Ethernet Network Adapter Installation Guide

Page 3-6
MAKING NETWORK CONNECTIONS
3.3 CONNECTING TO A FIBER OPTIC LINK SEGMENT
The physical communication link consists of two fiber optic
strands between the adapter and the other Ethernet fiber optic
device on the link: Transmit (TX) and Receive (RX).
The adapter Tx connects to Rx of the Ethernet device. The adapter
Rx connects to Tx of the Ethernet concentrator. We recommend
that you label the fiber optic cable to indicate which fiber is
Receive and which is Transmit. When you buy fiber optic cable
from Cabletron Systems, it is labeled so that at one end of the
cable, one fiber is labeled 1, and the other fiber is labeled 2. This
pattern is repeated at the other end of the cable.
ST connectors (Figure 3-4) attach to ST ports in the same way that
BNC connectors attach to BNC ports. The connector is inserted
into the port with an alignment slot on the connector inserted into
the alignment key on the port. The connector is then turned until it
is locked.
NOTE: Do not touch the ends of the fiber optic strands and do not let the
ends come in contact with dust, dirt, or other contaminants.
Contamination of the ends can cause data transmission problems.
If the ends become contaminated, clean them with denatured alcohol
using a soft, clean, lint free cloth. If this does not work, use a fiber optic
polishing kit to polish the end of the strand.
To connect to a fiber optic segment, attach the fiber labeled 2 to the
adapter’s transmit port (light gray) (1). At the other end of the
fiber optic cable, attach the fiber labeled 1 to the transmit port of
the applicable device. Attach the fiber labeled 2 to the receive port
of the fiber optic device.
At this time you should check to see that the adapter’s Link LED is
lit. If the LED is not lit, verify that the power is on for the PC, and
check that the power is turned on for the device at the other end of
the fiber optic link.