Chapter 4: Making Network Connections; Connecting Network Devices; Twisted-Pair Devices; Power-Over-Ethernet Connections - LG-Nortel LNGS8MP Installation Manual

Chapter 4: Making Network Connections

Connecting Network Devices

The switch 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.
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 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.
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 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 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.
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