Zašto slični uređaji upotrebljavaju kabele prekogranične razmjene umjesto izravnih uređaja?

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Zašto slični uređaji upotrebljavaju kabele prekogranične razmjene umjesto izravnih uređaja?
Zašto slični uređaji upotrebljavaju kabele prekogranične razmjene umjesto izravnih uređaja?
Anonim
Kada povezujete slične uređaje jedni s drugima, možda se pitate zašto se koristi jedna specifična vrsta kabela, a ne druga. Imajući to na umu, današnji SuperUser Q & A post ima odgovor na pitanje čudnog čitatelja.
Kada povezujete slične uređaje jedni s drugima, možda se pitate zašto se koristi jedna specifična vrsta kabela, a ne druga. Imajući to na umu, današnji SuperUser Q & A post ima odgovor na pitanje čudnog čitatelja.

Današnja pitanja i odgovori nam se javljaju zahvaljujući SuperUseru - podjele Stack Exchange-a, zajednice-driven grupiranja Q & A web stranica.

Fotografija ljubaznošću Dom Pates (Flickr).

Pitanje

Čitač SuperUser user576476 želi znati zašto slični uređaji upotrebljavaju cross-over kabele umjesto izravnih prozora:

Why do similar devices use a cross-over cable instead of a straight-through cable?

Zašto slični uređaji koriste umrežene kabele umjesto izravnih uređaja?

Odgovor

SuperUser suradnik Eric F ima odgovor za nas:

Definition of a Cross-Over Cable

A cross-over cable is typically used between devices with the same type of interface (i.e. computer to computer, router to router). Ethernet cables are usually made as an A or B-type interface (which simply means how it is wired).

A cross-over cable simply has an A-type on one end and a B-type on the other end.
A cross-over cable simply has an A-type on one end and a B-type on the other end.
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What is Happening

Basically, what is happening is that the “send” and “receive” are switched so that one of the devices “send” wires goes to the other device’s “receive” wire, and visa versa with the other wire. In reality, the wires are in pairs, so there are two wires for send and two wires for receive.

If you were to use a straight-through cable (where the wires are all-in-line), then a “send” would be going to a “send” and a “receive” to a “receive”, so the devices would not be able to communicate.

Auto MDI-X

Keep in mind that many modern devices use Auto MDI-X, which is a way for a device to automatically switch the wiring method on its own. If either device on the two ends of the Ethernet cable have Auto MDI-X, then it does not matter if you use a cross-over or straight-through cable. Auto MDI-X was introduced in Gigabit Ethernet, so if either of your devices uses Gigabit, such as routers or computers, it has an extremely high chance of having Auto MDI-X already on it.

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