System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
SDH Mapping/Concatenation
Page 4-12 Proprietary Information Aastra
4.6 SDH Mapping/Concatenation
• Ethernet data, consisting of consecutive frames of any valid size, can
be mapped into either VC-12 or VC-3 of the STM-1 signal with the
following conditions:
— Mapping Ethernet data to nx VC-12 (n=1 to 63) for all Ethernet
ports of the module. Maximal 63 VC-12 (STM-1 capacity) are
supported.
— Mapping Ethernet data to m x VC-3 (m=1 to 3) for all Ethernet ports
of the module. Maximal 3 VC-3 (STM-1 capacity) are supported.
— The combined use of V-C3 and VC-12 is possible within the limits
specified above.
Example:
1 x VC-3 and 42 x VC-12
2 x VC-3 and 21 x VC-12
3 x VC-3, no VC-12
63 VC-12, no VC-3
• The EoSCU module provides four Ethernet interfaces for operating
with high transmission rates up to 100 Mbit/s.
• With GFP, an ’Encapsulation’ mechanism is provided for Ethernet
MAC frames in compliance with IEEE 802.3 and their transmission via
an SDH carrier. This procedure is defined in ITU-T Recommendation
G.7041/Y.1303.
• Resizing of VC-12 and VC-3 groups is supported using the LCAS
(ITU-T G.7042). The size of the group can be changed without
discontinuity the Ethernet service.
• The maximum differential delay supported on VC-X links is 32 ms.
4.7 Clock Supply
Please refer to Section 3.6, Clock Supply .
4.8 Performance Management
Performance management is divided up into two categories. Ethernet
performance counts are handled using the generic performance data
collection and reporting of data at 15-min. and 24-hr intervals. In addition, a
shapshot of the current Ethernet performance data can be requested.