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Chapter 3. Operation
3-8 TDU 120e User Manual 61202156L2
ACO Switch
The Alarm Cut-Off (ACO) switch deactivates the alarm
relay after an alarm condition has occurred. If the alarm
that activated the alarm relay is cleared, then reoccurs, the
alarm relay will re-energize.
Remote LED
The remote LED (yellow) indicates a management session
(terminal mode or Telnet) is active. The LED does not ac-
tivate (turn on) during SNMP sessions.
Craft Port
The Craft Port is used as an RJ-45 port to connect the unit
to a computer, a modem, or to another TDU/TSU
multiplexor or a TSU 100.
Network Monitor Jack
This jack connects the unit to the network.
DS1 Monitor Jack
This jack connects the unit to a PBX or other terminal
equipment.