Glossary T
Centillion 1200N ATM Switch User Manual B-77
NTP 297-8103-903
TCP
Transmission Control Protocol: Originally developed by the Department of
Defense to support interworking of dissimilar computers across a network. A
protocol which provides end-to-end, connection-oriented, reliable transport layer
(layer 4) functions over IP controlled networks. TCP performs the following
functions: flow control between two systems, acknowledgements of packets
received and end-to-end sequencing of packets.
TCP
Test Coordination Procedure: A set of rules to coor dinate the t est p rocess betwee n
the lower tester and the upper tester. The purpose is to enable the lower tester to
control the operation of the upper tester. These procedures may, or may not, be
specified in an abstract test suite.
TCR
Tagged Cell Rate: An ABR service parameter, TCR limits the rate at which a source
may send out-of-rate forward RM-cells. TCR is a constant fixed at 10 ce lls/second.
TCS
Transmission Convergence Sublayer: This is part of the ATM physical layer that
defines how cells will be transmitted by the actual physical layer.
TDF
An ABR service parameter, TDF controls the decrease in ACR associated with
TOF. TDF is signaled as TDFF, where TDF = TDFF/RDF ti mes the smallest power
of 2 greater or equal to PCR. TDF is in units of 1/seconds.
TDFF
Refer to TDF. TDFF is either zero or a power of two in the range 1/64 to 1 in un its
of 1/cells.
TDM
Time Division Multiplexing: A method in which a transmission facility is
multiplexed among a number of channels by allocating the facility to the channe ls
on the basis of time slots.
TE
Terminal Equipment: Terminal equipment represents the endpoint of ATM
connection(s) and termination of the various protocols within the connection(s).