CA2278235A1 - Telephone line monitoring device - Google Patents
Telephone line monitoring device Download PDFInfo
- Publication number
- CA2278235A1 CA2278235A1 CA002278235A CA2278235A CA2278235A1 CA 2278235 A1 CA2278235 A1 CA 2278235A1 CA 002278235 A CA002278235 A CA 002278235A CA 2278235 A CA2278235 A CA 2278235A CA 2278235 A1 CA2278235 A1 CA 2278235A1
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- Canada
- Prior art keywords
- premises
- reporting
- monitoring
- wiring
- telephone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
- H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
- H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Alarm Systems (AREA)
- Telephonic Communication Services (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
A standalone telephone line status monitoring and reporting devi ce (10) for use between a subscriber's premises loop and the local telephone network is disclosed. The device operates on loop current, external AC or DC power from the subscriber's premises, or internal battery (61). The device passively monitors the status of the premises loop until an alarm condition is detected.
When premises communications equipment is on-hook or off-hook, the device detects normal Tip-Ring voltage and current conditions. If an open circuit, short circuit, or invalid loop impedance condition is detected, the device indicates a potential fault in the premises wiring. The device then reports the alarm either by visual or audible indications (11), electronically to an external monitoring device, or by auto-dialing one of two preprogrammed telephone numbers. The fault may be reported over wireline telephone line or radio link (21) to the central office or other location. Additionally, when configured for radio link communications with the central office, the device may be remotely reset.
When premises communications equipment is on-hook or off-hook, the device detects normal Tip-Ring voltage and current conditions. If an open circuit, short circuit, or invalid loop impedance condition is detected, the device indicates a potential fault in the premises wiring. The device then reports the alarm either by visual or audible indications (11), electronically to an external monitoring device, or by auto-dialing one of two preprogrammed telephone numbers. The fault may be reported over wireline telephone line or radio link (21) to the central office or other location. Additionally, when configured for radio link communications with the central office, the device may be remotely reset.
Description
TELE;PHON>E: LINE MONITORING DEVICE
Technical Field of the Invention This invention relates to telecommunication systems and, more particularly, to a telephone line status monitoring and reporting device for use between a subscriber's premises loop and a local telephone network.
Description of Related r~
For a business or residential telephone subscriber, service reliability is essential.
When a communications fault occurs, whether on the loop from the Central Office (CO), within the subscriber's premises, or within a telephone or data device, disruption of service can be costly to t>oth the 7.'elephone Operating Company (Telco) and to the end 1 S customer. The Telco may be a wireline or wireless operator to include new Personal Communications Services (PCS) operators and cellular telephone companies (Cellcos).
To restore nornial communications following a fault condition within the subscriber's premises or from the premises to the CO, the fault condition must be detected, and then isolatf;d and located. Fault isolation and location is a critical function to determine responsibility for corrective action. For example, if the fault occurs within the subscriber's premises, the wiring and communications equipment may be the responsibility of the occupant or landlord. However, if the fault occurs between the CO
and the interface with the; customE;r's premises, the Telco has the responsibility to correct the fault.
Several devices currently exist for fault detection, isolation, and localization, however, all of these devices are designed for use with wireline telephone lines, and must be powered from the central office. In parts of many third-world countries, however, wireline telephone lines do not exist. The only way for people in such remote ' areas to obtain telephone: service i s through radio telecommunication systems. For these systems, faults within a subscriber's premnses are not automatically detected and reported. Therefore, tile reliability and availability of such systems is decreased.
Additionally, the capability of testing the integrity and the intensity of the radio at mobile handsets across the air interface is built into the signaling protocol definition for _1_ ., ", 1004-0005 ' r ~ O ..
, , r, , .~ n a s a a a . .. _ . _ . _ a a a a PCS radios such as CDNIA, GSM and TDMA. However, problems may result in the in-building wiring or the radio transmitting device itself.
Although there are no known prior art teachings of a solution to the aforementioned aeficiency and shortcoming such as that disclosed herein, U.S.
