External Modem Indicator Lights.
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MODEM INDICATOR LIGHTS. |
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The majority of external Modems feature LED indicators on the front panel that report the modem status. Your modem may not have ALL these lights and could even use different identifying letter for them. These indicators are normally coloured red, although this in not standard and could differ. |
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Marking |
Meaning |
Modem function |
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PWR |
Power On |
On when power is applied to the modem |
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MR |
Modem Ready |
On when the modem has completed it's self-check. |
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TR (DTR) |
Terminal Ready |
On when DTR signal (from PC) is active |
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SD (TD) |
Send (Transmit) Data |
On when modem is transmitting data to a remote modem |
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RD |
Receive Data |
On when modem is receiving data from a remote modem |
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OH |
Off Hook |
On when modem is off hook |
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HS |
High Speed |
On when connected to High speed link. |
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AA |
Auto Answer |
On when modem is set to accept calls for Answering M/C. |
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CD |
Carrier Detect |
On when remote carrier has been detected |
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RS |
Request to Send |
On when RTS signal is active |
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CS |
Clear to Send |
On when CTS signal is active |
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