CHAPTER 2
2-14 IEN HARDWARE REFERENCE 940043-002
Front Panel
The front panel of the IEN 4000 chassis contains the status indicator nomenclature for each
port and power supplies. Refer to Chapter 3, Port Processors for more information about
status indicators. Figure 2-8 illustrates the front panel of the IEN 4000 chassis.
Figure 2-8 IEN 4000 Front Panel
SBUS
TX
The Standard Bus Transmit is an LED indicator that indicates the unit is transmitting data to
the standard packet bus.
HiBUS
ACT
The High Speed Bus Activity is an LED indicator that indicates the port is transmitting data
on the high speed bus. Older Z80 port processors do not have high speed bus capability.
This indicates low speed bus activity on the Z80 port processor.
SBUS
RX
The Standard Bus Receive is an LED indicator that indicates the unit is receiving data from
the standard packet bus.
USER
PORTS
The User Ports is an LED indicator that indicates a signal from the DCE (modem or printer)
to the DTE, indicating it is receiving a carrier signal from the DCE at the other end of the
telephone circuit.
STAT The Status (STAT) is a seven-segment LED display that provides a current operational status
of the port processor.
Power 1 and 2
-12 Volts
The LED indicates that -12V is supplied by the power supply.
Power 1 and 2
+12 Volts
The LED indicates the +12V is supplied by the power supply.
Power 1 and 2
+5 Volts
The LED indicates that +5V is supplied by the power supply.
Power 1 and 2
System Clock
The LED indicates that the system clock is active.
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