Patent S Numbers 4,390,750 to :Bartelink: (Bartelink), 4,446,340 to Fryer (Fryer), 4,817,137 to Rosenfeld et al. (Rosenfeld) and 4,197,435 to Jackson et al. (Jackson) discuss subject matter that bears some relation to matters discussed herein. Bartelink discloses a remote supervisory system for monitoring the status of a subscriber's premises over existing telephone circuits from the central office. Auxiliary equipment at the subscriber's premises is coupled to the subscriber's telephone circuit and includes sensors which monitor the condition of the premises. If an abnormal condition is sensed, the auxiliary equipment notifies the central office which may further notify an action center of the subscriber's identity and nature of the alarm. However, the auxiliary equipment of Bartelink requir;~s contact from the Telco along the wireline from the central office.
Thus, Bartelink does not provide a standalone capability to monitor the subscriber's premises and report alarm conditions without a wireline connection to the central office.
Fryer di~~loses a loopback circuit for testing a telephone line between the central office and a subscriber's equipment. The loopback circuit is located at the subscriber's end of the line and is powered by the normal central office power source.
Fryer injects a signal fiom the central office to actively test the telephone line. Thus, Fryer does not provide a standalone capability;. or a passive capability to monitor the subscriber's premises and report alarm conditions without a wireline connection to the central office.
Rosenfeld discloses an apparatus for monitoring the hook status of a remote telephone. Rosenfeld introduces a disturbance voltage signal onto the subscriber loop from the central office, and then monitors variations in impedence in the subscriber loop.
Thus, Rosenfeld does not provide a standalone capability, or a passive capability to monitor the subscriber's premises and report alarm conditions without a wireline connection to the centrail office.
Jackson discloses a line monitoring circuit for monitoring premises telephone wiring. When a fault is sensed, a relay control is notified, and a connection and switching element discormects the premises line from the central office line.
The circuit AMFNi7Ff1 SHFFT
_ ~ . CA 02278235 1999-07-16 1 a sn;~., a ~wa !sn ~ s a o . ..., ~ ! ! 1 then provides a visual indication to notify a subscriber of the fault. Since the premises wiring is disconnected from the central office line, faults cannot be reported to a remote location.
Review of each of the foregoing references reveals no disclosure or suggestion of a system or method such as that described and claimed herein.
-2a-AMENDED SNFFT
Technical Field of the Invention This invention relates to telecommunication systems and, more particularly, to a telephone line status monitoring and reporting device for use between a subscriber's premises loop and a local telephone network.
Description of Related r~
For a business or residential telephone subscriber, service reliability is essential.
When a communications fault occurs, whether on the loop from the Central Office (CO), within the subscriber's premises, or within a telephone or data device, disruption of service can be costly to t>oth the 7.'elephone Operating Company (Telco) and to the end 1 S customer. The Telco may be a wireline or wireless operator to include new Personal Communications Services (PCS) operators and cellular telephone companies (Cellcos).
To restore nornial communications following a fault condition within the subscriber's premises or from the premises to the CO, the fault condition must be detected, and then isolatf;d and located. Fault isolation and location is a critical function to determine responsibility for corrective action. For example, if the fault occurs within the subscriber's premises, the wiring and communications equipment may be the responsibility of the occupant or landlord. However, if the fault occurs between the CO
and the interface with the; customE;r's premises, the Telco has the responsibility to correct the fault.
Several devices currently exist for fault detection, isolation, and localization, however, all of these devices are designed for use with wireline telephone lines, and must be powered from the central office. In parts of many third-world countries, however, wireline telephone lines do not exist. The only way for people in such remote ' areas to obtain telephone: service i s through radio telecommunication systems. For these systems, faults within a subscriber's premnses are not automatically detected and reported. Therefore, tile reliability and availability of such systems is decreased.
Additionally, the capability of testing the integrity and the intensity of the radio at mobile handsets across the air interface is built into the signaling protocol definition for _1_ ., ", 1004-0005 ' r ~ O ..
, , r, , .~ n a s a a a . .. _ . _ . _ a a a a PCS radios such as CDNIA, GSM and TDMA. However, problems may result in the in-building wiring or the radio transmitting device itself.
Although there are no known prior art teachings of a solution to the aforementioned aeficiency and shortcoming such as that disclosed herein, U.S.
