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Chapter 3. Operation
61200.076L2-1 TSU 600 User Manual 41
• Test (yellow)
Indicates that one of the interfaces is operating in a
test mode. This includes a self test or a test loop-
back. When lighted, this LED also indicates that
normal data flow is not occurring in at least one of
the module ports.
• Alarm (red)
Indicates an alarm condition has been detected.
When the alarm condition is no longer valid, the OK
LED activates (turns on). To view an alarm condi-
tion, select the active alarm menu item or select
Alarm by pressing shift 8. If the alarm conditions
have been corrected, the alarm which caused the
activation of the Alarm LED can be viewed under
the Unit History menu.
LCD Window
A 2x16 character backlit LCD window displays menu
items used in the configuration of the unit. It also
displays alarm and status information.
CSU Status
Indicates the status of the network interface located on
the controller board in the unit. These LEDs show the
same indication as the Module, with the addition of
the Error LED. The Error LED indicates an error such
as BPV, OOF, or CRC error.
Operation Keys
Copy
Used in the DS0 mapping menu operations to copy the
last data entered into the current DS0. This key
operates without pressing the Shift key.
Remote
Reserved for future use.
Home
Used to return home to the Main menu from any
menu location.