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ID = 56; $post->blog_id = 1; $post->guid = "analog_digital_and_optical_tra"; $post->comment_status = "open"; function get_option($option) { $settings = array( "disqus_forum_url" => "enfoto", "disqus_api_key" => "ycbgTTDFptwqNvNKMygOnMx7brM3Darx5GO9iKxluXuEzzcLmrZKVrH36T4bYcKl", "disqus_sort" => "", "disqus_partner_key" => "", "disqus_disable_sync" => "0" ); return $settings[$option]; } function get_permalink() { return "http://www.enfusion-group.org/~adrian/2002/04/analog_digital_and_optical_tra.html"; } function get_the_title() { return "Analog, Digital, and Optical Transmissions."; } function get_the_excerpt() { return "

After a trip to IStop.com's POP and co-location facilities in Ottawa last week, I realized how little I actually knew and understood about xDSL, digital signalling and optical networks. Actually, I also realized that I'd never really taken the time to understand or figure out how regular analog modems worked.\r\n

howstuffworks.com is a great resource for learning the basics about various things. I checked out their How DSL Works and How VDSL Works articles which then led me to CAP/DMT, QAM and optical networks. Actually, figuring out what QAM was all about also got me reading about FM, AM, and more traditional analog modulation techniques.\r\n

Cisco has some great documentation about optical networking gear and technologies, such as DWDM, as does this page.\r\n

Since most of these concepts are used ubiqitously throughout the telecommunications industry, I've found it interesting to find out more about them, and see how they're applied in slightly modified ways across various technologies, old and new.\r\n

I've added a few links to PDF's I've come across on my docs page."; } function get_the_offset() { return -5; } function start_mt() { include('/var/www/cgi-bin/mt/php/mt.php'); $mt = new MT(1, '/var/www/cgi-bin/mt/mt-config.cgi'); return $mt; } function trackback_url() { return "http://www.enfusion-group.org/cgi-bin/mt/mt-tb.cgi/56"; } include('/var/www/cgi-bin/mt/plugins/disqus/php/disqus.php'); include(dsq_comments_template(1)); ?>