chair site A site that has chair control rights.
D
DMZ Demilitarized Zone
A buffer area between an insecure system and the secure system and
is used to solve the problem that the external network equipped with a
firewall cannot access the internal network server. The DMZ is
located between the internal network and the external network. In the
DMZ, some public server facilities, such as the enterprise Web server
and FTP server, can be located. The DMZ effectively protects the
internal network.
DNS Domain Name System
A mechanism of mapping easy-to-remember domain names to IP
addresses recognizable for network devices.
DST Daylight Saving Time
DTMF Dual Tone Multiple Frequency
Multi-frequency signaling technology for telephone systems.
According to this technology, standard set combinations of two
specific voice band frequencies, one from a group of four low
frequencies and the other from a group of four high frequencies, are
used.
E
EUA Enterprise Unified Address Book
A next-generation address book server launched by Huawei. It
provides LDAP-based unified address book services for Huawei
videoconferencing and enterprise communication solutions.
G
G.722 Audio codec standard that uses adaptive differential pulse-code
modulation (ADPCM). Its data rate is 48 kbit/s, 56 kbit/s, or 64 kbit/s.
G.728 Audio codec standard that uses low-delay code excited linear
prediction (LD-CELP). Its data rate is 16 kbit/s.
H
H.239 A standard recommended by ITU-T. It enables a video conference to
have simultaneous transmission of both video and data content (for
example, computer desktop).
H.263 A video codec standard for video conferences at low rates. Five
formats are available, SQCIF, QCIF, CIF, 4CIF, and 16CIF.
H.264 Compared with H.263, H.264 can provide the same-quality video at
half of the bit rate, with strong error resilience characteristics.
TE30 Videoconferencing Endpoint
Product Overview
A Glossary
Issue 03 (2018-06-30) Copyright © Huawei Technologies Co., Ltd. 41
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