Topic
Answer tone
About: Answer tone is a research topic. Over the lifetime, 26 publications have been published within this topic receiving 196 citations.
Papers
Patent•
16 Apr 1993TL;DR: In this article, a low-level identification signal is hidden within an industry standard "answer tone", e.g., a CCITT V.25 answer tone of 2100 Hz.
Abstract: In the public switched telephone network, an originating modem can identify an answering modem, e.g., as to the type of modem it is, by detection of a low-level identification signal sent from the answering modem. The low-level identification signal is hidden within an industry standard "answer tone," e.g., a CCITT V.25 answer tone of 2100 Hz. If the low-level identification signal is detected by the originating modem, the industry standard "handshaking" procedure is terminated and a non-standard handshaking procedure is implemented. If the identification signal is not detected by the originating modem, the industry standard handshaking procedure is simply completed.
51 citations
Patent•
AT&T1
TL;DR: In this paper, the connect sequence of a V.32 compatible modem is modified so that it will automatically determine if the other modem, whether the originating modem or the answering modem, is a 208B type of modem or a V., and then switch to either a half-duplex mode or a full-diagram mode of operation as appropriate.
Abstract: A V.32 compatible modem provides a full-duplex mode of operation, while a 208B compatible modem provides a half-duplex mode of operation. The connect sequence of a V.32 compatible modem is modified so that it will automatically determine if the other modem, whether the originating modem or the answering modem, is a 208B type of modem or a V.32 type of modem. In one embodiment of the invention, the connect sequence of an originating V.32 modem is modified to detect either a 2100 Hz answer tone, which represents that the answering modem is a V.32 type of modem, or a 2021 Hz answer tone, which represents that the answering modem is a 208B type of modem. In another embodiment of the invention, the connect sequence of an answering V.32 modem is modified to transmit first a 2100 Hz answer tone and then, if no 1800 Hz V.32 signal "AA" is received from the originating modem, to transmit a 2021 Hz answer tone, thereby simulating a 208B modem has answered the data call. In either case, once the identity of the other modem is determined, this modified modem will then switch to either a half-duplex mode or a full-duplex mode of operation as appropriate.
44 citations
Patent•
19 Mar 1982
TL;DR: In this paper, a method and apparatus are described for automatically placing a modem in the answer or originate mode of operation without the use of a ring detector or a manually operated answer/originate mode selection switch.
Abstract: A method and apparatus are described for automatically placing a modem in the answer or originate mode of operation without the use of a ring detector or a manually operated answer/originate mode selection switch. A timer and two latches are connected in the modem in such a fashion that when the modem is switched into operation it is in the originate mode. For a period of time determined by the timer, the modem looks for the receipt of an answer tone from a remotely located modem. If the answer tone is detected within this time, the modem remains in the originate mode and completes a handshaking sequence with the remote modem. If, however, the answer tone is not received, the modem automatically switches to the answer mode of operation and transmits an answer tone as part of the handshaking sequence.
20 citations
Patent•
17 Sep 1999TL;DR: In this paper, a method and apparatus for measuring call setup time is presented, where a first device in a network sends a signal to a second device and adjusts an answer tone setting for the second device based on the response.
Abstract: A method and apparatus for measuring call setup time is presented. A first device in a network sends a signal to a second device. The first device monitors for a response from the second device and adjusts an answer tone setting for the second device based on the response. After which, the first device calculates an elapsed time between sending the signal and a receipt of the response.
18 citations
Patent•
24 Sep 2002
TL;DR: In this paper, the answering-side gateway and first classification signal are transmitted to a calling side gateway that generates an answer tone in response to the signal, and then a second classification signal may be transmitted to the calling-sender gateway that adjusts the answer tone.
Abstract: Answer tone received at answering-side gateway and first classification signal is transmitted to a calling-side gateway that generates an answer tone in response to the signal. A second classification signal may be transmitted to the calling-side gateway that adjusts the answer tone in response to the second signal.
11 citations
Performance Metrics
| Year | Papers |
|---|---|
| 2016 | 1 |
| 2008 | 2 |
| 2003 | 1 |
| 2002 | 2 |
| 2001 | 1 |
| 2000 | 1 |