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| Appendix F - Pin Descriptions |
Label | Pin | I/O type | Signal name/description |
RDL | 21 | RDL | Remote Digital Loop Input to modem to enable RDL test. |
RI | 22 |
| Ring Indicator RI output high indicates the presence of |
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| a ring signal on the telephone line. |
| 23 |
| NC |
XCLK | 24 | XCLK | External Clock Input to modem used in special |
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| synchronous applications. |
TM | 25 | TM | Test Mode Output from modem to indicate modem is in |
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| one of the test modes. |
RS-232 Cable Pinouts
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| TD | 2 |
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| RD | 3 |
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| RTS | 4 |
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| CTS | 5 |
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| DSR | 6 |
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| CD | 8 |
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| DTR 20 |
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Fig.
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| DTE | DCE |
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| TD | 3 |
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| RD | 2 |
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| RTS | 7 |
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| CTS | 8 |
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| DSR | 6 |
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| CD | 1 |
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| DTR | 4 |
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| RI | 9 |
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Fig.
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