Page 144 - Optical Switching And Networking Handbook

07_200023_CH06/Batesx 1/17/01 10:05 AM Page 129

Optical Switching Systems and Technologies 129

Metropolitan Migration

WAN changes and installations of the past offer logical steps to fol-
low in the metropolitan area market. Very few wave-division multi-
plexers (WDMs) and DWDMs are installed in the metropolitan
networks. Even at the SONET OC-192 rate, only limited installa-
tions have taken place. Therefore, it is difficult to imagine wide-
spread requirements for optical switches. Nevertheless, the switches
are coming. When the local providers begin offering customers
(enterprise managers) newer gigabit and 10 Gigabit Ethernet trans-
mission speeds across town or as an access method to the Internet
through the ASP, then the higher-speed optical switches will become
absolute requirements. Figure 6-2 shows a typical network that may
be used to offer this type of service for DWDM end to end.As the car-
riers and ASPs begin their deployment, this model is one that may
offer the advantages expected to meet the overall demand for the
future. In this networking strategy, many suppliers are offering the
equipment and managed services.

Figure 6-2 CO
Home
Metropolitan area
EPC Home
end-to-end DWDM CO
CO
networks (Sorrento CO DSLAM
Networks)
CO
Office Park
POP
DWDM DWDM
Metro Metro
Ring Ring
EPC

Customer NMS Legend
Bandwidth
Manager EPC
GigaMux
TeraMatrix
Central Office