Control circuit for causing cyclic application of sealing...

Details Control circuit for causing cyclic application of sealing... Control circuit for causing cyclic application of sealing...

2011-08-02

2011-08-02

Sing, Simon (Department: 2614)

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

C379S022000, C379S026020

Reexamination Certificate

active

07991123

ABSTRACT:
A system for causing application of sealing current to one or more local telephony loops has a current source; a switching interface for connecting the current source to the one or more telephony loop interfaces; and a machine-readable instruction accessible to the switching interface, the instruction providing intelligence to the switching interface for identifying the one or more loops to be serviced, the time period for current application to each loop serviced, and a sequence order when more than one loop is serviced.

REFERENCES:
patent: 5661778 (1997-08-01), Hall et al.
patent: 6351533 (2002-02-01), Parrott
patent: 6532277 (2003-03-01), Ulanskas et al.
patent: 6754309 (2004-06-01), Nakagawa et al.
patent: 7508814 (2009-03-01), Barzegar et al.
patent: 7773744 (2010-08-01), Joffe
patent: 03250962 (1991-11-01), None
patent: 0072623 (2000-11-01), None

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