Patent S Numbers 4,390,750 to :Bartelink: (Bartelink), 4,446,340 to Fryer (Fryer), 4,817,137 to Rosenfeld et al. (Rosenfeld) and 4,197,435 to Jackson et al. (Jackson) discuss subject matter that bears some relation to matters discussed herein. Bartelink discloses a remote supervisory system for monitoring the status of a subscriber's premises over existing telephone circuits from the central office. Auxiliary equipment at the subscriber's premises is coupled to the subscriber's telephone circuit and includes sensors which monitor the condition of the premises. If an abnormal condition is sensed, the auxiliary equipment notifies the central office which may further notify an action center of the subscriber's identity and nature of the alarm. However, the auxiliary equipment of Bartelink requir;~s contact from the Telco along the wireline from the central office.
Thus, Bartelink does not provide a standalone capability to monitor the subscriber's premises and report alarm conditions without a wireline connection to the central office.
Fryer di~~loses a loopback circuit for testing a telephone line between the central office and a subscriber's equipment. The loopback circuit is located at the subscriber's end of the line and is powered by the normal central office power source.
Fryer injects a signal fiom the central office to actively test the telephone line. Thus, Fryer does not provide a standalone capability;. or a passive capability to monitor the subscriber's premises and report alarm conditions without a wireline connection to the central office.
Rosenfeld discloses an apparatus for monitoring the hook status of a remote telephone. Rosenfeld introduces a disturbance voltage signal onto the subscriber loop from the central office, and then monitors variations in impedence in the subscriber loop.
Thus, Rosenfeld does not provide a standalone capability, or a passive capability to monitor the subscriber's premises and report alarm conditions without a wireline connection to the centrail office.
Jackson discloses a line monitoring circuit for monitoring premises telephone wiring. When a fault is sensed, a relay control is notified, and a connection and switching element discormects the premises line from the central office line.
The circuit AMFNi7Ff1 SHFFT
_ ~ . CA 02278235 1999-07-16 1 a sn;~., a ~wa !sn ~ s a o . ..., ~ ! ! 1 then provides a visual indication to notify a subscriber of the fault. Since the premises wiring is disconnected from the central office line, faults cannot be reported to a remote location.
Review of each of the foregoing references reveals no disclosure or suggestion of a system or method such as that described and claimed herein.
-2a-AMENDED SNFFT
In order to overcome the disadvantage of existing solutions, it would be advantageous to have a :standalone telephone line status monitoring and reporting device for use between a subscriber's premises loop and the local telephone network.
The device would passively monitor the status of the premises loop until an alarm condition is detected, and would then report the alarm either by visual or audible indications, electronically to an external monitoring device, or by auto-dialing a telephone number to the central once or other location. The device would report the fault over wireline or radio link to the central office or other location. The present invention provides such a device.
SUMMARY OF THE INVENTION
In one aspect, the present invention is a standalone device for passively monitoring the status oi" premises telephone wiring, and reporting faults in the wiring either by visual or audible indications, electronically to an external monitoring device, or by auto-dialing a wi:reline or radio telephone number to the central office or other location designated by t:he telephone operating company.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and its numerous objects and advantages will become more app~~rent to those skilled in the art by reference to the following drawing, in conjunction. with the: accompanying specification, in which:
FIG. 1 is a simplified block diagram of a first embodiment of the monitoring device of the present invention implemented as a standalone unit;
FIG. 2 is a simpllified block diagram of a second embodiment of the monitoring device of the present invention implemented as a monitoring module which is interconnected to a Wireless Subscriber Unit (WSU); and FIG. 3 is a schematic diagram of the preferred embodiment of a monitoring circuit within the monitoring device of the present invention.
DETAILED DESCRIPTION' OF EMBODIMENTS
The invention is a telephone line status monitoring and reporting device for use between a subscriber's premises loop and the local telephone network. The device may operate on the loop current, external AC or DC power from the premises, or an internal battery. The device passively monitors the status of the premises loop until an alarm condition is detected. At that time, an alarm is reported either by visual or audible indications, electronically to an external monitoring device, or by auto-dialing a telephone number to the central office or other location.
