Glossary | U |
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TSI
Telecommunications Standards Institute: The primary telecommunications standards organization
TTC
Telecommunications Technology Council: A Japanese standards committee.
TTCN
Tree and Tabular Combined Notation: The internationally standardized test script notation for specifying abstract test suites. TTCN provides a notation which is independent of test methods, layers and protocol.
TTL
Transitor transitor logic
U
UBR
Unspecified Bit Rate: An ATM service category which does not specify traffic related service guarantees. Specifically, UBR does not include the notion of a per- connection negotiated bandwidth. No numerical commitments are made with respect to the cell loss ratio experienced by a UBR connection, or as to the cell transfer delay experienced by cells on the connection.
UCFAD
Universal Cell Frame Assembly/Disassembly
UDP
User Datagram Protocol: This protocol is part of the TCP/IP protocol suite and provides a means for applications to access the connectionless features of IP. UDP operates at layer 4 of the OSI reference model and provides for the exchange of data grams without acknowledgements or guaranteed delivery.
UL
Underwriting Laboratory: A privately owned company that charges manufacturers a stiff tee to make sure their products meet the safety standards which UL itself develops. A UL label on a product has a very specific message. It says the product conforms to the safety standards UL has developed, nothing more. It does not affirm that the product will work.
Centillion 1200N ATM Switch User Manual | |
NTP |
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