Irvine, Calif.Teridian Semiconductor Corp. has developed a pair of networking devicesthe 73M1866 and 73M1966that employ MicroDAA technology or data access arrangement (DAA) functions designed for Foreign-Exchange-Office (FXO) of Voice-over-IP (VoIP) systems.
The 73M1866 and 73M1966 are well-suited for “PSTN lifeline” support for VoIP equipment, small and medium enterprise integrated service routers, converged media gateways, analog telephone adapters, VoIP ” PBX, and residential/CPE gateways. The “PSTN lifeline” function provides telephony service for business continuity and access to Emergency 911 in the event of a VoIP equipment failure. The 73M1866 provides the majority of the circuitry to connect PCM- formatted voice channels to a PSTN via a two-wire, twisted-pair interface. This single 8mm x 8mm QFN package provides best-in-class return loss, EMI and Common Mode noise performance, resulting in superior voice quality, according to the company.
The ability to support host-side power makes the 73M1866 independent of PSTN loop variations, generating robust performance in any deployment environment. The product uses an inexpensive common pulse transformer that forms a digital isolation barrier, transferring both power and data to the PSTN line side components.
This technology is also available for extended isolation requirements as a chipset, the 73M1966. The result is reliable performance in the presence of EMI and line voltage variations.
Teridian Semiconductor Corp., 1-714-508-8800, www.teridian.com