User`s manual

Chapter 1 Overview
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 LAPS (Link Access Protocol – SDH) encapsulation in accordance with ITU-T
Rec. X.86
 GFP (Generic Framing Procedure) encapsulation in accordance with ITU-T
Rec. G.7041, using the framed mode. mapped into G.707 VC payload.
The user can select the preferred encapsulation mode, separately, for each
virtually concatenated group. The encapsulation parameters can also be
configured, for best performance in specific applications.
The encapsulated frames of each group are applied to the corresponding group
mapper.
1.6.4.2 Group Mapper Functions
The group mappers plot the LAN traffic for transmission over the SDH network.
The mappers also create the virtually concatenated groups that enable the user to
control the utilization of the bandwidth available on the link to the SDH network.
The mapper serving the Ethernet switch can manage up to four groups (these are
always groups 1 to 4).
Link bandwidth utilization is configured within two steps:
 Define the bandwidth allocated to each group: selecting the type and the
number of VCs allocated to each group makes this. The bandwidth is
allocated using virtual concatenation.
Following are several examples of bandwidth allocation enabled by virtual
concatenation:
Note:
For compatibility with equipment from other vendors, the
user can configure the group mappers to simulate the use
of virtual concatenation even when the group includes a
single virtual container.