Direct access test unit for central office

• US 4,841,560 A
• Filed: 10/16/1987
• Issued: 06/20/1989
• Est. Priority Date: 10/16/1987
• Status: Expired due to Fees

• Current Assignee: Harris Corporation Melbourne
• Original Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Inventors: Pierce, Ben, Shafto, Leslie, Chan, Aaron
• Primary Examiner(s): SCHREYER, STAFFORD
• Application Number:
  US07/109,164
• Time in Patent Office: 613 Days
• Field of Search: 379/23, 379/22, 379/26, 379/24, 379/27, 379/29, 379/31
• US Class Current: 379/29.02
• CPC Class Codes: H04M 3/30 for subscriber's lines , for the local loop
• CPC Class Codes: H04M 3/487 Arrangements for providing information services, e.g. recorded voice services or time announcements

Abstract

A direct access test unit for enabling a craftsperson at a telephone facility remote with respect to a central office to test subscriber lines comprises a first access port coupled to an access line circuit, by way of which the remote telephone facility communicates with the telephone office in the course of testing subscriber lines, and a second access port coupled to a test trunk circuit by way of which a subscriber line is to be tested by the test unit. Coupled between the first and second access ports is a processor-controlled subscriber line test/interface arrangement which is responsive to (tone) dial signals, generated by the remote telephone facility, and representative of a command to conduct a test of a selected one of a plurality of subscriber line circuits that are accessible by the test unit from the second access port, including the line circuit to which said remote telephone facility is connected, for accessing the subscriber line circuit via the second access port and conducting tests of the subscriber line circuit by way of the test trunk circuit. Stored within the memory of the processor which controls the operation of the test unit are voice message menus, each in a respectively different language (e.g. English, Spanish) the contents of which are controllably accessed and synthesized for transmission to the craftsperson via the first access port. The voice messages include instructions for guiding the craftsperson in the course of carrying out a test of a selected subscriber line.

Claims

1. A direct access test unit to be connected in a telephone office for testing subscriber lines in response to commands from a remote telephone facility comprising:

a first access port coupled to an access line circuit by way of which said remote telephone facility communicates with said telephone office in the course of testing subscriber lines;

a second access port, coupled to a test trunk circuit, by way of which a subscriber line is placed in a prescribed electrical test condition by said test unit in accordance with a prescribed test to be conducted on said subscriber line circuit; and

subscriber line test means, coupled to said first and second access ports, and responsive to a command supplied from said remote telephone facility via said access line circuit to said first access port, representative of a command to conduct a test of the subscriber line circuit to which said remote telephone facility is connected, for placing said subscriber line circuit in a prescribed electrical test condition via said second access port in accordance with a prescribed test of said subscriber line circuit.

2. A direct access test unit according to claim 1, wherein said subscriber line test means comprises means, for supplying selected voice messages, through said first access port over said access line circuit to said remote telephone facility, in a language prescribed in accordance with a command generated by said remote telephone facility.

3. A direct access test unit according to claim 1, wherein said subscriber line test means comprises means for accessing a subscriber line circuit via said second access port and placing said subscriber line in a prescribed electrical test condition circuit at a prescribed period of time independent of the receipt of command signals from said remote telephone facility.

4. A direct access test unit according to claim 1, wherein said test unit comprises means, coupled to said access line circuit, for monitoring said access line circuit for the presence of a line seizure condition and causing a line circuit loop termination to be coupled to said access line circuit in response to detecting said line seizure condition, and means, responsive to either a termination of said line seizure condition or a line circuit disconnect command from said remote telephone facility, for disconnecting said test unit from said subscriber line circuit.

5. A direct access test unit according to claim 1, wherein said test unit includes audio monitor means, coupled between access said line circuit and said test trunk circuit, for coupling audio signals produced by a subscriber line circuit and supplied to said second access port, to said first access port, and means, responsive to a command from said remote telephone facility, for causing a busy test termination to be placed across said second access port, and causing said audio monitor means to couple audio signals, applied to said second access port by a subscriber line circuit coupled thereto, to said first access port, so as to be monitored by said remote telephone facility via said access line circuit.

6. A direct access test unit according to claim 5, wherein said telephone office contains a permanent signal release circuit coupled to said second access port, and means, responsive to a command from said remote telephone facility, for activating said permanent signal release circuit, so as to release said subscriber line circuit monitored by said remote telephone facility by way of said audio monitor means.

7. A direct access test unit according to claim 2, wherein said subscriber line test means comprises means for accessing a subscriber line circuit via said second access port and placing said subscriber line circuit in a prescribed electrical test condition at a prescribed period in time independent of the receipt of command signals from said remote telephone facility.

8. A direct access test unit according to claim 7, wherein said test unit comprises means, coupled to said access line circuit, for monitoring said access line circuit for the presence of a line seizure condition and causing a line circuit loop termination to be coupled to said access line circuit in response to detecting said line seizure condition, and means, responsive to either a termination of said line seizure condition or a line circuit disconnect command from said remote telephone facility, for disconnecting said test unit from said subscriber line circuit.

9. A direct access test unit according to claim 8, wherein said test unit includes audio monitor means, coupled between said access line circuit and said test trunk circuit, for coupling audio signals produced by a subscriber line circuit and supplied to said second access port, to said first access port, and means, responsive to a command from said remote telephone facility, for causing a busy test termination to be placed across said second access port, and causing said audio monitor means to couple audio signals, applied to said second access port by a subscriber line circuit coupled thereto, to said first access port, so as to be monitored by said remote telephone facility via said access line circuit.

