Comtech EF Data Vipersat CDM-570 User Manual page 188

RS-232
A common electrical/physical standard issued by the IEEE used for point to
point serial communications up to approximately 115 kb/s.
RTP Real-time Transport Protocol – A standardized packet format for delivering
real-time applications such as audio and video over the Internet. Frequently
used in streaming media systems, videoconferencing, and VoIP.
Rx
Receive
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.
SLM Satellite Link Modem (CEFD model designator; e.g., SLM-5650A)
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 SatCom-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 A network topology which, if drawn as a logical representation, resembles a star
Topology 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 A proprietary Vipersat data streaming protocol.
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.
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