System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Traffic architecture
Aastra Proprietary Information Page 4-11
Connections between the SDH section and PDH kernel
The Ethernet expansion provides four Ethernet interfaces, the STM-1/4
interfaces and a total of 6 x 2 Mbit/s interfaces for connecting external 2
Mbit/s signals.
In the PDH kernel direction, eight 2 Mbit/s interfaces are available for
switching purposes.
The 64kbit/s switching matrix is used to apply the data of the PDH kernel to
the internal 2 Mbit/s interfaces (E12 internal) of the SDH expansion. Then
the corresponding VC-12 is switched via the TU12 switching matrix in the
STM-1 or 2 Mbit/s direction (external).
Depending on the configuration, the Ethernet data are mapped either into
VC-12 or VC-3 virtual containers. Up to 3 x VC-3 or 63 x VC-12 are
provided for transmission of the Ethernet data available at the four Ethernet
interfaces.
The following drawing shows the switching matrices used and the resulting
switching options available between the SDH expansion and PDH kernel of
the XMP1 system.
PDH
64 kbit/s
2 Mbit/s
Ext. 2 Mbit/s
(6 x 2 Mbit/s)
4 x Ethernet
STM-1/4(West)
SDH
TU12
64kbit
(4 x 2 Mbit/s)
(4 x 2 Mbit/s)
SD bus
E12 internal
E12 internal
AU4
TU3
HOA
STM-1/4 (East)
Ethernet
Mapper