Cisco Cisco Explorer Set-top Software Version 2.1 User Guide

Glossary

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ESE

External secure element.

Explorer

Our registered trademark name for the Digital Home Communications Terminal (DHCT).

Also known as a set-top box.

FDC

Forward Data Channel. Carries digital data (tuning, management, Internet, and at least two

days of IPG data) in ATM cells on RF signals from the ATM switch to a router, which then

forwards the data to the correct network. Also known as out-of-band data channel.

FECM

Future entitlement control messages.

filter

A device that selectively sorts signals and passes them through a desired range of signals

while suppressing the others. This filter is used to suppress noise or to separate signals into

bandwidth channels.

flash ROM

A rewritable ROM that does not lose its information when the power turns off.

forward path

A physical connection from the hub to a DHCT that may support multiple analog

transmission channels, digital transmission channels, and forward data channels.

FPM

Forward purchase message.

frequency

The number of times an electromagnetic wave repeats an identical unit of time, usually one

second. One Hertz (Hz) is equal to one cycle per second.

gain

The extent to which an analog amplifier boosts the strength of a signal.