The following acronyms are used with the display lights on an external modem to identify the unit's current status. For some functions, there is more than one acronym that can be used.
Acronym Meaning
AA Auto answer mode
CA Compression active
CD Carrier detect
CTR Clear to receive
CTS Clear to send
DTR Data terminal ready (terminal ready)
EC Error control active
HS High speed (typically 4,800 bps and up)
LB Low battery
MR Modem ready (data set ready)
OH Off hook
PWR Power on
RI Ringing
RNG Ringing
RTS Request to send
RXD Receiving data
RD Receiving data
SD Transmitting (sending) data
TD Transmitting (sending) data
TXD Transmitting (sending) data
TM Test mode
TR Terminal ready
External modems have the advantage of status lights, which are very helpful when troubleshooting the line.
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