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INTRODUCTION This Directory attempts to list all public radio stations, producers or facilities that have Switched Digital Audio equipment that utilize ISDN (or sometimes the older "Switched 56") to send or receive high quality audio. This directory was established to assist public radio producers and technicians in locating sites with which they can do high quality interviews, program transfers or to locate remote production sites. Some other related sites are:
DIRECTORY FORMAT All public radio stations and other related production facilities utilizing "ISDN" are sorted by COUNTRY, then by STATE or PROVINCE.USA users: When calling locations outside of the USA or Canada, use the international prefix "011"). Numbers assigned to Switched Digital Audio equipment are in the form NNN.NNN.NNNN to differentiate them from the site contact numbers in the same column which are in the format NNN-NNN-NNNN.The directory lists all known codec compression systems available at each site. They are usually:
BRIEF HISTORY OF THIS DIRECTORY This directory was first introduced in 1993 by Allen Rieland, who was Director of Engineering at Wisconsin Public Radio from 1985 - 2005 and is now the Director of New Media. After the installation of WPR's first "Switched 56" terminal, he found that there was no directory of other "Switched Digital" sites available, so he created one with the help of engineers from National Public Radio, Monitor Radio, the CBC and other users of this relatively new technology. In its original form, it consisted of ALL known "Switched Digital" sites, however the number of commercial users expanded so rapidly that the focus of the list was narrowed to only Public Radio facilities. In 2007, with the demise of ISDN in many locations, this criteria was again loosened to all users, however the site was for the "Benefit of Public Radio Stations and Producers".For the first few years, the ISDN Audio Directory for Public Radio was sent to Public Radio Stations via the NPR DACS system every 6 months or so. As the use of the "World Wide Web" increased, a web site became an obvious way to keep a single, updated, on-line directory available for everyone in the Public Radio community. In September 1996, in an effort to simplify the web-based directory, the 50 separate state and province files were combined into one web page, still retaining the quick-index feature. The directory is also now easily printable - albeit many pages long! Of course it can also be printed in smaller pieces by using selective printing or cut and paste methods. At that time, the web address for the directory was also changed to the wpr.org domain and simplified to simply http://wpr.org/isdn CODEC COMPATIBILITY There is very little hard information regarding compatability between codecs, however Telos Systems confirmed several years ago that their Zephyr had varying levels of compatibility with other manufacturer's products. Generally, G.722 was compatible across all manufacturer's equipment. With some adjustments, Layer 2 and Layer 3 codecs were compatible between Telos Zephyr, Musicam/CCS and Comrex. If you have other information, please email it to me so I can share it with everyone using this directory. UPDATING THIS DIRECTORY & USER FEEDBACK You can send in a new entry or update an old one using our On-line Directory Update Form. If you have suggestions, more complex directory updates, browsing problems, or comments, please email them to Allen Rieland at Rieland@wpr.org, call at 608-263-5544 or write to: Allen Rieland, Wisconsin Public Radio, 821 University Avenue, Madison, WI. USA 53706.
The ISDN Audio Directory for Public Radio is located at http://www.wpr.org/isdn |