Jayhawk

University of Kansas

Telecommunications & Information Sciences Laboratory

Electrical Engineering & Computer Science


Elements of Network Receive Path

Functionality

  • receives data from SONET/ATM WAN
  • SONET frame descrambled, overhead stripped
  • cell stream in SONET payload delineated and descrambled
  • cell payloads descrambled
  • cells buffered for rate adaptation
  • flow control credits updated
  • cells buffered and addresses mapped on CommonPCB
  • SONET Descrambler and BIP Verification Chip

  • byte to word conversion
  • Section, Line BIP-8 computations and comparisons
  • SONET descrambling
  • OC-12c and 4xOC-3c: XC3195-3 @ 20 MHz, 4456 equivalent gates
  • Descrambler

    SONET Path Overhead Termination Chip

  • tracks and extracts Path Overhead from SONET frame
  • provides Path Overhead location to other chips
  • coordinates storage to SRAM for LCP retrieval
  • computes and verifies Path BIP-8
  • OC-12c and 4xOC-3c: XC3195-3 @ 20 MHz, 4448 equivalent gates
  • Path Terminator - OC-12c

    ATM Cell Delineator Chips

  • ATM cell delineation (cell stream synchronization)
  • HEC computation and deletion
  • cell payload descrambling
  • idle cell deletion
  • SONET overhead deletion
  • 4xOC-3c: two XC3195-3 @ 20 MHz, 6300 equivalent gates each
  • OC-12c: two XC3195-3 @ 20 MHz, 4800 equivalent gates each
  • Delineator Chips

    Author

    Joseph B. Evans, <evans@ittc.ku.edu>