As part of the long-term alliance to jointly develop and market ATM offerings the Public Communication Networks Group of Siemens AG and Newbridge Networks Inc have extended the MainStreetXpress family of products with the MainStreetXpress 36130 ATM Services Access Multiplexer. The new customer end multiplexer provides for aggregate ATM speeds from 1.5 to 8Mbps that can be delivered over one to four T1/E1 interface cards using inverse multiplexing over ATM. Yet to be standardized, inverse multiplexing over ATM looks likely to become the norm for combining the bandwidth of a number of lower cost T1/E1 lines into a single higher speed ATM service. The MainStreetXpress 36130 ATM Services Access Multiplexer system provides for ATM to deliver services such as analog voice grade services, ISDN backhaul, digital data service, X.50, n(x)56/64 Kbps, fractional and full T1/E1 private line services, X.25 packet services and frame relay services, says Newbridge. The MainStreetXpress 36130 ATM Services Access Multiplexer has an optional ATM expander card can be installed to provide the AAL5 convergence layer for frame relay, X.25 and synchronous High Level Data Link Control, HDLC, traffic. No pricing available. Newbridge has also added an ATM Services Card for connecting T1/E1 lines to ATM through its 3600 MainStreet Bandwidth Manager. The card supports a single ATM aggregate which is comprised of up to four inverse multiplexed T1/E1 links.