3Com CoreBuilder 9000 Quick Start Manual page 14

14 20-Port 100BASE-FX (MT-RJ) Fast Ethernet Layer 2 Switching Module Quick Start Guide
Verifying Module
Operation
7 To secure the module front panel in the chassis, tighten the spring-loaded
screws at each end of the front panel to a torque specification of
3–5 inch-pounds.
CAUTION: To prevent damage to the module or to the chassis, make
sure that the screws are centered (aligned) with the holes in the chassis
before you tighten them.
If the slot to the right (in an 8-slot chassis or 16-slot chassis) or top (in a
7-slot chassis) of the module does not have a faceplate or a module
installed, gently push the module to the left (in the 8-slot chassis or
16-slot chassis) or downward (in the 7-slot chassis) to compress the
electromagnetic shielding gasket and properly align the screws with the
holes in the chassis.
WARNING: To ensure adequate cooling air flow and continued product
safety agency compliance, install blank faceplates over all empty slots.
The 20-port 100BASE-FX (MT-RJ) Fast Ethernet Layer 2 Switching Module
has one Module Status LED and 20 Port Status LEDs on the front panel.
The two ports on the back of the module do not have corresponding
LEDs.
Watch the LEDs during system power-on to verify proper module
operation:
On the Module Status LED, the normal power-on test sequence is:
Green – Yellow – Green – Flashing Green (while running the
diagnostic test) – Green
The Port Status LEDs are tested during the diagnostic test. The normal
test sequence is: Yellow – Green – Off