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edge switch 2/16 service manual Glossary–49
Glossary
terabyte
TB. One thousand (1,000) gigabytes; one terabyte of text on paper would consume 42,500
trees. At 12 characters per inch, 1 TB of data in a straight line would encircle the earth 56
times and stretch some 1.4 million miles equalling nearly three round trips from the earth to
the moon.
Threshold Alert Log
Director or switch Threshold Alert Log. Log displayed through the Product Manager
application that provides details of threshold alert notifications for an individual director or
switch. The log displays the date and time an alert occurred, and displays details about the
alert as configured for the product. The information is useful to maintenance personnel for
fault isolation and repair verification. See also Audit Log; Event Log; Hardware Log; Link
Incident Log.
TIA
See Telecommunications Industry Association.
topology
Logical and/or physical arrangement of stations on a network.
transceiver modules
Transceiver modules come in longwave, extra longwave, or shortwave laser versions,
providing a single fiber connection.
transfer rate
The speed with which data can be transmitted from one device to another. Data rates are often
measures in megabits (Mbps) or megabytes (MBps) per second, or gigabits (Gbps) or
gigabytes per second (GBps).
transmission control protocol
TCP. The transport layer for the transmission control protocol/Internet protocol (TCP/IP)
protocol widely used on Ethernet networks and any network that conforms to U.S. Department
of Defense standards for network protocol. TCP provides reliable communication and control
through full-duplex connections (D).
transmission control protocol/Internet protocol
TCP/IP. A layered set of protocols (network and transport) that allows sharing of applications
among devices on a high-speed local area network (LAN) communication environment (D).
See also transmission control protocol; Internet protocol.
trap
Unsolicited notification of an event originating from a simple network management protocol
(SNMP) managed device and directed to an SNMP network management station.