Connecting to Modem Connecting to the Network
Enterasys A4 Fast Ethernet Switch Hardware Installation Guide 2-21
Connecting UTP Cables to RJ45 Ports
The fixed RJ45 front panel 10/100 Mbps ports support Auto MDIX, which means that you can use
straight-through or crossover twisted pair cabling.
To connect twisted pair segments to the switch, refer to Figure 2-13 and proceed as follows:
1. Ensure that the device to be connected at the other end of the segment is powered on.
2. Connect the twisted pair segment to the switch by inserting the RJ45 connector on the twisted
pair segment into the desired RJ45 port on the A4 switch.
Figure 2-13 Connecting a UTP Cable Segment to an RJ45 Port
3. Verify that a link exists by checking that the Link/Activity LED is on (solid green or blinking
green). If the Link/Activity LED is off, perform the following steps until it is on:
a. Verify that the cabling being used is Category 5 or better with an impedance between 85
and 111 ohms with a maximum length of 100 meters (328 feet).
b. Verify that the device at the other end of the twisted pair segment is on and properly
connected to the segment.
c. Verify that the RJ45 connectors on the twisted pair segment have the proper pinouts and
check the cable for continuity.
4. If a link is not established, contact Enterasys Networks. Refer to “Getting Help” on page xvii
for details.
Repeat all steps above until all connections have been made.
Note: All fixed RJ45 front panel ports support Category 5 Unshielded Twisted Pair (UTP) cabling
with an impedance between 85 and 111 ohms. Category 3 cable may be used if the connection is
going to be used only for 10 Mbps.
1 RJ45 cable connector 2 RJ45 front panel port 3 Front panel port Link/Activity LED
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