Comtech EF Data Vipersat Circuit Scheduler v3.7.x ArrangeLink - Manual (Page 85)

Appendix A - Glossary A-9
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
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.
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.
Upstream In the direction of the network Hub site.