Polycom VIEWSTATION Training Manual page 41

End-User Training Guide: ViewStation
QCIF
– Quarter Common Intermediate Format. A video resolution of / the
size of FCIF – 176 pixels horizontally and 144 pixels vertically. It is used
primarily in low bite rate (128 kbps and lower) videoconferencing.
RBOC
– Regional Bell Operating Company; controls a grouping of local
exchange carriers.
Resolution
– A measure of sharpness or clarity on a monitor.
RSVP
– Resource Reservation Protocol. An emerging data network standard
protocol used to reserve bandwidth within packet networks. It is primarily
used in data network routers to guarantee a fixed bandwidth through the
router for a single or group of users using real time data (like voice or video).
All other traffic not assigned to the reservation (such as e-mail or Web
access) is delivered by best effort by the router (as it is today).
RS-232
– Connectivity from the codec permitting data inputs for
transmission from .3 to 190.2 kbps.
RS-449
– Transmission interface between the codec and the transmission
link that typically connects to a T1 Multiplexer. A user RS-449 port may also
be available for data transfer.
SECAM
– French standard for analog video format.
SNMP
– Simple Network Management Protocol; the protocol governing
network management and monitoring of network devices and their functions.
SNMP came out of the TCP/IP environment.
Standards
– Uniform specifications to permit interoperability in
videoconferencing.
Switched 56
– Transmission network at 56 kbps that allows dial-up
videoconferencing. Because picture quality at 56 kbps is often not
acceptable, most dial-up videoconferencing takes place on two 56 kbps lines,
for a total of 112 kbps (see Dual 56).
TCP/IP
– The international standard protocol used on the Internet and
company data networks. It provides worldwide connectivity and includes
services such as the World Wide Web, e-mail, file transfer and remote
terminal login.
VSGi - Polycom ViewStation End-user Training Guide
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