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73M2901CE line-in-use / parallel pick up detection

Posted: 18 May 2011     Print Version  Bookmark and Share

Keywords:integrated circuit modem  .22 bis 2400 

The 73M2901CE integrated circuit modem provides microprocessor control, modulation, and demodulation functions required to implement a V.22 bis 2400 bit/s modem. Embedded modems can be found in a wide variety of products. In consumer products built for a residential environment, it is very likely that the modem will share the same phone line as the household's main phone or fax equipment. The embedded modems are typically considered a lowest priority device and should never take the line if other equipment is already using it. The feature of detecting whether the line is being used before the modem attempts to call is referred to as "Line-In-Use" detection. Expanding on this concept, if an embedded modem is already connected, it should be able to detect when another device attempts to place a call and must release the line. The feature of detecting the call attempts while off hook is referred as "Parallel Pick Up" detection or "911 detection" since this capability prevents the device potentially blocking an emergency call. When the modem has released the line, the other calling equipment (phone or fax) will need to hang up to get a dial tone, but the line is free again for the user to make a call.

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