Specifications

Main Board Indicators
See the drawing on the facing page in reference to the descriptions
below.
D1 - D8 YELLOW ADDRESS BUS ACTIVITY
These LEDs show activity on the eight MSBs of the Address
bus.
D9 GREEN VIDEO STANDARD
When this LED is lit, 525-line operation is selected. If it is
off, 625-line operation is selected.
D10 GREEN RUN
This LED is normally lit while the switcher processor is
active, and goes off while the processor is halted.
D11 GREEN SWITCHER PROC ADDRESS STROBE
This LED lights to indicate that the switcher processor
address strobe is active.
D12 GREEN DEBUG PORT TX
Factory test only.
D13 YELLOW DEBUG PORT RX
Factory test only.
D14 GREEN CONTROL PANEL PORT TX
This LED normally flashes to indicate that the Signal
Chassis is transmitting data to the Control Panel.
D15 YELLOW CONTROL PANEL PORT RX
This LED normally flashes to indicate that the Signal
Chassis is receiving data from the Control Panel.
D16 GREEN SCSI ACTIVITY
This LED flashes to indicate that the 8150 is accessing its
SCSI hard disk drive.
D17 GREEN COMM PROC ADDRESS STROBE
This LED lights to indicate that the communications
processor address strobe is active.
Signal Chassis 8150 Technical Guide
4-4
System Overview
9100-0212-04 - May 2000