System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Expanded Digital Conference
Aastra Proprietary Information Page 2-45
2.6.2 Expanded Digital Conference
Using the "Expanded Digital Conference", several subscribers of an XMP1
network can be interconnected to form a conference. The subscriber
signals are transmitted in a 64 kbit/s channel via the 2 Mbit/s links of the
XMP1 network.
The interfaces/converters of a module involved in an EDC are all equal in
priority. The transmit data of each subscriber connected to an
interface/converter are forwarded to all other subscribers participating in the
EDC. Communication is symmetrical and the behaviour corresponds to that
of a subscriber connected to a two-wire bus. For this reason, only
half-duplex operation is possible.
In an "Expanded Digital Conference", a terminating unit connected to an
interface can act as Master. All other terminating units of this EDC are then
used as Slaves. However, this definition is not implemented in the XMP1
system. The Operator himself must define as to which terminating unit shall
act as Master or Slave.
The signals supplied by the terminating units are passed through the XMP1
system transparently. The information determined for the individual
terminating units must be defined by the latter at protocol level.
In the XMP1 system, the "Expanded Digital Conference" is supported by the
following modules (with DIX-ASIC):
• DSK modular MDG
• DSK modular MDV
• DIX QD2ZT add-on
2.6.2.1 8-subscriber/2 x 4-subscriber conference
To ensure a flexible application of the EDC in the network, two different
conferences, i.e. the 8-subscriber and 2 x 4-subscriber conference, can be
configured.
The configuration necessary for this purpose is performed via the central
card slot data of the module.