User manual

Chapter 3. Operation
3-8 TDU 120e User Manual 61202156L1-1
FRONT PANEL
The TDU 120e front panel monitors operation and controls
the configuration of the unit. The TDU 120e front panel is
shown in Figure 3-4.
Figure 3-4. TDU 120e Front Panel Layout
Descriptions of each part of the front panel follow.
ACO Switch
The Alarm Cut-Off 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
reenergize.
Remote LED
The remote LED (yellow) indicates a management session
(terminal mode or telnet) is active. The LED does not activate
(turn on) during SNMP sessions.
Craft Port
The Craft Port is used as an EIA-232 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.
ACO
REMOTE
ACCESS
CRAFT
TD
U
1
20
eA
C
NETWORK MON
IN OUT
IN OUT
IN OUT
IN OUT
PORT 0.2 MON
IN OUT
IN OUT
PORT 1.1 MON
TEST
OK
YEL
RED
ALARM
ERROR
NETWORK STATUS
TEST
OK
ALARM
PORT STATUS
0.1
0.2
1.1
1.2
1.3
1.4
Alarm
Cut Off
Control Port
Active Unit
Network
Monitor Jack
Connection
For
Terminal
DS-1
Monitor Jack
Network
Status LED's
Port Status
LED's
Port 1.1
Option Card
Monitor Jacks