MAYAH Merk II, Руководство пользователя

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Table of Contents
Centauri user manual revision level 01 /2007
81
Glossary
AAC Advanced Audio Coding;
Clipping level The clipping level shows when the A/D converter overdrives. In Ger-
many a clipping level of 15 dBu is usually used.
Clipping level (15 dBu) = norm level (6dBu) + headroom (9 dBu)
FTP FTP stands for File Transport Protocol and serves the processing of
files in a network. FTP superimposes on the Transmission Control
Protocol (TCP).
The MERK II has an FTP Server that permits file access to the MERK
II Flashmemory. This way, firmware updates can be installed on the
MERK IIs easily and securely.
G.711 Coding procedure for data reduction; is used by all ISDN telephones
G.722 Coding procedure with a bandwidth of 7kHz (better audio quality)
HTTP Abbreviation for Hypertext Transfer Protocol ; works in the OSI layer
7.
H.221 A protocol with which two devices swap information about which cod-
ing procedure they master, and how the data flow is distributed in the
case of several ISDN lines. An ITU (Internationale Telekommunika-
tion Union) standard to guarantee the compatibility between devices
made by different manufacturers.
IP Internet Protocol
Multiplexing In principle there are two different procedures for multiplexing.
The first method compensates the time delay between two channels
by transmitting and measuring a test pattern. If the connection path
changes during transmission it leads to breakdowns, and it is neces-
sary to set up a connection again. This method is called BONDING
and is mainly used in the data communication field. In audio,
principally by Dialog4, MusikTaxi, VP and VP-Pro.
The second method (INVERSE MULTIPLEXING) uses a small
portion of the data rate for semi- continuous checking of the delay.
This method is used with J.52 and for CCS Audio Codecs, such as
the CDQPRIMA for example.
ISDN Integrated Services Digital Network; a service-integrated digital net-
work.
J.52 Digital transmission procedure for sound programs for high quality,
that use one, two or three 64 kbit/s channels for mono and up to 6 for
stereo;
MPEG “Motion Pictures Expert Group”; data format for transmission.
SMTP Abbreviation for Simple Mail Transport Protocol .
SNMP SNMP is the abbreviation for Simple Network Management Proto-
co l and represents a standardized interface for the management of
network devices. All the parameters of a device can be set via this
interface and all statuses can be requested. These individual param-
eters are referred to as SNMP objects that are put together in the
Management Information Base (MIB).
The Merk II support this protocol optionally.
TCP TCP stands for Transmission Control Protocol and organizes a se-
cure data transfer via a network, comparable with a point-to-point
Audio
Anc Data
Audio
Audio
Encoder
Invers.
Multi
plexer
Anc Data
Audio
Decoder
Invers.
Multi
plexer
Transmission
Facilities
T