CONNECTING TO THE NETWORK
Page 4-6
• The physical communication link consists of two strands of
fiber optic cabling: the Transmit (TX) and the Receive (RX). The
Transmit strand from the applicable port on the module will be
connected to the Receive port of a fiber optic Ethernet device at
the other end of the segment. For example, TX of the applicable
port on the module will go to RX of the other fiber optic device.
The Receive strand of the applicable port on the module will be
connected to the Transmit port of the fiber optic Ethernet
device. For example, RX of the applicable port on the module
will go to TX of the other fiber optic device.
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. If you did not purchase your cable from Cabletron
Systems, be sure you label your cable as described above.
Caution: 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 alcohol using a soft, clean, lint free cloth.
To connect a fiber optic link segment to an EPIM-F1, EPIM-F2, or
EPIM-F3:
1. Remove the protective plastic covers from the fiber optic ports on
the applicable port on the module and from the ends of the
connectors on each fiber strand.
2. Attach the fiber labeled 1 to the applicable receive port, labeled RX,
on the module. See Figure 4-4.