The ADTRAN ISDN Service Unit (ISU™) 512 is a standalone device that connects data terminal equipment (DTE) to the ISDN network or to a leased digital network for data transmission. The ISU 512 is a basic inverse multiplexer that provides cost-effective high-speed data transmission for a single application at rates up to 512 kbps. This manual provides operating instructions for the device.
ISU 512 User Manual
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