Under normal operational conditions, when premises communications equipment is on-hook or off hook, the present invention detects normal Tip-Ring voltage and current conditions. If an open circuit, short circuit, or invalid loop impedance condition is detected, the present invention indicates a potential fault in the premises wiring.
FIG. 1 is a simplified schematic diagram of a first embodiment of the monitoring device of the present invention implemented as a standalone unit. A separate standalone unit 10 is installed on each line in the subscriber's premises. Each standalone unit may independently supply the subscriber, a repair person, or the Telco with an indication that a fault condition has occurred on the line on which the unit is installed.
Thus, if the repair person for the premises wiring is independent of the Telco, he will have on premises feedback that a wiring error has been successfully corrected before leaving the premises.
The standalone unit is installed within the subscriber's premises as close as possible to the Tip (T)-Ring(R) entry point from the telephone network. The standalone unit 10 may be programmed with a plurality of telephone numbers to which specific alarm conditions may be reported. In the preferred embodiment, the standalone unit 10 may be programmed with up to two telephone numbers. When switch SW 1 is in a closed position at P1, a first telephone number of up to ten digits may be programmed from a standard touch tone (DTMF) premises telephone. A second telephone number of up to ten digits may be programmed when switch SWl is in position P2. In case of a power failure, the standalone unit provides a transparent connection from the subscriber's premises to the telephone network.
The device would passively monitor the status of the premises loop until an alarm condition is detected, and would then report the alarm either by visual or audible indications, electronically to an external monitoring device, or by auto-dialing a telephone number to the central once or other location. The device would report the fault over wireline or radio link to the central office or other location. The present invention provides such a device.
SUMMARY OF THE INVENTION
In one aspect, the present invention is a standalone device for passively monitoring the status oi" premises telephone wiring, and reporting faults in the wiring either by visual or audible indications, electronically to an external monitoring device, or by auto-dialing a wi:reline or radio telephone number to the central office or other location designated by t:he telephone operating company.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and its numerous objects and advantages will become more app~~rent to those skilled in the art by reference to the following drawing, in conjunction. with the: accompanying specification, in which:
FIG. 1 is a simplified block diagram of a first embodiment of the monitoring device of the present invention implemented as a standalone unit;
FIG. 2 is a simpllified block diagram of a second embodiment of the monitoring device of the present invention implemented as a monitoring module which is interconnected to a Wireless Subscriber Unit (WSU); and FIG. 3 is a schematic diagram of the preferred embodiment of a monitoring circuit within the monitoring device of the present invention.
DETAILED DESCRIPTION' OF EMBODIMENTS
The invention is a telephone line status monitoring and reporting device for use between a subscriber's premises loop and the local telephone network. The device may operate on the loop current, external AC or DC power from the premises, or an internal battery. The device passively monitors the status of the premises loop until an alarm condition is detected. At that time, an alarm is reported either by visual or audible indications, electronically to an external monitoring device, or by auto-dialing a telephone number to the central office or other location.
Under normal operational conditions, when premises communications equipment is on-hook or off hook, the present invention detects normal Tip-Ring voltage and current conditions. If an open circuit, short circuit, or invalid loop impedance condition is detected, the present invention indicates a potential fault in the premises wiring.
FIG. 1 is a simplified schematic diagram of a first embodiment of the monitoring device of the present invention implemented as a standalone unit. A separate standalone unit 10 is installed on each line in the subscriber's premises. Each standalone unit may independently supply the subscriber, a repair person, or the Telco with an indication that a fault condition has occurred on the line on which the unit is installed.
Thus, if the repair person for the premises wiring is independent of the Telco, he will have on premises feedback that a wiring error has been successfully corrected before leaving the premises.
The standalone unit is installed within the subscriber's premises as close as possible to the Tip (T)-Ring(R) entry point from the telephone network. The standalone unit 10 may be programmed with a plurality of telephone numbers to which specific alarm conditions may be reported. In the preferred embodiment, the standalone unit 10 may be programmed with up to two telephone numbers. When switch SW 1 is in a closed position at P1, a first telephone number of up to ten digits may be programmed from a standard touch tone (DTMF) premises telephone. A second telephone number of up to ten digits may be programmed when switch SWl is in position P2. In case of a power failure, the standalone unit provides a transparent connection from the subscriber's premises to the telephone network.
