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Glossary
Glossary-4
Private Branch Exchange (PBX)
A telephone exchange local to a particular organisation who use, rather than
provide, telephone services.
POTS
Plain Old Telephone Service.
Redundant Power Unit (RPU)
A backup power supply that automatically takes over in case the primary power
supply should fail.
RJ-45 Connector
A connector for twisted-pair wiring.
Splitter
A filter to separate DSL signals from POTS signals to prevent mutual interference.
Switched Ports
Ports that are on separate collision domains or LAN segments.
Transmission Control Protocol/Internet Protocol (TCP/IP)
Protocol suite that includes TCP as the primary transport protocol, and IP as the
network layer protocol.
UTP
Unshielded twisted-pair cable.
VDSL
Very high data rate Digital Subscriber Line: A family of digital telecommunications
protocols designed to allow high speed data communication at data rates from 12.9
to 52.8 Mbps with corresponding maximum reach ranging from 4500 feet to 1000
feet of 24 gauge twisted pair cable over the existing copper telephone lines.
Virtual LAN (VLAN)
A Virtual LAN is a collection of network nodes that share the same collision domain
regardless of their physical location or connection point in the network. A VLAN
serves as a logical workgroup with no physical barriers, allowing users to share
information and resources as though located on the same LAN.