72Appendix A Technical specifications
Figure 18 Modem cable (9-pin D-sub plug to RS-232-C modem plug)
10 ft
(3.05 m)
Pin 5 | Pin 1 |
Pin 9 | Pin 6 |
Pin 1 | Pin 13 |
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Pin 14 | Pin 25 |
CAB0056A
The following table provides the multiple DB9 and DB25 serial interface cable pinouts.
Table 19 Multiple DB9 and DB25 connector pinouts
Serial port |
| Serial port |
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| Serial port |
| Serial port |
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DB9 connector | DB25 connector |
| DB25 connector | DB9 connector | ||||
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Pinout | Signal | Pinout | Signal |
| Pinout | Signal | Pinout | Signal |
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2 | RXD | 3 | TXD | > | 2 | RXD | 3 | TXD |
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3 | TXD | 2 | RXD | > | 3 | TXD | 2 | RXD |
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4 | DTR | 20 | DSR | > | 6 | DTR | 6 | DSR |
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5 | Ground | 7 | Ground | > | 7 | Ground | 5 | Ground |
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6 | DSR | 6 | DTR | > | 20 | DSR | 4 | DTR |
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7 | RTS | 4 | RTS | > | 5 | CTS | 8 | CTS |
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8 | CTS | 5 | CTS | > | 4 | RTS | 7 | RTS |
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Modem cable specifications
If you need to connect a modem to a VPN Router 1750, you must obtain an appropriate modem cable. The modem cable must have a