ACC HDLC/LAP-B (ABM) User's Guide

Chapter 4 51
Protocol Specific Configuration
Poll/Select Configuration Values
Poll/Select Configuration Values
Poll Word
DTE/DCE Operating mode - DTE or DCE
Max I-field Largest I-field allowed (in bytes)
Select Word
T1 L2 acknowledgment Timer
K Frame level Tx window
N2 Number of Tx retries allowed
Poll Word
Figure 4-1 Poll Word Format
T/C Configure port as a D CE or DTE:
0=PorttoactasDCE
1=PorttoactasDTE
Max I-field Maximum number of bytes is the largest acceptable
I field. Values from 1 to 10,066 bytes . Note that the
backplane mechanism limits the largest possible
transmitted size to 10,066 bytes (rather than 16,383).
NOTE
Some ACC interface cards have li mited buffering capacity. Large window
sizes should be used with caution, especially with large frame sizes, as
the buffering capacity of the ACC interface may be exceeded.
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T/C -0- Maximum I-Field size (1-16383 bytes) See following note.