Cutting plug of NMEA and re-joining?

[bruceb58]

Re: Cutting plug of NMEA and re-joining?

When I worked for a defense engineering company, we had a course taught by our GPS guru. Our company designed and used in house designed GPS receivers. If you actually understood how GPS works from a design and engineering aspect, you would realize that this isn't an issue.

 

[bruceb58]

Re: Cutting plug of NMEA and re-joining?

Take a computer and a broadband modem and connect them via cat5 Ethernet cable. Someplace along the cable cut it, and then splice all 8 wires back together the best you can. You will still get somewhat of a connection to the modem. But your going to get all sorts of packet loss, all sorts of connection errors along the way. And your speed is going to be closer to dial up than it is to DSL, and not even close to the broadband it should be.

You would actually be surprised how well it works with a splice. Done it many times. Just look at how an ethernet jack is connected and you will see why. NEMA 2000 is around 500 times slower than even a home ethernet routers line.

 

[jhebert]

Re: Cutting plug of NMEA and re-joining?

...you should never cut and splice... network cables.

You should lend your advice to the telephone companies. They are delivering 10-MB/sec home internet on un-shielded twisted pairs that were installed 50-years ago, which often have un-terminated open stubs, and are cross-connected in neighborhood cabinets and central office frames by un-shielded twisted pair jumpers.

The cable that is being discussed here is a NMEA-2000 network drop cable. The NMEA specification allows for it to be connected to the backbone in junction boxes with terminals lugs--no connectors at all. It is only running at 0.25-MB/sec.

If you want to run 1-GB Ethernet, that is another story. It takes four pairs and careful attention to discontinuities. But NMEA-2000 is much slower and much less critical.