Chapter 4: Connecting to the Network
Page 4-8
MicroMMAC Installation Guide
4. At the other end of the fiber optic cable, attach the fiber pair to the
transmit and receive ports of the device.
If link indicators are present for the fiber optic connection, check that they
are ON. If an indicator is present but not ON, that port does not have a
valid link. Perform each of the following steps until you reach a resolution
of the problem and achieve a link.
•
Check that the device at the other end of the link is ON.
•
Verify proper cross-over of the fiber strands. Try swapping the transmit
and receive connections at only one end of the link.
•
Verify that the fiber connection meets the dB loss specifications
outlined in Appendix C, Network Planning and Configuration.
If you are still unable to establish a link, attempt to make the connection
between the devices with another fiber optic cable. If this is unsuccessful,
contact Cabletron Systems Technical Support.
4.1.5 Connecting a 10BASE-F Segment to an EPIM-F2 or
EPIM-F3
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.
