Section 38: Glossary
T
ieline
T E C H N O L O G Y
Page 334
MPEG
MPEG is the international standard for multimedia which
incorporates both audio and video encoding at a range
of data rates.
MP3
MPEG-1 Layer 3 is commonly used to compress sound
files to around one twelfth of the original size of the file.
O.B.
An Outside Broadcast or Remote Broadcast site external
to the studio.
Point-to-Multipoint
ISDN supports point-to-multipoint configurations, with
multiple but dissimilar CE devices connected to a single
line.
Point-to-Point
When a single ISDN device is connected to an ISDN line
i.e. one codec connected to another codec.
Remote
A Remote Broadcast or Outside Broadcast site external
to the studio.
Service Profile ID
Each telephone line is assigned a single directory
number. When a customer orders services or features
they are programmed into a Service Profile stored at the
switch. Any call associated with that line can be assumed
to apply only to that customer's Directory Number and
Service Profile. When a single ISDN device is connected
and serviced this way, the configuration is said to be
point-to-point.
Stub or Party Lines
In some countries, it was the practice to have more than
one phone service attached to one line. This is called a
Stub or Party Line. As more lines have been installed,
services have been separated but the redundant cabling
may remain connected across your line and it will cause
problems with operation of your codec.
S/T Interface
A Network Terminator 1 (NT-1) converts a two-wire U
interface into four-wire S/T interface which will allow the
use of multiple devices when using ISDN. (Common
outside North America)
TCP
A transport layer protocol which sends reliable in-order
data between hosts.
TDD
A technique used by cell-phone networks where the up
link and the down link use the same frequencies for
transmission.
UDP
A transport layer protocol which sends data between two
hosts which can be received out-of-order.
