![](/images/backgrounds/142068/bg2b.png)
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 ■43
EIA-530 PIC