 128 transmits data over an RS-530, EIA-232 or V.35 DTE interface. The ISU 128 performs at synchronous data rates of 2400 bps to 128 kbps and asynchronous rates of 300 bps to 115.2 kbps. At rates over 64 kbps, multilink PPP or the Bonding delay equalization protocol synchronizes data over the two 64 kbps B channels. The ISU 128 also supports dedicated leased 2B1Q services. This provides a dedicated point-to-point service with no dialing necessary. The front panel of the ISU 128 stand alone consists of a two-line by 16-character display, seven LEDs, and a 16-button keypad. Configuration, testing and monitoring of the unit can be accomplished through the front panel, a VT-100 screen connected to the maintenance port, or remotely over the ISDN line. Features
ISU 128 APPLICATION EXAMPLE
ISU 128 ALTERNATE VIEWS
Product Specifications
Ordering Information
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