New York - Along with known file-sharing traffic throttler Comcast (NASD: CMCSA), fellow broadband provider Cox Communications is also interfering with the usage of BitTorrent and similar peer-to-peer applications by its subscribers, the Associated Press reported, citing research conducted by German's Max Planck Institute for Software Systems. The study monitored over 8,000 Internet users worldwide, and found conclusive evidence of blocked file-sharing connections only by Comcast, Cox and Singapore's StarHub.