Chapter 3: Installation
3-12 2E48-27R/2E49-27R User’s Guide
2. Connect the twisted pair segment to the module by inserting the RJ45
connector on the twisted pair segment into the RJ45 port on the
module shown in Figure 3-7.
3. Verify that a link exists by checking that the port RX LED is on
(flashing amber, blinking green, or solid green). If the RX LED is off
and the TX LED is not blinking amber, perform the following steps
until it is on:
a. Verify that the 100BASE-TX device at the other end of the twisted
pair segment is powered up.
b. Verify that the RJ45 connector on the twisted pair segment has the
proper pinouts.
c. Check the cable for continuity.
d. Make sure that the twisted pair connection meets the db loss and
cable specifications outlined in Section 2.4.
e. Confirm that the crossover switch is in the correct position.
If a link is not established, contact the Cabletron Systems Global Call
Center. Refer to Section 1.5 for details.
3.4.3 Connecting a Fiber Optic Segment to theFE-100FX and FE-100F3The FE-100FX and FE-100F3 have an SC style network port (see
Figure 3-9). Cabletron Systems supplies fiber optic cable that uses SC
style connectors, which are keyed to ensure proper crossover of the
transmit and receive fibers.
NOTES An odd number of crossovers (preferably one) must be
maintained between devices so that the transmit port of one
device is connected to the receive port of the other device and
vice versa.
If the fiber optic cable being used has SC style connectors that
do not resemble MIC style connectors, or has SC connectors
on one end and a different type on the other, such as ST
connectors, ensure that the proper crossing over occurs.