An indicator 11 such as, for example a LED indicator, indicates the status of the premises telephone wiring and whether the monitor is in a monitor mode or a program mode. The monitor is automatically in the monitor mode unless a reporting telephone number is being programmed.
FIG. 2 is a simplified block diagram of a second embodiment of the monitoring device of the present invention implemented as a monitoring module 20 which is interconnected to a Wireless Subscriber Unit (WSU) 21. The WSU 21 provides a radio communications interconnection from the subscriber's premises to a telephone network.
The monitoring module 20 ma,y be internal to the WSU 21, or may be externally connected to the WSU :? 1.
The WSU 21 ma:y provide an interface for a single wireless transmit and receive path (TRX) for a specii:ied radio technology such as from Ericsson (DECT and PCS
1900), Nortel (CDMA, GSM and TDMA), National Panasonic (PACs and PHS), Mitsubishi (PHS), Qualcom (CD:MA), Motorola (CDMA and PACs), Nokia (PCS 1900 1 S and PACs), and Lucent (CDMA and PACs). In addition, the WSU 21 may provide a data adapter for personal computer (PC) and facsimile (FAX) communication. In such a situation, the WSU 21 may be connected directly to the PC or FAX device, without the use of premises telecorrununications wiring.
In the configuration shown in FIG. 2, the monitoring module 20 is DC powered from the WSU 21, and is connected to the WSU by a six-pin connector or cable.
The pins are labeled T (in)., R (in), V+, V-, PS 1, and PS2. The monitoring module communicates the status; of the premises telephone wiring to the WSU 21 via logic pins PS 1 and PS2. Additionally, the monitoring module 20 may be reset remotely through the logic pins PS l and P'S2. The premises telephone wiring is connected to the T (out) and R (out) pins off the monitoring module, and the DC power source is connected to pins V+ and V-.
Either embodinnent of the monitoring and reporting device of the present invention may be integrated with a premises security alarm system. A fault condition in the premises wiring; is then reported by the security alarm system to a central monitoring center.
FIG. 2 is a simplified block diagram of a second embodiment of the monitoring device of the present invention implemented as a monitoring module 20 which is interconnected to a Wireless Subscriber Unit (WSU) 21. The WSU 21 provides a radio communications interconnection from the subscriber's premises to a telephone network.
The monitoring module 20 ma,y be internal to the WSU 21, or may be externally connected to the WSU :? 1.
The WSU 21 ma:y provide an interface for a single wireless transmit and receive path (TRX) for a specii:ied radio technology such as from Ericsson (DECT and PCS
1900), Nortel (CDMA, GSM and TDMA), National Panasonic (PACs and PHS), Mitsubishi (PHS), Qualcom (CD:MA), Motorola (CDMA and PACs), Nokia (PCS 1900 1 S and PACs), and Lucent (CDMA and PACs). In addition, the WSU 21 may provide a data adapter for personal computer (PC) and facsimile (FAX) communication. In such a situation, the WSU 21 may be connected directly to the PC or FAX device, without the use of premises telecorrununications wiring.
In the configuration shown in FIG. 2, the monitoring module 20 is DC powered from the WSU 21, and is connected to the WSU by a six-pin connector or cable.
The pins are labeled T (in)., R (in), V+, V-, PS 1, and PS2. The monitoring module communicates the status; of the premises telephone wiring to the WSU 21 via logic pins PS 1 and PS2. Additionally, the monitoring module 20 may be reset remotely through the logic pins PS l and P'S2. The premises telephone wiring is connected to the T (out) and R (out) pins off the monitoring module, and the DC power source is connected to pins V+ and V-.
Either embodinnent of the monitoring and reporting device of the present invention may be integrated with a premises security alarm system. A fault condition in the premises wiring; is then reported by the security alarm system to a central monitoring center.
FIG. 3 is a schematic diagram of the preferred embodiment of a monitoring circuit within the monitoring device of the present invention. The monitoring circuit 31 includes a LM 741 Linear Operational Amplifier 33 which operates as a comparator device, a phone (in) 35 having a T(in) pin 37 and a R(in) pin 39, and two phone (out) connections 41 and 43 . Phone (out) connection ( 1 ) 41 includes a T, (out) pin 45 and a R,(out) pin 47, and phone (out) connection (2) 43 includes a TZ(out) pin 49 and a RZ(out) pin 51. The circuit also includes a 2N3904 transistor 53 which functions as an emitter-follower circuit, a first LED (LED 1) 55, a second LED {LED 2) 57, a test point (TP) 59, and a power source 61.
