Method of synchronizing LEDS between a digital telephone and remote options
US5339360A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1992 |
| Grant date | Aug 16, 1994 |
| Priority date | — |
| Expiry date | Oct 30, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2201/38
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system and method of synchronizing visual indicators in digital telephone including at least one attached auxiliary device. Visual indicators on the base telephone and the auxiliary device are first set to an initial state. Later, as various telephony features are activated, corresponding ones of the visual indicators on the base telephone and the auxiliary device are operated at predetermined cadences. When the cadence control mechanism (and thus the visual indicators) of the base telephone reaches a predetermined state, a state machine in the base telephone sends a synchronization message to the auxiliary device and then continues to operate the visual indicators on the base telephone at their predetermined respective cadences. Upon receipt of the synchronization message, the auxiliary device sets its cadence control mechanism to the predetermined state, thus synchronizing them with their like cadence counterparts in the base digital telephone. The auxiliary device then continues to operate its visual indicators at their predetermined respective cadences.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.