ATM Physical layer

ATM cells. For screening of cells matching the receive header and mask criteria.

  • Header. Values in binary form (0, 1 and x for mask use).
  • Screening:
    • Accepted. Cells with matching header will be accepted.
    • Discarded. Cells with matching header will not be accepted.

Idle cells. For screening of cells matching the receive idle header and mask criteria.

  • Idle header. Values in binary form (0, 1 and x for mask use).
  • Screening:
    • Accepted. Cells as idle ones will be accepted.
    • Discarded. Cells as idle ones will not be accepted.

Basic options. Framing options relative to the transmit and receive parts of the physical interface.

  • Cell delineation via HEC alignment
    • Yes. 53 octet cells are expected.
      For use in modes where cells are directly mapped into the physical layer: DS1, E1, DS3.
    • No.
  • HEC covers octets 2-4 (SMDS)
    • Yes. The HEC (Header Error Control) is calculated over header octets 2-4 for SMDS/802.6 cells.
    • No. The HEC is calculated over header octets 1-4 for ATM cells.
  • HEC XORed with polynomial x6+x4+x2+1
    • Yes. Enables the x6+x4+x2+1 polynomial to be XORed with the calculated HEC prior the transmission and prior to error detection/correction.
    • No.
  • NRZ data encoding
    • Yes. Use NRZ encoding.
    • No. Use B3ZS/HDB3 encoding.

Simulation options. Framing options only relative to the transmit part of the physical interface

  • Transmit clock sourced from receive clock
    • Yes. Transmit clock sourced from receive clock.
    • No. Internal transmit clock.
  • Use internal 8khz PLCP reference
    • Yes. Transmit PLCP is synchronised by an internal 8KHz ref.
    • No. Transmit PLCP is synchronised with the received PLCP.
  • Force cycle stuffing
    • Yes. Force the default stuffing operations in DS3 and G751 E3 PLCP modes.
    • No. Stuffing is performed to synchronise transmit PLCP with 8 KHz frame reference (internal or received PLCP).

 


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updated:  27-Feb-04