Specifications

Table Of Contents
Terminology
39
Router
A device that forwards data packets from one local area network (LAN) or wide area network (WAN)
to another. Based on routing tables and routing protocols, routers read the network address in each
transmitted frame and send it based on the most expedient route. In SSWEB, the Liebert gateways
route BACnet over IP traffic from one segment to another.
SNMP
Simple Network Management Protocol; a protocol to manage devices. SNMP sends traps that signify
alarm conditions within a device. It uses other commands to allow control and to monitor a device.
STP
Shielded Twisted Pair cable is protected with an aluminum or copper sheet or stranding to reduce
electromagnetic interference. Twisted strands in the cable cancel out the effects of electromagnetic
frequency caused by current flowing through each wire in the cable.
STP Plenum Cable
is Shielded Twisted Pair with insulation that will not produce poisonous fumes if it burns, as national
codes require for cable installed in an air duct. STP Plenum cable also is protected with an aluminum
or copper sheet or stranding to reduce electromagnetic interference. Twisted strands in the cable can-
cel out the effects of electromagnetic frequency caused by current flowing through each wire in the
cable.
URL
Uniform Resource Locator, the global address of documents and other resources on the World Wide
Web. The first part of the address indicates what protocol to use, and the second part specifies the IP
address or the domain name where the resource is located. For example, the following URL specifies a
Web page that is be fetched using the HTTP protocol:
http://www.pcwebopedia.com/index.html
UTP
Unshielded Twisted Pair cabling is not shielded against electromagnetic interference. Twisted
strands in the cable cancel out the effects of electromagnetic frequency caused by current flowing
through each wire in the cable.
UTP Plenum Cabling
Unshielded Twisted Pair Plenum cabling has insulation that will not produce poisonous fumes if it
burns, as national codes require for cable installed in an air duct. The cabling is not shielded against
electromagnetic interference. Twisted strands in the cable cancel out the effects of electromagnetic
frequency caused by current flowing through each wire in the cable.