Figure 11.5 illustrates VCAT and LCAS.
Ethernet
Interface Rate
Required EoS
Bandwidth (500-
byte frames)
Minimum
SONET Rate
Bandwidth
Effi ciency
Minimum SONET
Rate with VCAT
Bandwidth
Effi ciency
with VCAT
10Mbps 9.85Mbps STS-1 19.9% VT1.5-7v 87.9%
100Mbps 98.5Mbps STS-3c 65.7% STS-1-2v 99.4%
1Gbps 985Mbps STS-48c 41.1% STS-1-21v 94.6%
TABLE 11.2 EoS Bandwidth Effi ciency with VCAT
Figure 11.5 VCAT and LCAS
VCAT
LCAS
VCAT
LCAS
GFP GFP
Ethernet Ethernet
EoS network
Element
LCAS controls the addition/deletion
of STS paths to the VCG due to
provisioning or failure/restoration
VCAT bytewise interleaves
GFP frames over the STS
SPE in the VCG
Each SPE in the VCG is carried
within a unique STS path, which may
be switched and protected
independently by the SONET
network. The SONET network does
not need to know the STS paths are
part of a VCG.
SONET network
EoS network
element
SONET/MSPP 307
The Multi-Service Provisioning Platform (MSPP)
As EoS technology matures, it is finding its way into more service provider network equipment.
Specifically, the integration of EoS into the SONET ADM has given birth to a new
product category??”the multi-service provisioning platform (MSPP).
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