Chapter 3. Installation61200051L1-1D ISU 2x64 Dual Port ISDN Service Unit User Manual 15MAINTENANCE INTERFACEThe Maintenance interface is available at 9600 bps, 8 data bits, noparity, no flow control, asynchronous format through the Mainte-nance port. See Connector Pinouts on page 119 for the pinout ofthe Maintenance port. A VT 100 terminal or null modem can beconnected to the Maintenance port using an EIA-232 cable. Thisinterface can be used to set internal S-registers, dial ISDN connec-tions, and disconnect calls. This port also allows ADTRAN Tech-nical Support personnel to retrieve vital information from theunit if a problem is encountered during initial configuration ofthe ISU 2x64. Most problems can be solved without resorting tothis port for assistance.The ISU 2x64 Maintenance Help Screen can be activated by typ-ing !? at either the DTE#1 or DTE#2 prompt. The screen is shownin Figure 3-1.Figure 3-1VT 100 Maintenance Help Screen
