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 November 20, 2008

NPR Distribution, Managers of the Public Radio Satellite System

Digital Sound Files and the ContentDepot


3. Delivering Audio Files (Page 1 of 3)



Internet issues relating to file delivery: How efficiently your sound files are delivered to the NOC depends greatly on the equipment and bandwidth available at your facility. Are you sending files over a T-1 line (1.544 Mbps)? Via ISDN (128 Kbps)? If you're using DSL, the bit rate can vary, and most ADSL and cable modem systems definitely provide limited upload speed. If you're using a dial-up modem, remember that programs in the PRSS broadcast-quality format upload at 120 Mb/hour for stereo files. At this rate, a single program could tie up your line for hours—or time out your connection! Upgrading your connection will improve your transmission capability.

If you're uncertain about how much bandwidth you have available, use our bandwith test to learn more about your local resources.

If you have a slow connection and you are unable to upgrade, consider sending your files at off-peak times of day, when traffic is lighter. This can be particularly helpful if you are using shared services, such as cable modems, which upload files much more slowly during periods of heavy use.


firewall issues

If your organization uses a firewall to provide network security, additional issues may arise with respect to file transfers. Check with your network administrator to get additional inforamtion.
connection speeds

Line Type:

Maximum
Speed (Mbps):

T-1

1.544

ISDN

0.128

cable modem

varies

DSL

varies

56K modem

0.056

 

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