Tehnologija povezivanje interneta preko upredenog kabl-a.

[Vasilije004]

Dragi članovi foruma,
trebala bi mi vaša stručna pomoć oko pojma povezivanja interneta preko upredenog kabla. Na žalost nijesam uspio da se snađem i informišem na netu, zato i otvaram ovu temu.

Svi znamo da se internet može povezati preko upredenog kabla, gdje se koriste samo 4 parice 1,2 za "upstream" i 3 i 6 za "downstream". To sam testirao više puta ali mi sad nije jasno, ako izostavim parice 4,5,7 i 8 koje se ne koriste, ne mogu da izvučem neku malo veću brzinu. U drugom slučaju kad sve parice stavim na konektor RJ45 prikazuje mi pravu brzinu od provajdera.

U nadi da ćete pomoći da otkrijemo za mene ovu misteriju !

Srdačno vas pozdravljam!

[Luka Filipovic]

Za gigabitni ethernet se koriste sve 4 parice.

Since negotiation takes place on only two pairs, if two gigabit devices are connected through a cable with only two pairs, the devices will successfully choose 'gigabit' as the highest common denominator (HCD), but the link will never come up. Most gigabit physical devices have a specific register to diagnose this behavior. Some drivers offer an "Ethernet@Wirespeed" option where this situation leads to a slower yet functional connection.[7]

The data is transmitted over four copper pairs, eight bits at a time. First, eight bits of data are expanded into four three-bit symbols through a non-trivial scrambling procedure based on a linear feedback shift register; this is similar to what is done in 100BASE-T2, but uses different parameters. The three-bit symbols are then mapped to voltage levels which vary continuously during transmission.

https://en.m.wikipedia.org/wiki/Gigabit_Ethernet