Cisco Cisco Explorer Set-top Software Version 2.2 用户指南
Glossary
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DVR
digital video recorder. A device that records television programs without the use of videotape
and saves them to a hard drive located inside the recorder. The programs can then be
deleted, saved to a tape, or left on the hard drive. A DVR allows you to pause live broadcast
for interruption, such as creating your own instant replays. Also known as PVR.
DVR HDD
DVR hard disk drive.
E
E-MAC
Ethernet media access.
EAID
Equipment authorized in-use detail.
EAS
Emergency Alert System. A warning system that is activated at the headend and broadcasts
emergency messages to subscribers.
ECM
Entitlement Control Message. System-wide information that “unlocks” an encrypted service
by transmitting control words. Each ECM is unique for each service. An ECM enables
cryptographic partitioning so that different Entitlement Agents (EAs) can selectively grant
access to their own services.
EMM
Entitlement Management Message. Contains information for a specific DHCT that enables it
to access secure services.
encoder
A device that converts an analog signal into a digital signal.
encryption
The process of converting plain text into a coded signal for security.
EQ Gain
QAM equalizer gain.