Upon detection of a trigger, such as the exceeding of an error threshold or the direction of a user, a diagnostic link system enters a diagnostic information transmission mode. This diagnostic information transmission mode allows for two modems to exchange diagnostic and/or test information that may not otherwise be exchangeable during normal communication. The diagnostic information transmission mode is initiated by transmitting an initiate diagnostic link mode message to a receiving modem accompanied by a cyclic redundancy check (CRC). The receiving modem determines, based on the CRC, if a robust communications channel is present. If a robust communications channel is present, the two modems can initiate exchange of the diagnostic and/or test information. Otherwise, the transmission power of the transmitting modem is increased and the initiate diagnostic link mode message re-transmitted to the receiving modem until the CRC is determined to be correct.

A system for use in locating and testing a cable having a first end connected to a first connector and a second end connected to a second connector where the second connector is one of a plurality of connectors within a patch panel. The system includes a first device having a first cable certification and test circuitry which is couplable to the first connector and a second device having a second cable certification and test circuitry which is couplable to the second connector. One of the first device and the second device further includes circuitry for generating a tone signal that is to be applied to the cable and the other one of the first device and the second device further includes a probe for receiving the tone signal and for generating an output indicative of a strength of the received tone signal.

An embodiment of the system for publishing events of a telephony application to a client includes a call router that generates events from the telephony application and an event router that manages the publication of events generated by the call router and that manages the subscription to events by clients. The system can be used with a telephony application that interfaces with a telephony device and an application server

A method of operating a captioned telephone comprising the steps of dialing a telephone number to a relay gateway, connecting to the gateway over a communication network, performing a test to assess communication network quality, based on the test results, setting up the captioned telephone to operate in at least one of a first mode and a second mode wherein each of the first and second modes is one of (i) a PSTN mode in which data is communicated between the captioned telephone and the relay gateway via analog transmission and (ii) an IP mode in which data is communicated between the captioned telephone and the relay gateway via the Internet.

The present invention relates to an apparatus and a method for load balancing among multi-ports in reverse power feeding, and more particularly, to an apparatus and a method which, in the process in which a distribution apparatus performs load balancing among multi-ports by reversely receiving power from multiple customer premises at a distribution point, when reverse power feeding from a specific customer premise is stopped, since a power burden of a remaining customer premise is increased, which interfere with a communication service, can reduce power consumption on the distribution by releasing a link of a communication port connected with the corresponding customer premise as soon as the power feeding is stopped and provide a stable communication service by performing the load balancing only with respect to remaining communication ports.

An embodiment of the system for publishing events of a telephony application to a client includes a call router that generates events from the telephony application and an event router that manages the publication of events generated by the call router and that manages the subscription to events by clients. The system can be used with a telephony application that interfaces with a telephony device and an application server.

Described is a method for performance estimation of a communication device. The method comprises: executing active probing to determine active probing data; reading operational data which includes data related to channel and its noise condition, latency and counter values related to user data traffic between the communication device and another communication device, wherein the operational data is relevant to the current settings of the communication device; and training a performance estimation algorithm for the communication device according to the active probing data and the operational data.

A method of operating a captioned telephone comprising the steps of dialing a telephone number to a relay gateway, connecting to the gateway over a communication network, performing a test to assess communication network quality, based on the test results, setting up the captioned telephone to operate in at least one of a first mode and a second mode wherein each of the first and second modes is one of (i) a PSTN mode in which data is communicated between the captioned telephone and the relay gateway via analog transmission and (ii) an IP mode in which data is communicated between the captioned telephone and the relay gateway via the Internet.

The invention relates to a phase detection method (200) comprising the following steps: receiving (201) a receiving sequence (Y.sub.j) of values (Y.sub.0, Y.sub.1, . . . , Y.sub.N1) of a receiving signal (Y), said values (Y.sub.0, Y.sub.1, . . . , Y.sub.N1) having been sampled with a known sampling frequency f.sub.s and said receiving signal (Y) representing a reaction to a transmitting signal having a known transmitting frequency f.sub.w; providing (202) a sine sequence (S.sub.j) and a cosine sequence (C.sub.j) for each index (j) of the receiving sequence (Y.sub.j), said sine sequence (S.sub.j) comprising sine values of consecutive multiples of a known circular frequency, which depends on the transmitting frequency and the sampling frequency, and said cosine sequence (C.sub.j) comprising cosine values of consecutive multiples of the known circular frequency; and determining (203) a phase real part (U) of the receiving signal (Y) based on a scalar product of the receiving sequence (Y.sub.j) with the cosine sequence (C.sub.j) and a phase imaginary part (V) of the receiving signal based on a scalar product of the receiving sequence (Y.sub.j) with the sine sequence (S.sub.j).

Described is a method for performance estimation of a communication device. The method comprises: executing active probing to determine active probing data; reading operational data which includes data related to channel and its noise condition, latency and counter values related to user data traffic between the communication device and another communication device, wherein the operational data is relevant to the current settings of the communication device; and training a performance estimation algorithm for the communication device according to the active probing data and the operational data.