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Three bicolor per port:
■
Data set ready (DSR):
■
Green—DSR is detected or ignored
■
Red—DSR expected but not present
■
Data carrier detect (DCD):
■
Green—DCD is detected or ignored
■
Red—DCD expected but not present
■
Resynchronization:
■
Green—Keepalives are being received
■
Red—Data terminal ready (DTR) toggled from low to high (resynchronization pulses
are being sent)
LEDs
■
Per-port packet and byte counters
■
Resynchronization counters:
■
Number of resynchronizations initiated
■
Time of last resynchronization
Instrumentation
(counters)
EIA-530 PIC ■ 41
EIA-530 PIC