The LM 741 comparator 33 is an off the-shelf linear operational amplifier and is used in the inverting mode. The phone (in) connection 35 is an interface between the monitoring circuit 31 and the Telco via the Tip-Ring connections of pins T(in) 37 and R(in) 39. The TP 59 is a test point for on-site troubleshooting or installation testing of the monitoring circuit 31.
Phone (out) connection ( 1 ) 41 provides a Tip-Ring interface to the premises wiring pins T, (out) 45 and R)(out) 47. Phone (out) connection (2) 43 provides an auxiliary output through the pins TZ(out) 49 and RZ(out) S 1. The auxiliary output, phone (out) connection (2) 43, may be utilized for example, when the WSU 21 (FIG. 2) is connected across a Tip-Ring connection, and the integrity of the wiring from the WSU
21 to the Tip-Ring connection needs to be specifically monitored.
Additionally, an auxiliary output may be implemented to interface the monitoring and reporting device with a premises security alarm system.
If the Telco Tip-Ring interface at T(in) 37 and R(in) 39 is either open circuited or short circuited, the LM 741 comparator 33 applies a positive bias to the transistor 53. This opens the circuit to LED 1 and LED 2, and to phone (out) connection ( 1 ) 41 and phone (out) connection (2) 43. The status at the interface of the premises is reflected on LED 1 and LED 2, which are status ir.Uicators a addition, if an abnormal impedance condition occurs in the premises wiring, such as a short-circuit across out ( 1 ), LED l and LED 2 also indicate the change in status.
Although LED 1 and LED 2 are used in FIG. 3 as indicators, other methods may be employed to report the status of the system. For example, an emitter-follower circuit ' 7 T h A
_ .., ...
~~ .. ..
such as transistor 53 may be utilized to drive digital NAND gates providing a TTL logic output to ,indicate circuit status and also provide an optional direct digital interface into the WSU 21 for wiring status :reporting. Additionally, sound emitters may be used instead of or in addition to LED indicators to provide an audible indication of an abnormal status.
The power source 61 normally provides 12 volt DC power. The DC power could optionally be provided by the WSU 21.
AAAFAUICf~ f~t trr-T
The LM 741 comparator 33 is an off the-shelf linear operational amplifier and is used in the inverting mode. The phone (in) connection 35 is an interface between the monitoring circuit 31 and the Telco via the Tip-Ring connections of pins T(in) 37 and R(in) 39. The TP 59 is a test point for on-site troubleshooting or installation testing of the monitoring circuit 31.
Phone (out) connection ( 1 ) 41 provides a Tip-Ring interface to the premises wiring pins T, (out) 45 and R)(out) 47. Phone (out) connection (2) 43 provides an auxiliary output through the pins TZ(out) 49 and RZ(out) S 1. The auxiliary output, phone (out) connection (2) 43, may be utilized for example, when the WSU 21 (FIG. 2) is connected across a Tip-Ring connection, and the integrity of the wiring from the WSU
21 to the Tip-Ring connection needs to be specifically monitored.
Additionally, an auxiliary output may be implemented to interface the monitoring and reporting device with a premises security alarm system.
If the Telco Tip-Ring interface at T(in) 37 and R(in) 39 is either open circuited or short circuited, the LM 741 comparator 33 applies a positive bias to the transistor 53. This opens the circuit to LED 1 and LED 2, and to phone (out) connection ( 1 ) 41 and phone (out) connection (2) 43. The status at the interface of the premises is reflected on LED 1 and LED 2, which are status ir.Uicators a addition, if an abnormal impedance condition occurs in the premises wiring, such as a short-circuit across out ( 1 ), LED l and LED 2 also indicate the change in status.
Although LED 1 and LED 2 are used in FIG. 3 as indicators, other methods may be employed to report the status of the system. For example, an emitter-follower circuit ' 7 T h A
_ .., ...
