ADTRAN ISU 2X64 user manual Dial Interface Connection
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Chapter 3.Installation
DIAL INTERFACE CONNECTION
If out-of-bandRS-366 dialing is required for applications such as videoconferencing or FAX machines, the dialing interfaces of the host DTE should be connected to the dial ports marked RS-366.
Pin assignments for the RS-366 connector are listed in the appen- dix, Connector Pinouts.