User`s guide

Chapter 1: Introduction
Page 1-4 IRM3 User’s Guide
1.3 IRM3 FRONT PANEL
The IRM3 incorporates two ports that connect to external network
segments:
• One pair of IEEE 802.3 FOIRL fiber optic ports. The fiber optic ST
port accommodates a wide variety of multimode fiber optic cable,
including 50/125
µ m, 62.5/125 µ m, and 100/140 µ m fiber optic cable,
up to 2 km in length.
• An IEEE 802.3 compliant AUI port. The AUI port allows you to
connect the module to a variety of Ethernet transmission media
including twisted pair, fiber optic, and/or thick or thin Ethernet coaxial
cable by way of an external transceiver.
Either one of these ports can act as the repeater port to the external
network. When the IRM3 is first powered up, the AUI port acts as the
repeater port and the fiber ports are off. Using the IRM3 network
management capabilities (see Chapter 4,
Local Management ), you can
reverse this configuration to have the fiber port act as the repeater port and
have the AUI port off. This configuration allows you to connect the IRM3
to a fiber optic link segment directly without having to use an external
fiber optic transceiver.
The IRM3 also provides the option, through remote management, to set
one port as the active repeater port and the other port as a redundant
repeater port.
Built into the front panel of the IRM3 are two standard 9-pin RS232
console ports labeled CONSOLE and UPS. The CONSOLE port enables
you to access the IRM3/LM locally or remotely using a Hayes compatible
modem. If you are using a CS-600R/CS-1250R series Uninterruptible
Power Source (UPS), the UPS port enables you to monitor and control the
UPS through the IRM3 using SPECTRUM Element Manager for
Windows or SPECTRUM. The front panel also has a reset switch to
initialize the IRM3 processor.
The IRM3 incorporates the Cabletron Systems LANVIEW Status
Monitoring and Diagnostic System. If a problem arises, such as a power
failure or a cable fault, the LANVIEW LEDs (see Section 5.1,
Using
LANVIEW
) help you to diagnose it.