While the definition
of this term has broadened over the past five years, the original MSPP usage referred to
a SONET ADM that added packet technology (Ethernet, most importantly), as well as
more advanced SONET capabilities such as full SONET switching. Figure 11.6 illustrates
an MSPP with Ethernet capabilities. The Cerent 454 (now the Cisco ONS 15454) and
Fujitsu??™s FLASHWAVE 4300 represent two of the earliest MSPP systems.
The marriage of EoS and the ADM is a natural one. SONET ADMs are the fundamental
building blocks for service providers??™ optical access networks. Most Ethernet
services operate at high bandwidths that require optical access. The MSPP enables a
single device to handle optical access for all services.
Moreover, the GFP/VCAT/LCAS mapping features technical properties that lower
the costs of MSPP deployment. Not only do GFP/VCAT/LCAS provide a standard, efficient,
and robust way to map Ethernet into SONET, they do so in a way that interoperates
with legacy SONET equipment that is not EoS-enabled, such as traditional
Figure 11.6 Multi-service provisioning platform (MSPP) with Ethernet
SONET
ADM
OC-N
fiber ring
OC-N
I/F
OC-N
I/F
OC-N
I/F
??¦
DS3
I/F
DS3
I/F
??¦
DS1
I/F
DS1
I/F
??¦
STS
switch
OC-N
I/F
VT
switch
(optional)
SONET
ADM
Ethernet
I/F
Ethernet
I/F
??¦
Ethernet
switch
(optional)
MSPP
MSPP
Multi-service provisioning
platform (MSPP)
EoS
308 Chapter 11
ADMs (see Figure 11.
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