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).
On April 10, 2012 the company Yealink, a leading manufacturer of IP-phones and VoIP communication systems, has announced the official start of sales of the new IP videophone Yealink VP530.
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