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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 a matching header will be accepted.
- Discarded: Cells with a 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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