
B-63354EN/04 VI. MAINTENANCE 1.Series 16i
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i MAINTENENCE INFORMATION
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1.4.1 Determining the Communications Line Status
The most probable causes of a poor communications line status are as
follows:
u Excessive traffic on the communications line.
u Excessive electrical noise on the communications line.
When there is a considerable amount of traffic on the communications
line, the value of the R COLLISION item increases. In the figure below,
the two bytes of data from address 0x410031B0 are the numerical
values of R COLLISION.
When there is a considerable amount of electrical noise on the
communications line, the values of the R ALIGNMENT, R
SHORTFRAME and R CRCERROR items increase. In the figure
below, the two bytes of data from address 0x41003170 are the
numerical values of R ALIGNMENT. The two bytes of data from
address 0x41003180 are the numerical values of R SHORTFRAME.
The two bytes of data from address 0x41003190 are the numerical
values of R CRCERROR.
These
numerical
values increase
as electrical
This numerical
value increases
as traffic