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132 Chapter 6

manufacturing locations, insurance companies, and corporate head-
quarters fall into the basic category of organizations requiring this
type of bandwidth.
One major supplier of enterprise WDM systems has several
installations requiring more than 100 connections between two sites,
making WDM essential to preserving fiber resources. Many major
corporate users are asking for high-capacity private lines at OC-12
(622 Mbps) and OC-48 (2.5 Gbps) rates. To satisfy this need, WDM
and DWDM are the preferred choices to deliver the speeds needed.
The connections discussed are included in Figure 6-3 across the met-
ropolitan area and Figure 6-4 for remote SAN access.
ONI has developed an optical switch for the metropolitan area
to link the access to the metropolitan network, as shown in Figure
6-4. This high-end service offers the ability to interconnect from
the customer door to the middle of the incumbent local exchange
carrier (ILEC), for example the TELCO, networks or the data local
exchange carrier (DLEC) networks.

Figure 6-3 Corporate Headquarters Disaster Recovery
Applications IBM Site
requiring Mainframe Escon
WDM/DWDM CO
access in a Mid-Range
metropolitan area Server FDDI Switch WDM/DWDM
Ring in
(ONI Systems) CO MAN Remote Site Across Town
10 Gbps
CO
Office
100 Mbps FDDI
FDDI FDDI
Router
Gigabit
Ethernet
SAN