Comtech EF Data SLM-5650A Vipersat Parameter Editor - Manual (Page 73)

Appendix A - Glossary A-9
S
SCPC Single Channel Per Carrier – A satellite communications technique where an
individual channel is transmitted to the designated carrier frequency. Some
applications use SCPC instead of burst transmissions because they require guar-
anteed, unrestricted bandwidth.
SIP Session Initiation Protocol – A general purpose protocol for multimedia
communications, commonly used for voice over IP (VoIP) signaling. An alter-
native to the H.323 protocol.
SNG Satellite News Gathering – A satellite uplink van/truck with television crew on
location conducting a live report for a newscast.
SNMP Simple Network Management Protocol – A protocol defining how devices from
different vendors may be managed using a common network management
system.
SOTM Satellite On-The-Move – The ability of a mobile remote terminal to roam
across satellite beams to preserve link integrity and to automatically connect
from one satellite and/or hub to another in a global network.
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.