Enterasys Networks Enterasys Platinum Distributed Forwarding Engine 7G4285-49 - Manual (Page 45)

Connecting to the Network
DFE-Platinum Series Hardware Installation Guide 3-13
Connecting UTP Cables to DFE Modules
The fixed RJ45 front panel connections of the 7G4285‐49 and 7G4205‐72 are 10/100/
1000 Mbps ports. These ports have internal crossovers, and 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 RJ45 fixed front panel connectors of the 7G4285‐49 and 7G4205‐72 also support
PoE‐compliant connections to PDs (powered devices) that require 48 Vdc through the
UTP cable to operate. When 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
To connect and verify UTP cable connections to RJ45 ports (1 through 48 or 72), refer to
Figure 3‐4 and proceed as follows:
1. Ensure that the device connected to the other end of the segment is powered ON.
2. Insert the RJ45 connector on the twisted pair segment into the appropriate RJ45 port
connector.
Note: All RJ45 front panel ports on these DFE modules 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 or 72) 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 o 72) a segmentos que vayan de un edificio a otro. Mantenga las conexiones de
los equipos dentro del edificio.