Apparatus for remote signalling on a digital transmission link
US4727540A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1985 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Nov 27, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B17/40
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Apparatus for implementing a remote signalling method which consists in momentarily replacing the transmitted digital data stream by a remote signalling message which is built up from not more than n identical and nonconsecutive sequences of N bits, with the first sequence of each message being present on each occasion that a message is sent, and with the remaining n-1 sequences of each message representing, by their presence or absence, the values 0 or 1 of n-1 digits in a binary number encoding remote signalling data. FIG. 2 shows a circuit for transmitting a remote signalling message from an equipment along a very high data rate digital link, which equipment is provided with a circuit (6') for detecting and handling alarms, and a circuit (3) for recovering the bit rate from the digital stream. An OR gate (12) associated with dividers (10, 11) implemented in a high speed ECL technology generates a repetitive 1000 pattern on which a sequence is based, and switching device (13) also implemented in high speed ECL technology serves to insert sequences of said pattern into the digital stream to constitute a remote signalling message. The switching device is controlled by message-build…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.