E1/T1
A European format for digital transmission. E1 supports signals at 2 Mbps (32 channels at 64Kbps, with 2 channels reserved for signaling and controlling), versus the T1, which carries signals at 1.544 Mbps (24 channels at 64Kbps).
Polycom HDX4500 is a universal personal telepresence system that allows you use the latest UltimateHD technology in your existing environment of unified communications. The HDX 4500 system is made in a new form-factor, equipped with 24-inch display, 1080p camera and powerful speakers; it easy transforms any desktop computer into a multimedia communications center.
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