Installation guide

Connecting to the Network
Matrix DFE-Gold Series Modules Installation Guide 3-23
1. 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. To view the receive and transmit activity on a group of segments, press the
GROUP SELECT switch (see Figure 3-15) to step to the appropriate group. Each
time the GROUP SELECT switch is pressed, the GROUP LED lights up in
sequence, indicating which Group is selected. On the 4H4284-49, you can step to
1, 2, 3, or 4 for Groups 1 through 4. The receive and transmit activity for that
group of segments is then indicated by the RX and TX LEDs for each segment.
b. If there are separate fiber-optic connections on the other device, check the
crossover of the cables. Swap the cable connections if necessary.
c. Verify that the fiber connection meets the dB loss and cable specifications for
multimode cabling, as outlined in the Cabling Guide.
If a link is not established, see Chapter 4 for troubleshooting information before
contacting Enterasys Networks. To contact Enterasys Networks, refer to “Getting Help”
on page 1-10 for details.
Connecting Fiber-Optic Cables to 7G-6MGBIC
This section provides the procedure for connecting 1-Gigabit Ethernet fiber-optic
segments from the network or other devices to Mini-GBIC MT-RJ or LC port connectors
installed in the optional 7G-6MGBIC interface. An MT-RJ connector is shown in
Figure 3-16 and an LC connector is shown in Figure 3-17.
Each fiber-optic link consists of two fiber-optic strands within the cable:
Transmit (TX) and Receive (RX)
The transmit strand from an MT-RJ port on the DFE-Gold module interface connects to
the receive port of a fiber-optic Gigabit Ethernet device at the other end of the segment.
The receive strand connects to the transmit port of the fiber-optic Gigabit Ethernet device.
The following procedure describes how to connect an MT-RJ cable connector (Figure 3-16)
to a Mini-GBIC port connector. This procedure also applies to an LC cable connector
shown in Figure 3-17. Refer to Figure 3-16 as an example and proceed as follows:
1. Remove the protective covers (not shown) from the MT-RJ fiber-optic port on the
Mini-GBIC and from the connectors on each end of the cable.
Note: Leave the protective covers in place when the connectors are not in use to prevent
contamination.
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 cable ends causes
problems in data transmissions. If the ends of the fiber-optic strands become
contaminated, use a canned duster to blow the surfaces clean. A cleaning swab saturated
with optical-grade isopropyl alcohol may also be used to clean the ends.