Enterasys Networks Enterasys Gold Distributed Forwarding Engine 4H4285-49 - Manual (Page 41)

Connecting to the Network
Matrix DFE-Gold Series PoE Module 4H4285-49 Installation Guide 3-13
Connecting to the Network
This section provides the procedures for connecting unshielded twisted pair (UTP)
segments from the network or other devices to the 4H4285‐49 (
“Connecting UTP Cables to
4H4285‐49” on page 3‐13).
Connecting UTP Cables to 4H4285-49
The fixed RJ45 front panel connections of the 4H4285‐49 are 10/100 Mbps ports. The ports
have internal crossovers, and also support automatic‐polarity sensing when configured
for automatic‐negotiation.
If automatic‐negotiation is not activated on a port, use a straight‐through cable when
connecting a workstation to the port. When connecting a networking device to the port,
such as a bridge, repeater, or router, use a crossover cable.
If a port is set for auto‐negotiation, automatic‐polarity sensing is also activated.
Automatic‐polarity sensing eliminates the need for a crossover cable, regardless if the
connection is to another network device or a workstation.
The fixed RJ45 front panel connectors of the 4H4285‐49 also support PoE‐compliant
connections to PDs (powered devices) that require 48 Vdc through the UTP cable to
operate. Whether the 48 Vdc is available through the backplane of an N5 chassis or
externally from an N‐POE Power System, you can verify if there is power at each port as
described later in this procedure.
Making the UTP Connections
Note: If the DFE module is being installed in a network using Link Aggregation, there are
rules concerning the network cable and port configurations that must be followed for Link
Aggregation to operate properly. Before connecting the cables, refer to the Enterasys
Matrix DFE-Gold Series Configuration Guide for the configuration information. For details
on how to obtain manuals, refer to
“Related Documents” on page xvi.
Note: All RJ45 front panel ports on the 4H4285-49 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.
Caution: To prevent damage to the equipment, do not connect the PoE supported ports
(1 through 48) to segments running between buildings. Keep connections to equipment
within the building.
Precaución: Para evitar que el equipo se dañe, no conecte los puertos PoE
(1 a 48) a segmentos que vayan de un edificio a otro. Mantenga las conexiones de los
equipos dentro del edificio.