~~ .. ..
such as transistor 53 may be utilized to drive digital NAND gates providing a TTL logic output to ,indicate circuit status and also provide an optional direct digital interface into the WSU 21 for wiring status :reporting. Additionally, sound emitters may be used instead of or in addition to LED indicators to provide an audible indication of an abnormal status.
The power source 61 normally provides 12 volt DC power. The DC power could optionally be provided by the WSU 21.
AAAFAUICf~ f~t trr-T
Claims (8)
1. A standalone device (10) for passively monitoring premises telephone wiring and reporting faults in the wiring, said device including a sensor component (33) for measuring a plurality of conditions in the premises telephone wiring, a monitoring circuit (31) connected to the sensor component that utilizes measurements from the sensor component to determine a plurality of alarm conditions, an on-premises reporting component (55 and 57) connected to the monitoring circuit for reporting the plurality of alarm conditions to a subscriber, and a power supply (61) for powering the sensor component, the monitoring circuit, and the reporting component, CHARACTERIZED
in that it comprises:
a sensor component which operates without a connection to a telephone company central office; and a remote reporting component (21) that automatically reports alarm conditions to an external monitoring location in response to receiving the alarm conditions from the monitoring circuit.
in that it comprises:
a sensor component which operates without a connection to a telephone company central office; and a remote reporting component (21) that automatically reports alarm conditions to an external monitoring location in response to receiving the alarm conditions from the monitoring circuit.
2. The monitoring and reporting device of claim 1 further comprising means (43) for integrating the device with a premises security alarm system.
3. The monitoring and reporting device of claim 1 wherein the remote reporting component includes a plurality of digital NAND gates driven by an emitter-follower circuit, said NAND gates, producing a TTL logic output to indicate premises wiring status.
4. The monitoring and reporting device of claim 1 wherein the remote reporting component includes a wireless subscriber unit (21) for communicating alarm conditions by radio to a telephone network.
5. The monitoring and reporting device of claim 1 wherein the remote reporting component includes means for reporting alarm conditions by auto-dialing a telephone number to a telephone company central office.
6. The monitoring and reporting device of claim 1 wherein the sensor component includes means for measuring Tip-Ring voltage, Tip-Ring current, and premises loop impedance.
7. The monitoring and reporting device of claim 1 wherein said plurality of alarm conditions includes:
an open circuit in said premises wiring;
a short circuit in said premises wiring; and invalid loop impedance.
an open circuit in said premises wiring;
a short circuit in said premises wiring; and invalid loop impedance.
8. A standalone device (10) for passively monitoring premises telephone wiring and reporting faults in the wiring, said device including a sensor component (33) for measuring a plurality of conditions in the premises telephone wiring, a monitoring circuit (31) connected to the sensor component that utilizes measurements from the sensor component to determine a plurality of alarm conditions, an on-premises reporting component (55 and 57) connected to the monitoring circuit for reporting the plurality of alarm conditions to a subscriber, and a power supply (61) for powering the sensor component, the monitoring circuit, and the reporting component, CHARACTERIZED
in that it comprises:
a sensor component which operates without a connection to a telephone company central office, and measures Tip-Ring voltage, Tip-Ring current, and premises loop impedance; and a wireless subscriber unit (21) for automatically communicating alarm conditions by radio to an external monitoring location by auto-dialing a telephone number, said wireless subscriber unit communicating in response to receiving the alarm conditions from the monitoring circuit.
