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Chapter 3. Installation
61202.029L2-1 ISU 128 User Manual 13
MAINTENANCE INTERFACE
The Maintenance Interface is available at 9600 bps, 8 data bits, no parity, asyn-
chronous format, through the RS-366/Maintenance port. See the appendix
Connector Pinouts for Maintenance port pin assignments. The VT 100 terminal
or null modem can be connected to the RS-366/Maintenance port using an
EIA-232 cable. This interface can be used to set internal S-registers, dial ISDN
connections, and disconnect calls. This port also allows ADTRAN Technical
Support personnel to retrieve vital information from the unit if a problem is
encountered during initial configuration of the ISU 128. Most problems can be
solved without resorting to this port for assistance.
In order to activate the Maintenance port, ensure the dial mode is either Front
Panel or AT commands. When the dial mode is set for RS-366, the Mainte-
nance port is disabled.
The Maintenance port cannot be used to pass data or to remotely configure another
ISU 128 using the Cfg. Rmt. Unit option.
AT commands sent to the Maintenance port are not preceeded by "AT."
Example: To display the unit model number, enter: I0