http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-8602795-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0b90c31b8e406de6f22579dd6ab5e32a |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04M19-026 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04M3-22 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04M7-0096 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04Q1-38 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H04M3-2272 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04M3-22 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04Q1-38 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04M19-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04M7-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04Q3-42 |
| filingDate | 1985-10-11^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_01a137c399805e387d95fea4d94796ad |
| publicationDate | 1986-05-09^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | WO-8602795-A1 |
| titleOfInvention | Interswitch line circuit |
| abstract | Interface circuits between PABX's or central office line circuits and telephone sets. The prior-art use of separate detectors for ringing signal detection, forward loop current detection, and reverse loop current detection, results in high costs when per line expense is multiplied by the number of lines used by a customer. The invention has one detector for detecting forward and reverse loop current, and the presence of a ringing signal. A sense circuit (22) is connected to a central office or PABX through an isolation transformer's winding (16) for detection of ringing or loop current direction in response to a control signal (VC) supplied from pulse recognition hardware (26). In one embodiment (Fig. 4), forward or reverse battery states may be detected when off-hook. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4899379-A |
| priorityDate | 1984-10-29^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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