System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Branching function
Page 2-68 Proprietary Information Aastra
2.6.4 Branching function
In contrast to the conference configurations possible so far, a higher
security can now be achieved by switching a conference in an arbitrarily
meshed topology. Relevant in this case is the topology set up using 64 kbit/s
channels switched between the ports of the corresponding conference
nodes.
To "rip up" meshes, a tree with an unambiguous root is set up automatically.
In case of a fault or failure, this tree adapts itself automatically to the
changed topology. The algorithm used for this purpose is identical with that
required for the service channel necessary for communication between the
management system and XMP1 nodes. This also applies to the behavior in
case of interruptions.
The following diagram shows an example of a conference.
The branching function of the XMP1 system permits automatic and
fault-tolerant routing in meshed networks. The subscriber signal is
transmitted in a 64 kbit/s channel between the different subscribers
participating in the conference. This function is supported both for analog
and digital conferences.
The analog branching function is supported by the KZU FEK (8) module.
This module offers four analog conference channels for the branching
function. For this purpose, the "CNF analog conference" module must be
provided in the operating software.
The digital branching function is supported by the "DSK modular" module
equipped with all V- and G-interfaces. Up to 8 subscribers can be configured
here. Another important application option for the digital branching function
is the protection of the 64 kbit/s SOA management channel when using
QD2 and QD2/GN Central Units.
XMP1
# 1
XMP1
# 4
XMP1
# 2
XMP1
# 3
XMP1
# 5
Head Station
(Master)
Subs.
Modem
Slave
Subs.
Modem
Slave
Subs.
Modem
Slave
Subs.
Modem
Slave
Subs.
Modem
64 kbit/s
64 kbit/s64 kbit/s
64 kbit/s