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The signals are:

TXD - Transmitted Data

RXD - Received Data

RTS - Request To Send

CTS - Clear To Send

DSR - Data Set Ready

DCD - Data Carrier Detect

SDCD - Secondary received line signal detect

SCTS - Secondary Clear To Send

STD - Secondary Transmitted Data

TC - Transmitter Clock

SRD - Secondary Received Data

RC - Receiver Clock

SRTS - Secondary Request To Send

DTR - Data Terminal Ready

SQ - Signal Quality

RI - Ring Indicator

ETC - External Transmitter Clock

There are also connections for:

FG - Frame protective Ground

SG - Signal Ground

Depending upon application most signals are not used; many just use TXD, RXD and SG.

For use with a modem the lines used could be: RI, DTR, DCD, DSR, RTS, CTS, TXD, RXD, SG.

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