Alcatel-Lucent 1830 PSS-16 Maintenance And Trouble-Clearing User Manual page 718

Glossary
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traffic grooming
Traffic can be consolidated, aggregated, or separated to achieve efficiencies of routing.
Transmission Control Protocol (TCP)
A protocol used with the Internet Protocol to send data in the form of message units between
computers over the Internet. While IP handles the actual delivery of the data, TCP keeps track of
the individual units of data (called packets) that a message is divided into for efficient routing
through the Internet.
traps (SNMP)
SNMP traps are unacknowledged events sent from an agent to a manager. In a 1830
PSS-36/PSS-32/PSS-16/PSS-4 network, the agent is the node and the manager is EMS.
tunable optical add/drop multiplexer (TOADM)
A tunable ROADM that yields the ultimate in operational flexibility, especially when used in
conjunction with transponders with tunable wavelength lasers.
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U UDP
See "user datagram protocol" (p. GL-30)
UL
See "Underwriters Laboratories" (p. GL-30)
Underwriters Laboratories (UL)
A U.S. non-profit privately owned and operated product safety testing and certification
organization. Develops standards and test procedures for products, materials, components,
assemblies, tools and equipment, chiefly dealing with product safety.
unidirectional path-switched ring (UPSR)
A survivable, closed loop transport architecture that protects against cable cuts and node failures
by providing duplicate, geographically diverse paths for each service. Adjacent nodes on the ring
are interconnected using a single pair of optical fibers. One fiber transports traffic in one direction
(for example, clockwise), while the second fiber transports traffic in the opposite direction (for
example, counterclockwise). In a UPSR, the source node bridges its outgoing traffic along
opposite directions around the ring (on paths provided by SONET synchronous transport
channels). In contrast to BLSR, a UPSR:
•
is path-specific as opposed to line specific
•
does not allow extra traffic (because traffic is bridged)
•
requires less coordination from source to destination (because the destination network
element can make all its decisions without involving the source)
UPSR
See "unidirectional path-switched ring" (p. GL-30)
user datagram protocol (UDP)
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GL-30
for definition.
for definition.
for definition.
1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011