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).
A device or a program, which is makes the transformation of data or
signal. Codecs can both code flow/signal (often for transfer, storage or
encoding) and decoding – for review or changes in the size, more suitable also
for these operations. Codecs are often used during the digital processing of
video and sound.