System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
SDH Functions
Aastra Proprietary Information Page 3-5
3.3 SDH Functions
The SDH functions provided by the SDH expansion of the XMP1 system are
made available by the SCP (SDH Core Processor). This SCP offers the line
and cross-connect functions of an SDH multiplexer.
The following functions are provided by the SCP:
• 2 x SDH line interfaces (West/East), configurable for STM-1 or STM-4
• Overhead processing (SOH, HOVC, LOVC)
• Overhead interface to the OH bus (SOH, HOVC)
• 32 x STM-1 ports for non-blocking VC switching (VC-4, VC-3, VC-2,
VC-12)
• SETG (Synchronous Equipment Timing Generator)
3.4 Interfaces
In the XMP1 system, the SDH expansion provides the following interfaces:
STM-1/4 interface
(West)
External E1 interfaces
4 x 2 Mbit/s
External E1 interfaces
6 x 2 Mbit/s
Internal E1 interfaces
8 x 2 Mbit/s to PDH section via system bus
IB interface
to CU-E
STM-1/4 interface
(East)
Timing interface
T3, T4
SCU (SDH Core Unit)
SCP
Front panel to 2nd SCU
P12LPU
Central Unit
CU-E
IB interface
to SCU
LAN
IB cable
PSPE
Figure 3.2: Interfaces of the SDH expansion