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Appendixes
IP-900 Series
127
which has a fixed length of 188 bytes. The TS
method is used for transmission in an
environment such as ATM communication or
digital broadcasting where errors can occur.
TSC (Transport Scrambling Control)
A field in MPEG-2 TS header information,
which indicates the scrambling mode of a
stream. The TSC of a stream that is encrypted
with the BISS method is defined as 2.
TTL (Time To Live)
Abbreviation of Time To Live, which indicates
the survival time of a packet on a network. If a
packet sent to a network happens to enter a loop
because of a setting error on a router, it will not
survive forever, but will be discarded when the
specified survival time is reached.
TTS (Time stamped Transport Stream)
192byte packet consist of basic 188byte MPEG
TS and 4byte-timestamp counted by 27MHz
clock.
UDP (User Datagram Protocol)
Abbreviation of User Datagram Protocol. UDP
is a TCP/IP transaction protocol used for
specific applications such as remote network
management and naming service access.
Unicast
Communication with a station at a single
address (that is, most general one-to-one
communication.)
USB (Universal Serial Bus)
One of the serial bus standards for connecting
peripheral devices to a PC. The first USB1.0
was developed in 1996. Today, USB2.0 provides
greater enhancement in transfer speed and load
reduction, which made it spread rapidly and
became the most commonly used standard for
PC environment.
UTP Cable
UTP is an abbreviation of unshielded twisted
pair. A UTP cable is an unshielded pair of wires
twisted together, and is used for Ethernet
cabling and other purposes.
UTC (Coordinated Universal Time)
International standard time. The UTC is
calculated based on the time measured by an
atomic clock, which uses the second in the SI
unit system as a reference value, making
adjustments that insert leap seconds to
compensate for the time difference from
Greenwich Mean Time (GMT.)
Video User Data
Data area standardized by H.264 video
encoding method that user can use arbitrarily for
data transmission.
VITC (Vertical Interval Time Code)
Time code signal embedded in the vertical
blanking area of video sync signal.
10BASE-T
LAN that uses unshielded twisted-pair (UTP)
cables and complies with the IEEE 802.3
standard. 10Base-T connection is made simple
by using a concentrator called a hub without any
special cabling work required. For this reason,
10Base-T is the most widely used form. The
maximum cable length is 100 meters.
100BASE-TX
One of the 100Base LAN standards (also
called Fast Ethernet.) 100Base-TX supports
transfer rates of 100 megabits per second.
Other 100Base standards are 100Base-T4 and
100Base-FX. 100Base-TX differs from the other
100Base standards in the type of cable used
(UTP cable.) It also uses RJ-45 connectors,
which are similar to the modular jacks used for
telephones.
1000BASE-T
One of the Gigabit Ethernet standards which
have the maximum 1Gps speed. It was
standardized as IEEE802.3ab in 1999. This is
the standard that uses the UTP cable of the
category 5 (CAT5) or the enhanced category 5