Tektronix AD007 - Manual (Page 58)

Reference
44 AD007 User Manual
Interpreting the Status Indicators
The status indicators on the AD007 adapter report the progress and
condition of power on self tests, network boot, and the normal traffic
to and from the network and GPIB. To determine the operating state
of the adapter, see Tables 2 and 3 to interpret the blinking patterns
and colors of the indicators.
Power
LAN-Link
LAN
GPIB
Figure 10: Status Indicators