SEVENSTAX PPP-Stack
The SEVENSTAX PPP stack is used in units with serial data transfer i.e. via analogue modem, GSM, GPRS, RS232, ISDN or DECT. SEVENSTAX PPP was designed for running on units which are in use as clients on a network e.g. Web-Browsers or units which pull or send data autonomously. In short, when unit cost is of direct influence and a high level of system security is required, that is when the advantages of SEVENSTAX PPP are most evident.

Advantages
  • outstanding performance on small platforms with less RAM/ROM
  • send and receive buffers can be used for data processing by the upper protocol layers
  • fast integration and short development timeframe as only functions necessary for operation need be integrated and tested
  • the stack has minimal interface requirements and can be easily integrated into existing software


Characteristics

  • small memory footprint
  • for micro-controllers from 8...32 bit
  • integrated sub-protocols LCP, PAP and IPCP
  • authenticity check by PAP
  • "On the fly" HDLC en-/decoding
  • asynchronous performance without OS multithreading capability
  • portability - ANSI C
  • optimized for the connection to Internet Service Providers (ISPs)
  • approved in Germany, USA, Asia and South Americ


Specials

  • authentication using CHAP
  • supports ACCM (Asynchronous Control Character Map)
  • header compression
  • protocol compression
  • IP-compression (Van Jacobson Compressed TCP/IP)
  • automatic connection check


Memory & System Requirements

  • ROM: approx. 4 kbytes
  • RAM:
      - 600 Bytes receive buffer (ADJ),
      - 600 Bytes send buffer (ADJ),
      - approx. 30 Bytes variables
  • CPU: Load less than 5 % (16-bit CPU, 10 MHz, 14400 bd modem connect)
  • 32-Bit Timer/Counter (Software) with a resolution of 1 ms