Adtec digital EN-91 / EN-91P (version 1.02.29) Manual - Manual (Page 10)

Audio Encode Indicators
Indicator Function
A1 through
A8 Off - Audio encoder configuration is set to off.
On - Audio encoder configuration is set to encode or passthru.
Note: This product offers optional extended audio encoding of the upper
four pairs. If you experience issues engaging the upper pairs, check your
feature keys first.
System Indicators
Indicator Function
Alarm Off - No system alarms.
On - System alarm.
(Typically NTP alarm)
BISS Off - No encryption set
On - Encryption active
Link Off - No network detected
On - Network communication active
Busy Off - No network activity
On - Network traffic present
Controls
Using the Mode, Select, Enter, Escape, and directional buttons, the user can control the unit
via the front panel.
Control Function
Mode button Mode will cycle you through top layer menus.
Select Select will enter you into edit mode.
Enter Enter submits any edits.
Escape Escape returns you to the previous menu layer.
Cursor Arrows Arrows will navigate you within submenus
Programming
Keypad For value entry. F2 functions as a “.” decimal or period.