Chapter 3: Installing the IRM3
Page 3-10
IRM3 User’s Guide
3.5.2 Connecting to the Network Through the
Fiber Optic Port
When connecting a fiber optic link segment to the IRM3 Fiber Optic
ports, you must keep the following in mind:
•
ST connectors attach to ST ports much like BNC connectors attach to
BNC ports. The connector is inserted into the port with the alignment
slot on the connector inserted into the alignment key on the port. The
connector is then turned clockwise to lock it down.
•
The physical communication link consists of two strands of fiber optic
cabling: the Transmit (TX) and the Receive (RX). The Transmit strand
from the fiber optic port on the module will be connected to the
Receive port of a fiber optic Ethernet device at the other end of the
segment. The Receive strand of the fiber optic port on the module will
be connected to the Transmit port of the fiber optic Ethernet device.
•
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. If you did not purchase your cable from Cabletron Systems,
be sure to label your cable in this manner.
Connect a fiber optic link segment to an IRM3 FOIRL Fiber Optic port by
performing the following steps:
1. Remove the protective plastic covers from the fiber optic ports and
from the ends of the connectors on each fiber strand.
2. Attach the fiber labeled 1 (Figure 3-6) to the receive port, labeled RX,
on the module.
3. Attach the fiber labeled 2 to the transmit port, labeled TX, on the
module.
!
C AUT IO N
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 problems in data
transmissions. If the ends become contaminated, clean them
with denatured alcohol using a soft, clean, lint free cloth.
