User manual

Making Network Connections
23
NXA-ENET24 Hardware Installation Guide
Making Network Connections
Connecting Network Devices
The PoE switch is designed to be connected to 10 or 100 Mbps network cards in PCs and servers, as well
as to other switches and hubs.
If 802.3af-compliant PoE devices are connected to the switch’s 10/100 Mbps ports, the switch
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 PoE switch 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 switch delivers power to a device using the two unused wire pairs in UTP or STP cable (RJ-45 pins
4, 5, 7, and 8). 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 switch 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).
See “Cables” on page 31. for further information on cabling.
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 normal 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.