56K Nostalgia
What the lights on a modem mean:
TR Terminal Ready Illuminated when terminal software is activated
HS High Speed Illuminated during K56flex connections (32.000 to 56.000 bps)
CD Carrier Detect The modem is connected with another modem.
AA Auto Answer The modem is ready to answer incoming calls automatically.
OH Off Hook The modem has picked up the phone line, just like taking your phone handset “off hook.”
SD Send Data Flashes as data are sent.
RD Receive Data Flashes as data are received.
PWR Power The modem is receiving power.