Telecommunications multiplexer
US5991312A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1997 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Nov 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/22
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A multiplexer device for multiplexing and demultiplexing signals between a low-speed network including 28 DSX-1 signals and a relatively higher speed network including a DS-3 signal. The multiplexer device includes 7 quad DSX-1 cards and 1 spare card. The spare card is connected to the other 7 DSX-1 cards in a fashion that allows the spare card to automatically be switched in for one of the DSX-1 cards or to allow interface electronics on the spare card to replace selected ones of the interface electronics on various different DSX-1 cards simultaneously. A pair of controller cards, a primary card and a secondary card, perform the M1-3 multiplexing and demultiplexing and the DS-3 framing and transceiving. The controller cards can be selected or deselected by distributed logic in a sufficiently short time period so that alarms are not set off and so that the transition is hitless. This is accomplished by electronically enabling and disabling the transceiver. The multiplexer device is connectable to 2 different T-3 links to provide network redundancy. An array of relays provides for the connection of either controller card to either of the T-3 links. The controller cards are externall…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.