Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 543)

Appendix H - Glossary H-11
MN/22156, rev 12
Star
Topology
A network topology which, if drawn as a logical representation, resembles a star
with a hub at the center.
STDMA Selective Time Division Multiple Access – A multiple access technique where
users time-share access to a common channel with variable-sized time slots
allocated on usage.
Streamload
Protocol
A proprietary Vipersat data streaming protocol.
SUM Status Update Message – A packet message that is sent by newer Vipersat
modems (e.g., SLM-5650A) to the VMS every sixty seconds, providing status
update and operating parameter information.
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.