CNET GLOSSARY: Terms for the techie
A modem indicator light that tells you the modem is ready to answer the phone, as long as there's a communication program running and prepared to handle the call. The light is often not on even when the modem is prepared to take a call, so it's not a useful indicator. Other modem indicator lights: CD, HS, MR, OH, RD, SD, and TR.
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