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).
Analog Adapter – this is a device used for connecting one or several standard analogue telephones to digital telephone communication systems (for example, VoIP) or non-standard telephone systems.