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VX4380 256-Crosspoint Relay Matrix Module User Manual
1–13
incrementing r (the row number) from 1 through 4 for each value of c and s
while incrementing c (the column number) from 1 through 16 for each value of s
(the section number) from 1 through 4 to close the two-wire switch path from
row r to column c of each section s. Check for continuity of the two paths each
time.
By testing in this manner, it can be verified that the module is operational.
SYSFAIL* becomes active during power-on, hard or soft reset, or self test, or if
the module loses any of its power voltages. When the mainframe Resource
Manager detects SYSFAIL* set, it will attempt to inhibit the line. This causes
the VX4380 256-Crosspoint Relay Matrix Module to deactivate SYSFAIL*
except when +5 V power is lost on the relay module on which it is installed.
SYSFAIL* Operation