Cisco Cisco Explorer Set-top Software Version 2.1 Guia Do Utilizador

Glossary

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reverse path

A physical connection between a DHCT and a hub in which the reverse path can support

multiple reverse data channels

Radio frequency. The range of electromagnetic frequencies above the audio range and below

infrared light. Most wireless transmission uses RF, including radio, TV, satellites, portable

phones, cellular phones, and wireless networks.

SAM

Service Application Manager. Associates a specific service with an application that defines the

medium to be used for that service, such as the World Wide Web. The SAM maintains the

application in a specific directory to be used when needed by the DHCTs.

sampling

A digital process by which analog information is measured in order to convert analog data to

digital data

SARA

The set of operating programs that is “permanently” loaded into the DHCT. These programs

are immediately available to the subscriber upon activation of the DHCT.

SDV

Switched Digital Video. SDV is a technology that allows cable operators to recover bandwidth

from infrequently-viewed channels, by making these channels "on-demand." Instead of

sending all channels to the set-tops, lightly viewed channels are put into a switching pool and

are only sent to the set-tops when viewers tune to them.

SER

Severe errors

server, MR-DVR

A MR-DVR DHCT that connects to client DHCTs and allows them to play back previously

recorded content from the server DHCT.

System information. A standard set of tables providing the data necessary for a navigation

device to discover and access services.