3Com 000839-08 Manual
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Contents
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T ECHNICAL Q UICK REFERENCE144Front Panel Lights (External Modems)Symbol Meaning StatusAA ........ Auto Answer.................Answer mode: ON when register S0 is set to 1 or higher (AutoAnswer), and when answering a call; OFF when modem originatesa call. Light flashes when there is an incoming call.CD......... Carrier Detect ...............ON if modem receives a valid data signal (carrier) from a remotemodem, indicating that data transmission is possible. Always ON ifCD override is ON (&C0).RD......... Received Data...............Flashes when modem sends result codes or passes received databits from remote.SD ......... Send Data .....................Flashes when computer sends a data bit to the modem.TR ......... Data Terminal Ready .....ON if modem receives a DTR signal from computer. Always ON(modem ignores DTR) if the DTR override is ON (&D0).CS ......... Clear to Send.................ON until modem lowers CTS when Transmit Data hardware flowcontrol is enabled (&H1, &H3).ARQ/ Error Control/FAX....... Fax Operations ..............Data Mode: Automatic Repeat Request. ON if modem is set to &M4 or &M5 andsuccessfully establishes an error control connection. Flashes when modemretransmits data to remote modem. Fax Mode: Flashes to indicate fax mode. |
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