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1.4 Safety Summary
The U4650 is designed for safe use with few special precautions required of
the user. The following items are basic precautions to use when installing and
working with your U4650:
Do not open the U4650 chassis cover.
The U4650 incorporates security labels over some of the screws. There are no
user-serviceable components within the U4650. Tampering with these security
labels or opening the unit will void your warranty. If you have questions, con-
tact Wegener's Customer Service Department at the address or numbers listed
in Chapter 5 Customer Service on page 83.
1.5 Glossary of Terms and Abbreviations
Term
Ad avail, digital
The opportunity for a local program splicer to insert local content in the MPEG PES
streams in substitution for "regular" network-distributed programming. The avail is
bounded by "splice out" and "splice in" points. "Splice points" are seamless insertion
points (located for the splicer by DPI messages) where the compressed stream may be
broken and substituted without frame-by-frame interruption of video.
Ad avail, analog
The opportunity for local users to switch from the network-supplied programming to
locally-generated content (commercials). This is signaled by use of DTMF tones or clo-
sures of cue relays.
Alarm
A condition or notification of a condition that prevents proper U4650 functioning.
Application Software
The main host software which sets up the unit hardware, runs the process of acquiring
transport stream sources, sets up and monitors the demux and decompression processes,
monitors unit operations, and interfaces with the network and local users.
ASI (or DVB-ASI)
An "asynchronous" bit-serial physical interface for transport streams. Transmitting and
receiving functions are designed such that the time relationships between all packets and
their timing references are unchanged.
Aspect ratio (of video)
The ratio of horizontal to vertical width in the expected video presentation monitor.
wegener.com
Table 3: Glossary of Terms
Definition
19
Unity 4650 User's Manual
800034-01 Rev. A
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