3Com NETBUILDER II Installation Manual page 6

1-2 C 1: O
HAPTER VERVIEW
LEDs
Table 1-1 Ethernet Module External Components
Component
Interface board
I/O bus interface and connectors
External transceiver and connectors Bayonet Neill-Concelman (BNC) connector and a 15-pin
Line interface and connectors
LEDs
Table 1-2 Ethernet Module Internal Components
Component
Core memory peripheral interface
(CMPI)
Controller
Electrically erasable programmable
read only memory (EEPROM)
Soft-start circuit
The Ethernet module's connector/LED panel has three LEDs for displaying status
information: Activity (TX), AUI /BNC, and STATUS.
The AUI/BNC LED is active when the AUI connector is selected as the active Ethernet
interface. When the BNC connector is selected, the LED is not active.
Table 1-3 lists the states for each LED and their meanings.
Table 1-3 Ethernet Module LED Assignments
LEDs State
STATUS Off
Red
Green
Yellow
ACTIVITY Off
Green
AUI/BNC Off
Green
Description
IEEE 802.3 Ethernet Version 2 interface board with its own
bus.
The connector, miscellaneous discretes, and the core memory
peripheral interface (CMPI).
Attachment Unit Interface (AUI) connector.
Includes the on-board transceiver for a BNC connector. The
15-pin AUI connector requires an external transceiver.
Status indicators for the Ethernet module.
Description
Interface between the controller chip to the NETBuilder II
high-speed bus.
Provides the basic data link controller functions.
Contains product information and repair data on the
Ethernet module. Refer to the NETBuilder II Base System
Installation Guide for details on accessing EEPROM
information.
Supports the hot-swap feature (described in Table 1-4).
Indicates
Module is not functioning; for example, it is disabled, or there
is no power to the system.
Reset, error condition, or self-test failure (red light appears to
be blinking when self-test fails, as system intermittently
checks the status)
Module is functioning normally
Module is in self-test mode
No activity on the network
Network activity; module is functioning normally (the green
light appears intermittently, whenever data is transmitting)
BNC connector selected
AUI connector selected