max dolžina UTP/FTP kabla - ne teorija, ampak praksa

kakšen je pa ftp kabel?

Čas čakanja - če si s tem mislil na ping, je le ta isti, seveda pa lahko prihaja do večin ping time-outov zaradi daljšega kabla.
Če se s FTP kablom mislil na stari koaksialen kabel z BNC konektorji (saj mislim da se jim tako reče) - tisti na 10Mbps mrežnih karticah. Teli kabli se pomoje lahko vlečejo na daljše razdalje.

Prakse pa ne poznam. Moja gre samo do 20 metrov.

DSmidgy: FTP je isti kot UTP, samo da ima neko "folijo" ovito okoli 8 žil, .. kao za motnje ?
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a je že ko vleku daljšo povezavo od 100 m ?
kok ste najdlje za koaksialnega - kok se še splača ?

Thin Ethernet ( COAX) tukaj, 185m, 30 priključkov oziroma UTP tukaj ali :

Comparsion between 4 different types of cables

1. UTP (Unshielded Twisted Pair)
- No physical shield but use balancing and filtering techniques through media filters .
- Light, thin and flexible
- Reliable and inexpensive
- Simple to install
- UTP do not have problem of grounding practice and need for properly shield connector and foil shield

2. STP (Shielded Twisted Pair )
- Effective only at preventing radiation or blocking interference as long the entire end to end link is shielded and properly grounded.
- Every component of a shielded cabling system must fully shield
- Heavier, thicker and hard to install
- Must confirm with strict shielding condition hence higher potential of degradation of emission

Note:! STP does not guarantee improve immunity to EMI. Conditions have to be met:
- Shield must be electrically continuous along the whole link
- All component in the link must be shielded. No UTP patch cord can be used.
- Shield must fully enclose the pair and the overall shield must fully enclose the core. Any gap will cause EMI leakage.
- Shield must be grounded at both ends of the link, and the building grounding system must conform to grounding standards (TIA/EIA -607)

3. FTP(Foil twisted pair )
- Also known as screened twisted pair (ScTP)
- Combination UTP and STP
- Basically is a 4 pair 100ohm UTP with a single foil surrounding all four pair
- May be used in Ethernet application same as UTP
- Strict Conditions for shielding

4. Coaxial Cable
- Use for widely for TV Industry
- Used in 10Base5 and 10 Base2
- Difficult to run and is generally more expensive then twisted pair cable.

Choosing the correct cable

UTP
- best choice for office environment (less EMI)

STP/FTP
- Hospital, airports and communication center.
- Extra shield needed for EMI interference
- External field strength exceed 3 volts/m

Coaxial Cables
- Use for widely for TV Industry

LP

NE z utp-jem neboš šel čez 100m.
Na lokaciji imamo STP kable, meritve narejene s flukom za 5Msit, vse pass. Ko smo hoteli naresrti malenkost daljšo povezavo s prevezavami preko routerja , pa so bili packet losi. S tem da je bila povezava le 10Mps in ne 1Gbps.

75 ohmski kabel je za tv in satelitsko... pa tudi debelejši je od 50-ohmskega in verjetno ne bo pasal na bnc konektor.

UTP 5e kabel dolžine 120 metrov pri nas dela normalno. Povezan sem s sosedom. Čekni mojo spletno stran http://users.volja.net/bojanpas