ISU 2x64-S Adtran Dual Port ISDN Service Unit

The Adtran ISU 2x64 Series Dual Port ISDN Service Units are standalone ISDN Service Units that connect data terminal equipment to the ISDN network. The ISU 2x64 is a dual port ISDN Terminal Adapter. The unit provides a cost-effective solution for the transfer of data and images over a single ISDN line.

The ISU 2x64 can be viewed as a dual modem that supports two applications, simultaneously and independently, up to 64 kbps on each DTE interface. For high speed applications over 64 kbps, a single DTE interface can achieve rates up to 128 kbps. Target applications for the unit include video conferencing and audio broadcasting at 128 kbps, as well as dual modem replacement.

The ISU 2x64 features dual RS-530/RS-232 DTE interfaces and dual RS-366 dial interfaces. An RS-530A/RS-232-toV.35 adapter is available to support V.35 DTE interfaces.

A single DTE interface supports synchronous data transfer rates from 2400 bps to 128 kbps and asynchronous rates from 1200 bps to 115.2 kbps. When using dual DTE interfaces, synchronous data transfer rates from 2400 bps to 64 kbps and asynchronous rates from 1200 bps to 57.6 kbps are supported. For speeds over 64 kbps using a single DTE interface, the industry standard BONDING delay equalization protocol or Multilink PPP aggregates the two 64 kbps B channels for a maximum of 128 kbps.