Comtech EF Data CDM-570/570L Vipersat - Manual (Page 189)

Appendix E - Glossary E-11
T
TAP Transmission Announcement Protocol – A proprietary multicast message sent
out by the HCC to all associated Remotes in the group, specifying the relative
start time and duration for each terminal to transmit while in Entry Channel
mode (ECMv2).
TCP/IP Transmission Control Protocol / Internet Protocol – A standard for networking
over unreliable transmission paths. See also UDP.
TDM Time Division Multiplexing – A method of multiplexing that provides the
transmission of two or more signals on the same communication path or chan-
nel, but at different times by utilizing recurrent timeslots.
TDMA Time Division Multiple Access – A multiple access technique where users
contend for access to a common channel on a time-shared basis. See also FDMA
and STDMA.
TFTP Trivial File Transfer Protocol – A simple file transfer protocol used over reli-
able transmission paths. See also FTP.
ToS Type of Service
Tx Transmit
U
UDP User Datagram Protocol – A standard for networking over reliable transmission
paths.
UDP
Multicast
A multicast transmission using the UDP protocol.
Unicast Transmitting information/data packets to a single destination on the IP network.
V
VCM Variable Coding and Modulation – A technique that optimizes bandwidth utili-
zation in a wireless data link by varying the forward error correction code rate
and the modulation order within a single carrier. A feature of DVB-S2 that is
supported in CEFD modems such as the CDM-800 Gateway Router.