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3.
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 (see Figure
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 RJ45 connectors on the twisted pair segment have the proper pinouts and
check the cable for continuity. Typically, a crossover cable is used between hub devices. A
straight‐through cable is used to connect between switches or hub devices and an end
user (computer). Refer to Figure 3‐9 and Figure
to Figure 3‐11 and Figure
Figure 3-9
Crossover 4-Wire Cable RJ45 Pinouts, Connections Between Hub Devices
Ã
1
RJ45 device port
2
Other device port
Figure 3-10
Straight-Through 4-Wire Cable RJ45 Pinouts, Connections
Between Switches and End User Devices
Ã
1
RJ45 device port
2
Other device port
3‐8) to step to the group of interest (Groups 1 through 4). Each
3‐12 for eight‐wire RJ45 connections.
À
Â
3
RJ45-to-RJ45 crossover cable
4
RX+/RX- and TX+/TX- connections. These
connections must share a common color pair.
À
Â
3 RJ45-to-RJ45 straight-through cable
4 RX+/RX- and TX+/TX- connections. These connections
must share a common color pair.
Connecting to the Network
3‐10 for four‐wire RJ45 connections. Refer
Á
Á
Matrix DFE-Diamond Series Installation Guide 3-15
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Table of Contents
Troubleshooting
