Digital Equipment DECconcentrator 500, Installation Manual, Page: 24 / 98

1–4 DECconcentrator 500 Installation
1.5 Controls and Indicators
The controls and indicators are located on the main frame of the DECconcentrator
500 unit and on the option cards (see Figure 1–1). The light emitting diode (LED)
indicators provide operational and fault status.
Figure 1–1: DECconcentrator 500 Controls and Indicators
LKG–5114–91I
= Port status LED
= Fault LED
= Connectors
DECconcentrator
TM
500
Network
Management
Card
Port
cards
Ring
operational
LED
Controller/backplane
fault LED
Fan fault LED
Power supply DC
OK LED
OBM 25-pin
D-subminiature
connector
Network Management Card
configuration switches
Switch 1 (left): reset to factory defaults
Switch 2 (right): write access enable/disable
AC power
Circuit breaker
Multimode Network
Management Card
optical bypass connection
Connector reserved
for Digital
manufacturing