Cabletron Systems ESX-1320 User Manual

Each fiber optic link consists of two strands of fiber optic cabling: the 
transmit (TX) and the receive (RX). The transmit strand from a module 
port connects to the receive port of a fiber optic Ethernet device at the 
other end of the segment. The receive strand of the applicable port on the 
module connects to the transmit port of the fiber optic Ethernet device.

Cabletron Systems recommends labeling fiber optic cables to indicate 
receive and transmit ends. Many cables are prelabeled, providing 
matching labels or tapes at both ends of each strand of cable.

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.

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 cable ends causes problems in data 
transmissions. If necessary, clean contaminated cable ends 
using alcohol and a soft, clean, lint-free cloth.

TX+

TX–

RX+

RX–

2

1

3

6

TO

10BASE-T Device

Port

TX+

TX–

2

1

3

6

NOTE:
RX+/RX– and TX+/TX–
must share a common
color pair.

TO

ESX-1320

RJ45 Port

1574-30

RJ-45 to RJ-45

RX+

RX–