System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Management Connection
Page 3-44 Proprietary Information Aastra
3.10 Management Connection
3.10.1 Overhead information
The Section Overhead SOH forms an STM-N frame together with the
payload. This frame includes all information required for frame
synchronization, service purposes, performance monitoring and other
functions. The SOH is composed of a block of 9 lines with N x 9 columns
each (N = 1, 4, 16).
The Path Overhead POH and container C4 are forming the virtual
container VC4.
The SCU module permits access to the Section Overhead Bytes (SOH) and
VC4 POH bytes (D, E, F and auxilliary byte).
The D-bytes (DCC
M
, DCC
R
) can be applied to the processor for further
processing or switched through transparently. The E- and F-bytes are the
E1, E2 and F1-byte of the Section Overhead. These can be passed through.
A through-connection of the F2- and F3-byte is not possible.
Through-connection of overhead information
The following diagram shows the through-connection options for overhead
information.
3.10.2 Management connection of the SDH expansion
The management connection of the SDH expansion is set up via the Data
Communication Channel DCC of the Section Overhead. Regarding the
DCC, it can be adjusted as to whether the DCC
M
(Multiplex Section) or
DCC
R
(Regenerator Section) shall be used.
In addition, it is possible to re-route the management information and carry
it via an STM-1 signal in a TU12 or via a 2 Mbit/s port (external/internal).
STM-1
STM-1
West
East
SCU A
STM-1
STM-1
West
East
SCU B