Adtran 544r Manual Técnico

Total Access 544R System Manual

Section 4  SHDSL RCU ATM User Interface Guide

61200704L2-1B

© 2003 ADTRAN, Inc.

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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.

Configure the L2 Protocol parameters for the SHDSL interface using ATM protocol.

Use the ATM config menu to set the parameters listed below.

The Idle Cells format must be configured for either 

 or 

. Configuring 

this setting incorrectly for a particular circuit will cause poor performance at the ATM Layer. The default is 

.

 can be 

 or 

 for cell traffic. Configuring this setting incorrectly for a 

particular circuit will cause poor performance at the ATM Layer.

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 

 or 

. The default is 

.

Configure up to six ATM PVCs from this menu.

Displays the index number for the PVC entry.