4-1
Chapter 4: Making Network Connections
Connecting Network Devices
The ES4524M-PoE units are 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.
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 compliant.
Note: 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.
The switch delivers power to a device using wire pairs in the connecting UTP or STP
cable. The switch can provide up to 15.4 W of power continuously on each 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.
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).
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