
Total Access 544R System Manual Section 4 SHDSL RCU ATM User Interface Guide
61200704L2-1B © 2003 ADTRAN, Inc. 57
L2 PROTOCOL (SHDSL) > PROTOCOL> ATM
Asynchronous Transfer Mode allocates bandwidth on demand, automatically adjusting the network
capacity to meet the system needs. Fixed-length cells (53 octet) require lower processing overhead and
allow higher transmission speeds than traditional packet switching methods. ATM uses five octet headers
in each fifty-three octet cell to match cells with specific virtual channels to which they belong.
L2 PROTOCOL (SHDSL - ATM) > CONFIG
Configure the L2 Protocol parameters for the SHDSL interface using ATM protocol.
L2 PROTOCOL (SHDSL - ATM) > CONFIG > ATM CONFIG
Use the ATM config menu to set the parameters listed below.
L2 PROTOCOL (SHDSL - ATM) > CONFIG > ATM CONFIG > IDLE CELLS
The Idle Cells format must be configured for either ATM FORUM (UNASSIGNED) or ITU (IDLE). Configuring
this setting incorrectly for a particular circuit will cause poor performance at the ATM Layer. The default is
ATM FORUM (UNASSIGNED).
L2 PROTOCOL (SHDSL - ATM) > CONFIG > ATM CONFIG > DATA SCRAMBLING
DATA SCRAMBLING can be ENABLED or DISABLED for cell traffic. Configuring this setting incorrectly for a
particular circuit will cause poor performance at the ATM Layer.
L2 PROTOCOL (SHDSL - ATM) > CONFIG > ATM CONFIG > HEC COSET
Header Error Control is located in the last (5th) byte of the ATM cell header that checks for cell integrity
only. The Coset polynomial is applied to the received HEC for comparison with the HEC generated
internally. HEC errors may be detected after synchronization any bit errors detected will prompt that cell
be dropped. The choice are
ENABLED or DISABLED. The default is ENABLED.
L2 PROTOCOL (SHDSL - ATM) > CONFIG > PVC CONFIG
Configure up to six ATM PVCs from this menu.
L2 PROTOCOL (SHDSL - ATM) > CONFIG > PVC CONFIG > NUM
Displays the index number for the PVC entry.
The setting must match the configuration setting of the ATM switch or DSLAM at the other
end of the circuit.
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