
Glossary
© 2013 Harmonic Inc.
400
Ellipse 3000 r.3.0, Rev. B
unbalanced audio
Audio that has a single output with respect to ground; that is, the output is not transmitted
differentially.
See also
.
UNI
ATM user-network interface. The logical demarcation point between service users’
equipment and network providers’ equipment.
Uploading configuration
Sending the configuration to the device.
upstream
Refers to the direction of the communications service flow. The return communications path
traverses upstream from the subscriber to the service provider.
URI
Uniform Resource Identifier.
URL
Uniform Resource Locator.
USB
Universal Serial Bus.
UTP
Unshielded Twisted Pair.
V
VAM
Video Access Manager.
VANC
Vertical Ancillary data space. During the vertical interval of each field or frame, the ancillary
data space located between SAV and EAV markers. Digital information can be transmitted
efficiently in VANC (as opposed to VBI), since only the direct bits are sent. There are SMPTE
standards documenting the carriage of most services originally carried in VBI.
VBI
Vertical Blanking Interval. This is the space between the end of the vertical synchronization
pulses and start of the active video (lines 10 to 21 for
, and lines 6 to 22 for
). Digital
information can be transmitted during this time when encoded as waveforms. Examples of
signals transmitted in the VBI include teletext, AMOL, and CEA-608 closed captions.