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 SFE2000P is one of the best switch models, designed for use with modern VoIP-equipment. The switch is characterized by elevated levels of reliability.