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).
Desk phones, mainly it is a wire telephone placed on the table. There
are very many variations of such telephones differentiating with the quality of
sound and connection as well as with the pack of functions and price.
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