System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Design of the SDH Expansion
Aastra Proprietary Information Page 3-3
3.2 Design of the SDH Expansion
The SDH expansion is implemented in the XMP1 system by means of the
following modules:
• SCU (SDH Core Unit)
• CU-E (Central Unit Expansion)
The SDH expansion of the XMP1 system is implemented on the SCU
module. This module occupies two card slots in the XMP1 subrack. The
CU-E sub-module is used as control module. It is mounted on the Central
Unit (62.7040.xxx.xx) of the node.
SCU (SDH Core Unit)
The SCU (SDH Core Unit) module is composed of the SCU-B and SCU-E
boards.
Each one of these boards can be equipped with an SDH Interface Unit
SIFU. These are providing the STM-1/4 interfaces. SFP modules (Small
Form Facture Pluggable Modules) are used for optical STM-1/4 interfaces
and the electrical STM-1 interface. These SFP modules carry out the
opto-electrical conversion of the interface signals. The optical fibers are
connected via LC plug connectors. With the electrical STM-1 interface, the
connection is set up using coaxial (straight) 1.0/2.3 plug connectors.
SIFU
SFP
SDH Core Unit SCU