![](/images/new-backgrounds/1110102/11010215x1.webp)
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| Chapter 2 Mechanical Specifications | |
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36 | O | Ring Indicate. | |||
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| of a ring signal on the telephone line. The modem will not go |
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| RI is active; the modem waits for |
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| 37 |
| O | Data Set Ready. |
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| (high) indicates that the DTE is to disregard all signals appearing on the |
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| interchange circuits except Ring Indicator |
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| local data set, and does not indicate an actual link with any remote data |
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| equipment. |
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| 38 |
| O | Clear To Send. |
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| the modem is ready to transmit data. |
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| signals presented on TXD will be transmitted to the telephone line. |
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| indicates to the DTE that it should not transfer data across the interface on |
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| TXD. |
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| 39 |
| O | Data Carrier Detect. |
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| the telephone line or OFF (high) when carrier is not detected. |
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| 40 |
| I | Data Terminal Ready (Active Low). The |
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| the DTE when the DTE is ready to transmit or receive data. |
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| prepares the modem to be connected to the telephone line, and, once |
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| connected, maintains the connection. |
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| disconnect state. |
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| 41 | DGND |
| Ground. |
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61 | VCC |
| 3.3V DC Power. | ||
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63 | AGND |
| Analog Ground. Analog ground is tied common with DGND on the | ||
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| SocketModem. To minimize potential ground noise issues, connect audio |
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| circuit return to AGND. |
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| 64 | SPKR |
| Speaker Output. SPKR is a single |
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| CODEC. One side of a differential AC output coupled through a 6.8K ohm |
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| resistor and capacitor. |
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| The call progress speaker interface signal is: |
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| Digital speaker output (DSPKOUT); output |
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| DSPKOUT is a square wave output in data mode used for call progress or |
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| carrier monitoring. This output can be optionally connected to a |
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| board speaker, e.g., a sounducer, or to an analog speaker circuit. |
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8 |