Digital Equipment DECconcentrator 500, Installation Manual, Page: 25 / 98

Introducing the DECconcentrator 500 1–5
Table 1–1 describes the DECconcentrator 500 controls. Table 1–2 describes
the function of each LED.
Table 1–1: DECconcentrator 500 Controls
Control Description
AC power socket Provides connection to ac power source.
Circuit breaker Provides overcurrent protection for the concen-
trator. The white center of the circuit breaker
pops out if the circuit breaker trips. The ac pow-
er is cut off to the concentrator when the circuit
breaker trips. Pressing the white center resets
the circuit breaker. The circuit breaker trips at 4
amps.
Out-of-band management
connector Provides remote management through con-
nection directly to a terminal or through a mo-
dem to a terminal. Refer to Chapter 4.
Optical bypass connector Provides connectivity of the FDDI ring in the ab-
sence of power or during fault conditions of a
node. The connector is located on the Multi-
mode Network Management Card.
Table 1–2: DECconcentrator 500 Indicators
Icon LED I/O Panel Color
Normal
State
Description
Controller/
Backplane fault Unit Red OFF If ON, there is a fault with the
controller/backplane. In this
case the concentrator will not go
online in the network.
Power supply
DC OK Unit Green ON If OFF, there is a problem with
the power supply.
Fan fault Unit Red OFF If ON, there is a problem with the
fans.