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Since its groundbreaking marriage of MPEG Layer-3 and ISDN technology in 1993, Telos Zephyr has become perhaps the most successful digital broadcast product ever. Today Zephyr is the standard for high-quality audio transmission at broadcast facilities worldwide. Zephyr Xstream introduces MPEG4 AAC-LD coding, the newest compression algorithm from MP3 inventor Fraunhofer Labs, for Layer-3 audio quality with transmission times reduced up to 80 percent. True two-way high-fidelity remotes over ISDN are finally a reality! Zephyr Xport utilizes a unique custom DSP-based modem architecture that allows use of an ordinary analog (POTS) telephone line for transmission of high-quality mono audio to an ISDN-connected Zephyr Xstream. Xport delivers incredible audio quality by using the highest fidelity low-bitrate coding method on Earth: Coding Technologies revolutionary aacPlus, the combination of MPEG AAC (Advanced Audio Coding) and SBR (Spectral Band Replication). This method improves the efficiency of the codec by 30% over plain AAC (which itself is 30% more efficient than MPEG Layer 3) to deliver stunning reproduction of voice and music.