Page 223 - Optical Switching And Networking Handbook

09_200023_CH08/Batesx 1/17/01 8:20 AM Page 208

208 Chapter 8

configurations. However, they require additional and costly trans-
mission equipment when used in meshed networks.
In just under two years, DWDM has become an industry standard
that will find acceptance in any carrier environment. Therefore,
DWDM
Allows new services to come online more quickly.

Contains costs so that customers can afford new services.
Overcomes technological barriers associated with more
traditional solutions.
Newer applications emerge using the hybrid combinations of pas-
sive optical networks (PONs) in a community alongside of the coax-
ial systems serving broadband communications in the business and
residential market. The use of different wavelengths in this market
makes the combinations that much more attractive and economical.
This combined networking strategy with DWDM in the metropolitan
area is shown in Figure 8-18.

Figure 8-18
Combining services
in the metropolitan
area (Alcatel)
HFC

PON

Enterprise Area
Networks
Residential Area Network

Source: Alcatel