I plan to prepare for 642-321 certification (optical SDH). Knowing that I'm beginner in optical network (I got some basics) but I've a good network background (CCNA), do you that's reasonable to prepare by myself ?If yes, which book do you recommand ? Is it a mandatory to do labs with ONS routers ?
For anyone with access to Cisco Learning Connection (any CCNA or above I believe), you can access a number of online courses for free following the links off of the Optical Specialist page. This will provide you some good insight into the basics of SONET/SDH and fiber optic communication.
Honestly, I would not recommend self-study as a sole preparation method. I worked on a 15454 SONET network for 3 years before attending a training bootcamp at Global Knowledge. SONET is not like regular networking at all so your CCNA experience will really only help as far as connecting the ONS to an IP network for management.
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