in that it comprises:
a sensor component which operates without a connection to a telephone company central office, and measures Tip-Ring voltage, Tip-Ring current, and premises loop impedance; and a wireless subscriber unit (21) for automatically communicating alarm conditions by radio to an external monitoring location by auto-dialing a telephone number, said wireless subscriber unit communicating in response to receiving the alarm conditions from the monitoring circuit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US87192297A | 1997-06-10 | 1997-06-10 | |
| US08/871,922 | 1997-06-10 | ||
| PCT/US1998/011459 WO1998057483A1 (en) | 1997-06-10 | 1998-06-03 | Telephone line monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2278235A1 true CA2278235A1 (en) | 1998-12-17 |
Family
ID=25358451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002278235A Abandoned CA2278235A1 (en) | 1997-06-10 | 1998-06-03 | Telephone line monitoring device |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JP2001508981A (en) |
| CN (1) | CN1250569A (en) |
| AR (1) | AR005214A1 (en) |
| AU (1) | AU7813898A (en) |
| BR (1) | BR9808861A (en) |
| CA (1) | CA2278235A1 (en) |
| CO (1) | CO4780075A1 (en) |
| ES (1) | ES2157176B1 (en) |
| PE (1) | PE100299A1 (en) |
| UY (1) | UY25038A1 (en) |
| WO (1) | WO1998057483A1 (en) |
| ZA (1) | ZA984964B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5879303A (en) | 1996-09-27 | 1999-03-09 | Atl Ultrasound | Ultrasonic diagnostic imaging of response frequency differing from transmit frequency |
| US6283919B1 (en) | 1996-11-26 | 2001-09-04 | Atl Ultrasound | Ultrasonic diagnostic imaging with blended tissue harmonic signals |
| IL152824A (en) * | 2002-11-13 | 2012-05-31 | Mosaid Technologies Inc | Addressable outlet and a network using same |
| DE10334127A1 (en) * | 2003-07-25 | 2005-02-24 | Rohde & Schwarz Gmbh & Co. Kg | Mobile device with remote-controlled reclosing function |
| CN104486513B (en) * | 2014-11-14 | 2017-02-22 | 中国电子科技集团公司第三十研究所 | Device and method for realizing multi-channel SIM card equipment centralized management and maintenance |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4197435A (en) * | 1978-02-24 | 1980-04-08 | Jackson Amos R | Telephone line monitoring circuit and method |
| CA1140690A (en) * | 1978-07-19 | 1983-02-01 | Everhard H.B. Bartelink | Remote supervisory system for monitoring telephone subscriber premises |
| US4446340A (en) * | 1982-04-23 | 1984-05-01 | Calculagraph Company | Customer premises loop test unit powered from the normal central office power source |
| US4817137A (en) * | 1987-11-30 | 1989-03-28 | Yechiel Rosenfeld | Apparatus for remotely determining hook status conditions |
| US4864598A (en) * | 1988-07-20 | 1989-09-05 | Keptel, Inc. | Loop status verification system |
| US4937851A (en) * | 1988-07-20 | 1990-06-26 | Keptel, Inc. | Loop status verification system |
-
1998
- 1998-06-03 JP JP50283899A patent/JP2001508981A/en active Pending
- 1998-06-03 CN CN98803240A patent/CN1250569A/en active Pending
- 1998-06-03 AU AU78138/98A patent/AU7813898A/en not_active Abandoned
- 1998-06-03 ES ES009950039A patent/ES2157176B1/en not_active Expired - Lifetime
- 1998-06-03 BR BR9808861-0A patent/BR9808861A/en not_active IP Right Cessation
- 1998-06-03 WO PCT/US1998/011459 patent/WO1998057483A1/en not_active IP Right Cessation
- 1998-06-03 CA CA002278235A patent/CA2278235A1/en not_active Abandoned
- 1998-06-09 ZA ZA984964A patent/ZA984964B/en unknown
- 1998-06-10 CO CO98033129A patent/CO4780075A1/en unknown
- 1998-06-10 UY UY25038A patent/UY25038A1/en not_active Application Discontinuation
- 1998-06-10 PE PE1998000491A patent/PE100299A1/en not_active Application Discontinuation
- 1998-06-10 AR ARP980102743A patent/AR005214A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| UY25038A1 (en) | 1998-07-10 |
| ZA984964B (en) | 1999-01-11 |
| CO4780075A1 (en) | 1999-05-26 |
| ES2157176B1 (en) | 2002-01-16 |
| WO1998057483A1 (en) | 1998-12-17 |
| AU7813898A (en) | 1998-12-30 |
| AR005214A1 (en) | 1999-04-28 |
| PE100299A1 (en) | 1999-10-15 |
| ES2157176A1 (en) | 2001-08-01 |
| CN1250569A (en) | 2000-04-12 |
| JP2001508981A (en) | 2001-07-03 |
| BR9808861A (en) | 2000-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |