PXS Software - LayGO® Server

The PXS flash memory contains a LayGO® server application statically linked to eCos, a multithreaded RTOS (Real Time Operating System). eCos includes a complete TCP/IP stack and support for HTTP, DHCP, FTP, DNS, SMTP, SNMP, and NTP.

The figure to the right shows all the components of a typical LayGO® application (the AFT/X25 server). Hold the mouse over the balloons to see the explanations.

At the physical layer, the primary use of the PXS is to switch synchronous and Ethernet data. In addition, switching can be synchronous <–> synchronous, synchronous <–> asynchronous, and Ethernet <–> asynchronous.

At the Ethernet level, the primary higher protocol will be TCP/IP, although it is possible to use the Ethernet Packet Mode alone. The synchronous ports can be either bit-synchronous (transparent or raw mode HDLC/SDLC), or byte synchronous (monosynchronous or bisynchronous).

In bit-synchronous HDLC/SDLC mode, switching can be done on any protocols supported by LayGO®: X.21 (X.21bis), HDLC/LAPB, HDLC/LAPD, Frame Relay (FR), NRM, X.25/LAPB, X.25/LAPD, and X.25/LAPB/FR (Annex G).

The LayGO® protocol software and applications can run either on the PXS, on the host, or on a combination of the two. We have implemented an RPC-like interface between PXS and host allowing customers to run existing LayGO® applications unmodified.

The "Solutions" section shows several PXS applications.