Mitel Deutschland GmbH 68635RFP36U-01 ユーザーズマニュアル
Appendix
379
10.7 DEFINITIONS
Asterisk
Asterisk is a complete Open Source PBX in software. It runs on Linux, BSD
and MacOSX and provides many features. Asterisk supports voice over IP in
many protocols, and can interoperate with almost all standards-based
telephony equipment.
and MacOSX and provides many features. Asterisk supports voice over IP in
many protocols, and can interoperate with almost all standards-based
telephony equipment.
Base station
Please see: RFP or Radio Fixed Part
DECT
Digital Enhanced Cordless Telecommunication
The standard (ETS 300 175) essentially specifies the air interface, known as
the radio interface. Voice and data can both be transmitted via this interface.
The standard (ETS 300 175) essentially specifies the air interface, known as
the radio interface. Voice and data can both be transmitted via this interface.
Its technical key characteristics for Europe are:
Frequency range: approx. 1880 – 1900 MHz (approximately 20 MHz
bandwidth)
bandwidth)
carrier frequencies (1728 kHz spacing) with 12 time slots each
Doubling the number of time slots (to 24) using the TDMA process
Net data rate per channel of 32 kbps
(for voice transmission using ADPCM)
(for voice transmission using ADPCM)
Voice coding using the ADPCM method
Its technical key characteristics for North American are:
Frequency range: approx. 1920 – 1930 MHz (approximately 10 MHz
bandwidth)
bandwidth)
5 carrier frequencies (1728 kHz spacing) with 12 time slots each)
Doubling the number of time slots (to 24) using the TDMA process
Net data rate per channel of 32 kbps
(for voice transmission using ADPCM)
(for voice transmission using ADPCM)
Voice coding using the ADPCM method
GAP
Generic Access Profile
The GAP standard (ETS 300 444) is based on the same technology as DECT,
but is limited to the most important basic features. This standard was created
in order to allow telephones of different vendors to be used on any type of
DECT system. It thus represents the smallest common denominator of all
manufacturer-specific variants of the DECT standard.
The GAP standard (ETS 300 444) is based on the same technology as DECT,
but is limited to the most important basic features. This standard was created
in order to allow telephones of different vendors to be used on any type of
DECT system. It thus represents the smallest common denominator of all
manufacturer-specific variants of the DECT standard.
An important limitation in the GAP standard is that external handover is not
possible. For this reason connection handover is used, which is supported by
GAP terminals.
possible. For this reason connection handover is used, which is supported by
GAP terminals.
The operation of GAP-capable telephones is comparable to that of analogue
terminals. For example, features can be called up via ‘*’ and ‘#’ procedures.
terminals. For example, features can be called up via ‘*’ and ‘#’ procedures.
Handover
A handover is similar to roaming, but occurs during an ongoing call. A
handover normally takes place “in the background”, without disrupting the call
(seamless handover).
handover normally takes place “in the background”, without disrupting the call
(seamless handover).