Avaya Communication Manager IP DECT, Installation, Administration And Maintenance Manual

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Introduction
12 Avaya IP DECT Installation, Administration, and Maintenance
About the IP DECT base stations
All IP DECT base stations have the same hardware and software capabilities.
One of the IP DECT base stations within an IP DECT installation may be chosen to operate not
in the IP DECT base station only mode but in the Avaya DECT Mobility Manager (ADMM)
mode. During installation, you will set one of the IP DECT base stations to ADMM mode, or you
will use a dedicated LINUX server running as an ADMM. The others are in the IP DECT base
station only mode.
IP DECT base station only mode:
Within that mode, the IP DECT base station converts IP protocol to DECT protocol and then
transmits the traffic to and from the Handsets over a DECT timeslot. On air the IP DECT base
station has 12 time slots, eight can have associated DSP resources for media streams, the
remaining four time slots are used for example for control signalling between IP DECT base
stations and the Handsets or for bearer handover.
Groups of IP DECT base stations have to be built which are named Cluster. Within a Cluster IP
DECT base stations are synchronised to enable a seamless hand over when a user crosses
from one IP DECT base station’s zone of coverage to another. For synchronisation it is not
necessary for an IP DECT base station to communicate directly with all other IP DECT base
stations in the system. Each IP DECT base station only needs to be able to communicate with
the next IP DECT base station in the chain. But it is preferable for an IP DECT base station to
see more than one IP DECT base station to guarantee synchronisation in the event that one of
the IP DECT base stations fails.
The four control signalling channels are also used to carry bearer signals that signal the
Handset to start the hand over process. If the radio signal of another IP DECT base station is
stronger than that of the current IP DECT base station, then the Handset starts the hand over
process to the IP DECT base station that has the stronger signal as the user moves around the
site.
Avaya IP DECT Mobility Manager (ADMM) mode:
In this mode, an IP DECT base station functions as a regular IP DECT base station. Additionally
it is responsible for H.323 signalling between the IP DECT system and the telephony or media
server. Further on it takes management part of the IP-DECT solution. You designate an IP
DECT base station as the ADMM by assigning an IP address to the IP DECT base station in the
DHCP scope (see
Mandatory options on page 29) or by setting the data via OM Configurator
(see Static local configuration of the IP DECT base station on page 33). After an IP DECT base
station is designated as the ADMM, it starts the extra services on board (for example, the Web
Service that supports the management interface).