Roll Off
A gradual or sharp attenuation of gain at
either or both ends of a transmission pass
band.
SCAN
In the Stealth system, SCAN Mode shows on
one display the voltage levels of all carriers
across a given spectrum. Video and Audio
carrier levels are shown, separately, in dBmV.
SLM
Signal Level Meter
Slope
Difference in gain between the ends of a band
of frequencies
Suck-Out
Excessive cable transmission loss that affects
or several channels acutely, as a function of
frequency, due to sharp kinks or bends, or to
minor imperfections regularly spaced in the
line.
Sweeping
Injecting into the cable and transmitting
downstream in a CATV system at selected
points in the spectrum a series of output
signals that vary in frequency between preset
or adjustable limits, at a rate that is also
adjustable. Used in conjunction with suitable
peripheral equipment, the swept signal can be
used for comprehensive testing of a CATV
plant.
Sweepless
Mode
Passive examination of carrier frequencies.
TASO
Television Allocation Study Organization
TDMA
Time Division Multiple Access: an access
methodology that assigns bandwidth only
when/as required.
Telemetry
Frequency
Frequency selected to transmit data
downstream/upstream in a CATV system.
Tilt
Transmission loss in a coaxial cable. Tilt
increases in proportion to the square root of
frequency. Tilt compensation adjusts amplifier
frequency/gain response to offset tilt
attenuation. As displayed in a Stealth System,
TILT mode shows levels in dBmv across a
band of channels; TILT shows up as the slope
between lowest to highest channel. Levels for
each Intermediate channel should reach the
line from lowest to highest channel.