Specifications

Network Planning
10
NXA-ENET8POE Gigabit PoE Ethernet Switch
Making Network Connections
Connecting Network Devices
The NXA-ENET8POE is designed to interconnect multiple segments (or collision domains). It can be
connected to network cards in PCs and servers, as well as to hubs, switches or routers. It may also be
connected to devices using optional SFP transceivers.
If 802.3af-compliant PoE devices are connected to the switch’s 10/100 Mbps ports, the NXA-ENET8POE
automatically supplies the required power.
Twisted-Pair Devices
Each device requires an unshielded twisted-pair (UTP) cable with RJ-45 connectors at both ends. Use
Category 5, 5e or 6 cable for 1000BASE-T connections, Category 5 or better for 100BASE-TX connections,
and Category 3 or better for 10BASE-T connections.
Power-over-Ethernet Connections
The NXA-ENET8POE automatically detects an 802.3af-compliant device by its authenticated PoE signature
and senses its required load before turning on DC power to the port. This detection mechanism prevents
damage to other network equipment that is not 802.3af complaint.
The NXA-ENET8POE delivers power to a device using wire pairs in the connecting Ethernet cable. The
switch can provide up to 15.4 W of power continuously on each 10/100 Mbps port. However, taking into
account some power loss over the cable run, the amount of power that can be delivered to a terminal device is
12.95 W. If a device draws more than 15.4 W, from a port, an overload condition occurs and the port
turns off the power.
The NXA-ENET8POE controls the power and data on a port independently. Power can be requested from a
device that already has a data link to the switch. Also, the switch can supply power to a device even if the
port’s data connection has been disabled. The power on a port is continuously monitored by the switch and it
will be turned off as soon as a device connection is removed.
Cabling Guidelines
The RJ-45 ports on the switch support automatic MDI/MDI-X pinout configuration, so you can use standard
straight-through twisted-pair cables to connect to any other network device (PCs, servers, switches, routers, or
hubs).
Connecting to PCs, Servers, Hubs and Switches
To connect the NXA-ENET8POE to individual PCs, servers, hubs, and switches:
1. Attach one end of a twisted-pair cable segment to the device’s RJ-45 connector.
2. If the device is a PC card and the switch is in the wiring closet, attach the other end of the cable segment
to a modular wall outlet that is connected to the wiring closet. Otherwise, attach the other end to an
available port on the NXA-ENET8POE. Make sure each twisted pair cable does not exceed 100 meters
(328 ft) in length.
3. As each connection is made, the Link LED (on the switch) corresponding to each port turns on to indicate
that the connection is valid.
Network Wiring Connections
The punch-down block is an integral part of many newer equipment racks. It is actually part of the patch panel.
Instructions for making connections in the wiring closet with this type of equipment follows:
1. Attach one end of a patch cable to an available port on the switch, and the other end to the patch panel.
Power-over-Ethernet connections work with all existing Category 3, 4, 5, 5e or 6
network cabling, including patch cables and patch-panels, outlets, and other
connecting hardware, without requiring modification.
Do not plug a phone jack connector into an RJ-45 port. This will damage the switch.
Use only twisted-pair cables with RJ-45 connectors that conform to FCC standards.