Enterasys Networks Enterasys Gold Distributed Forwarding Engine 4H4284-49 - Manual (Page 48)

Connecting to the Network
3-18 Installation
4. Verify that a link exists by checking that the port RX (Receive) LED is ON (flashing
amber, blinking green, or solid green). If the RX LED is OFF and the TX (Transmit)
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 button to step to the group of interest (Groups 1 through 4).
Each time the GROUP SELECT button is pressed, the GROUP LED lights up in
sequence, indicating which Group is selected. The receive and transmit activity
for that group of segments is then indicated by the RX and TX LEDs for each
segment.
b. Verify that the cabling being used is Category 5 UTP with an impedance between
85 and 111 ohms. If the port is to operate at 100 Mbps, category 5 cabling must be
used.
c. Verify that the device at the other end of the twisted pair segment is on and
properly connected to the segment.
d. Verify that the RJ21 connector on the twisted pair segment has the proper pinouts
and check the cable for continuity.
e. Check that the twisted pair connection meets the specifications in the Cabling
Guide.
If a link is not established, contact Enterasys Networks. Refer to “Getting Help” on
page xviii for details.
5. Repeat all the steps above until all RJ21 connections are made.
Connecting Fiber-Optic Cables to 4H4284-49
This section provides the procedures to connect fiber‐optic cables from the 100BASE‐FX,
MT‐RJ front panel ports of the 4H4284‐49
to the network or other devices. Each fiber‐optic
link consists of two fiber‐optic strands within the cable: Transmit (TX) and Receive (RX)
The transmit strand from a DFE‐Gold module port connects to the receive port of a fiber‐
optic 100BASE‐FX Ethernet device at the other end of the segment. The receive strand of
the applicable MT‐RJ port on the DFE‐Gold module connects to the transmit port of the
fiber‐optic 100BASE‐FX Ethernet device.
To connect a fiber‐optic cable segment to the module, refer to Figure 3‐11 and proceed as
follows:
1. Remove the protective covers (not shown) from the MT‐RJ front panel connector and
from the connectors on each end of the cable.
Note: An odd number of crossovers (preferably one) must be maintained between devices
so that the transmit port is connected to the receive port of the other device and vice versa.