10. A direct access test unit according to claim 9, wherein said telephone office contains a permanent signal release circuit coupled to said second access port, and means, responsive to a command from said remote telephone facility, for activating said permanent signal release circuit, so as to release said subscriber line circuit monitored by said remote telephone facility by way of said audio monitor means.

11. A direct access unit according to claim 1, further including means, coupled to said second access port, for coupling said direct access test unit to a serial digital data link.

12. A direct access test unit to be connected in a telephone office for testing subscriber lines in response to commands from a remote telephone facility comprising:

a first access port coupled to an access line circuit by way of which said remote telephone facility communicates with said telephone office in the course of testing subscriber lines;

a second access port coupled to a test trunk circuit by way of which a subscriber line is placed in a prescribed electrical test condition by said test unit in accordance with a prescribed test to be conducted on said subscriber line circuit; and

subscriber line test means, coupled to said first and second access ports and responsive to a command supplied from said remote telephone facility via said access line circuit to said first access port, representative of a command to conduct a test of a selected one of a plurality of subscriber line circuits that are accessible by said test unit from said second access port, including the line circuit to which said remote telephone facility is connected, for placing said subscriber line circuit in a prescribed electrical test condition via said second access port in accordance with a prescribed.

13. A direct access test unit according to claim 12, wherein said subscriber line test means comprises means, for supplying selected voice messages, through said first access port over said access line circuit to said remote telephone facility, in a language prescribed in accordance with a command generated by said remote telephone facility.

14. A direct access test unit according to claim 13, wherein said voice messages include instructions for initiating the placing a selected subscriber line circuit in a prescribed electrical test condition via said second access port.

15. A direct access test unit according to claim 12, wherein said subscriber line test means comprises means for accessing a subscriber line circuit via said second access port and placing said subscriber line circuit in a prescribed electrical test condition at a prescribed period in time independent of the receipt of command signals from said remote telephone facility. access port.

16. A direct access test unit according to claim 12, wherein said test unit comprises means, coupled to said access line circuit, for monitoring said access line circuit for the presence of a line seizure condition and causing a line circuit loop termination to be coupled to said access line circuit in response to detecting said line seizure condition, and means, responsive to either a termination of said line seizure condition or a line circuit disconnect command from said remote telephone facility, for disconnecting said test unit from said subscriber line circuit.

17. A direct access test unit according to claim 12, wherein said test unit includes audio monitor means, coupled between said access line circuit and said test trunk circuit, for coupling audio signals produced by a subscriber line circuit and supplied to said second access port, to said first access port, and means, responsive to a command from said remote telephone facility, for causing a busy test termination to be placed across said second access port, and causing said audio monitor means to couple audio signals, applied to said second access port by a subscriber line circuit coupled thereto, to said first access port, so as to be monitored by said remote telephone facility via said access line circuit.

18. A direct access test unit according to claim 17, wherein said telephone office contains a permanent signal release circuit coupled to said second access port, and means, responsive to a command from said remote telephone facility, for activating said permanent signal release circuit, so as to release said subscriber line circuit monitored by said remote telephone facility by way of said audio monitor means.

19. A direct access test unit according to claim 12, wherein said subscriber line test means comprises processor-controlled test circuit means, connected to said second access port, for placing said selected subscriber line circuit in selected electricl test conditions in response to commands received from said remote telephone facility via said access line circuit and said first access port.

20. A direct access test unit according to claim 19, wherein said voice message include information relating to the status of tests conducted by said processor-controlled test circuit means.

21. A direct access test unit according to claim 12, wherein said voice message include information relating to the status of tests conducted by said processor-controlled test circuit means.

22. A direct access test unit according to claim 21, wherein said test circuit means includes means, responsive to a processor-generated control signal, for placing a short circuit across tip and ring terminals of said second access port.

23. A direct access test unit according to claim 21, wherein said test circuit means includes means, responsive to a processor-generated control signal, for applying a test tone signal across tip and ring terminals of said second access port.

24. A direct access test unit according to claim 23, wherein said test tone signal is a selected one of a high or low tone signal.

25. A direct access test unit according to claim 21, wherein said test circuit means includes means, responsive to a processor-generated control signal, for applying an open circuit condition from said second access port to said selected subscriber line circuit.

26. A direct access test unit according to claim 21, wherein said test circuit means includes means, responsive to a processor-generated control signal, for controlling the state of a sleeve terminal of said second access port.

27. A direct access test unit according to claim 19, wherein said subscriber line test means includes decoder means for decoding dialing signals representing at least one digit from said remote telephone facility for controlling said subscriber line test means to effect a selected electrical test condition designated by said dialing signals on said selected subscriber line circuit.

28. A direct access test unit according to claim 21, wherein said test circuit means includes means, connected to tip and ring terminals of said second access port, for detecting a busy condition in a subscriber line circuit connected to said second access port via said test trunk and audio monitor means for controllably coupling audio signals received from said second access port to said first access port for application to said remote telephone facility to be monitored thereby when said selected subscriber line circuit is busy.

29. A direct access test unit according to claim 28, wherein said audio monitor means includes means for scrambling said audio monitor signals so as to render them unintelligible at said remote telephone facility.

30. A direct access unit according to claim 12, further including means, coupled to said second access port, for coupling said direct access test unit to a serial digital data link.