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).
Cisco 6901 IP phone model is used for creating inexpensive communication networks in places like elevators, hotel or restaurant corridors etc (UC Phone 6901, Standard handset).
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