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).
If you will connect two high functional ChatAttach160 speakerphones, you will get a convenient loudspeaker communications system for Skype perfectly suitable for large offices. Speakerphone is connected to a personal desktop computer or a notebook through universal USB port.
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