ADTRAN 1200051L6 - Manual (Page 22)

Chapter 1.Understanding ISDN and the ISU 2x64
8 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1D
1. All asynchronous rates support flow control.
2. All dial-up modes support front panel, DTR, RS-366, AT
command, and V.25 dialing methods.
3. Rates marked with f require flow control.
4. Given a choice between two protocols, pick the protocol closer
to the top of the list.
5. Rate marked with v is available on Port 2 only.