Avaya Communication Manager IP DECT, Руководство по установке, администрированию и обслуживанию

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Overview
8 Avaya IP DECT Installation, Administration, and Maintenance
Definitions
RTP Real Time Protocol
TFTP Trivial File Transfer Protocol
VLAN Virtual Local Area Network
DECT Digital Enhanced Cordless Telecommunication
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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.
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Its key technical characteristics are:
- Frequency range: approx. 1,880 – 1,900 GHz
(approx. 20 MHz bandwidth)
- 10 carrier frequencies (1,728 MHz 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 kbit/s (for voice
transmission using ADPCM)
- Voice coding using the ADPCM method
- Maximum transmission power of 10 mW
GAP Generic Access Profile
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GAP is the abbreviation for Generic Access Profile
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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.
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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.
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The operation of GAP-capable telephones is
comparable to that of analogue terminals. For example,
features can be called up via ‘*’ and ‘#’ procedures.
Handover 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).