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61202.029L2-1 ISU 128 User Manual 15
Chapter 4
Operation
MENU NAVIGATION
Four function keys on the left-hand side of the keypad allow the user to enter,
exit, and scroll through the various menu branches. The four function keys are
defined below.
Enter Enters the selected item.
Up Arrow Scrolls up a menu tree.
Down Arrow Scrolls down a menu tree.
Cancel Exits (back one level) from the current branch of
the menu tree.
For reading ease, function keys are represented in bold, initial caps text. Selectable
menu items and messages displayed on the LCD are represented in bold type as they
appear on the LCD.
Press either the Up or Down arrow to scroll through the menu tree. To choose
an item, press the corresponding number on the keypad. The item blinks to
show that it is selected and has been stored in non-volatile memory. Press En-
ter to select the item. Press Cancel to exit back through the menu tree.
It is important to note that some features in the ISU 128 do not immediately
take effect upon selection. This prevents unintentional reconfiguration of the
ISU 128 during an active call. Leased/Dial Line, and ISDN Switch Protocl,
take effect only when the ISU is powered up or the U-interface is bounced (line
broken and restored). To ensure the ISU is actually performing as configured,
cycle the power off, then back on again, after these items are changed. Also,
items such as Bit Rate, Protocol, and Call Type take effect only at the begin-
ning of a new call.