Our Product Division builds uninterruptible DC premises powering systems for ISDN, VoIP telephony, LAN terminals. Channel Banks, CSU's as well as Network Termination Units (NT1's). SEI's ISDN offerings are focused on providing for the CPE powering of digital Centrex telephone service, which employs ISDN as a backbone protocol. SEI is the world leader in supplying these ISDN powering solutions. Find out more about SEI's diverse line of ISDN power products...

Our Voice-Over-IP (VoIP) products provide power for the convergence of voice and data traffic on the enterprise packet-based data network. IP telephones are directly connected to the enterprise's Ethernet and require a centralized power source to be delivered via the Ethernet. SEI, a participant in the IEEE task force that formulated the 802.3af standard for Power over Ethernet, is actively engaged in engineering vendor-independent power and battery backup solutions for this technology. Find out more about SEI's Ethernet power solutions for VoIP telephony... 

Our DC UPS products provide battery-backed 48 Vdc (nominal) power with output current ranging from 4.5 to 13.5 Amps. These units feature customer-selected output distribution modules to facilitate use with a wide variety of applications. A wide range of battery pack options provide backup time from 20 minutes to 8 hours. Find out more about SEI's DC UPS's....

The mission of the Power Services division is to install, service and maintain AC and DC critical power systems. SEI is focused on providing the power infrastructure for the telecommunications industry. Our customer base is primarily long distance, local exchange, and transmission, cable and interconnect carriers, as well as enterprise users. Find out more about SEI's Power Services Team...

SEI Direct supplies a wide range of non-SEI telephony/computer equipment and services to Federal and state agencies through its GSA procurement schedules.Find out more about SEI Direct.