Panasonic 1200N User Manual

Telecommunications Standards Institute: The primary telecommunications 
standards organization

Telecommunications Technology Council: A Japanese standards committee.

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. 

Transitor transitor logic

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. 

Universal Cell Frame Assembly/Disassembly

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. 

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.