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Splitter o Filtro ADSL differenze e quale usare.

data filters that are included with the modem or sold in the malls or shops in the area are incorrectly defined splitter, they are actually filters.
The real difference between a filter and a splitter is to cut as the two frequencies (voice - Data -> Upload / Download), to know the frequencies involved here go .

The splitter filter makes a difference to cut more precisely and therefore in theory should provide a better connection, especially where there are contascatti, fax, etc. .., in fact, the tests carried out on different lines with different modem and more various combinations were unsuccessful striking, indeed in some cases have worsened the situation.
The components of a splitter is more complex so expensive (even if the price difference is so sensitive is not justified), but in some cases is worth groped, especially when disorders and the usual problems.
Installed upstream of the line splitter allows you to avoid having to put a filter to each unit and of course the voice and data lines are separate, so if you want a phone around to each PC you will need to pull more wires, I remind you to use twisted wires pair and flat extensions that are given decoder supplied with blinds or other appliances or extension cords.

filters though inferior in most cases are more than enough to ensure a good service, even if they are not all equal and we want one for each connected device.

Being very curious I have removed many and some are very poor and badly designed, telecom filters like in the picture are not as bad Carry out a good cut (measured). The splitter
most famous are the 'Alcatel 1000 ADSL LP Splitter (hard to find) and the cheapest SAP001 HR.

are many schools of thought, the diehards argue that the less stringent are essential Splitter tend to actually post where used because these devices are indispensable.

In my opinion the only way to be sure that the use of a splitter will benefit you try! So

before investing money on a splitter to try a friend or acquaintance, you can invest the money they save on the system trying to make it as efficient as possible.

More information about the cuts and the frequencies you will find them here

If you want to try the path of an ADSL filter dell'autocostruzione good guide you will find it here . ;

Due to numerous requests splitters HR compatible pointing you in Italy ( models by country):

SAP 001 POTS/600/4KHz ADSL Splitter ADSL Splitter 001.ST

SAP SAP POTS/600/4KHz/ST

020 ADSL Splitter POTS/600/16kHz This seems to fit where they are present on the line contascatti old.

At the site you can buy at very low prices, even compared to eBay and buy yourself write off the cost of shipping also compatible filters for Italy:

MFAS001 MFAD001 and only output x phone, telephone and MFAT001 modem, MFAA001 x alarms.

There are also filters for or VHDSL VDSL (Very High Digital Subscriber Line) presente in Slovenia,Svizzera, Giappone e Corea del Sud.

Specifiche:
Scheda Filtro per linee VDSL2
Splitter Bandwidth DC to 4KHz Nominal Voice Band 0.3KHz to 3.4KHz Ringing Frequency 15.3Hz to 68Hz DSL Band 32KHz to 30MHz Line Impedance 300Hz to 3.4KHz 600ohms Modem Impedance 32KHz to 30MHz 100ohms. Nominal Signal 21mVpp to 5.4Vpp Ringing Signal 40Vrms to 150Vrms DC Voltage 0V to 105V Max AC Voltage 150Vrms. Loop Current <100mA. DC Resistance DC Resistance Tip to Tip and Ring to Ring <25ohms Isolation Resistance Tip to Ring >5Mohms Capacitance Tip to Ring >20nF and <115nF Voice Band Characteristics Insertion loss at 1004Hz Co and remote end for short loop <1.0dB Insertion loss at 1004Hz Co and remote end for long loop <0.75dB Insertion Loss Distortion 200 to 3.4KHz Return Loss 300Hz to 500Hz >14dB 500Hz to 2000Hz >18dB 2000Hz to 3400Hz >14dB Delay Distortion 200 to 4KHz 250uS Longitudinal Conversion Loss(LCL) 200Hz to 3.2KHz >52dB xDSL Band Characteristics xDSL Band Attenuation 32K to 300KHz >65dB xDSL Band Attenuation 300K to 30MHz >55dB

Quindi capirete da soli che si tratta di un  filtro specifico e non compatibile con la tecnologia ADSL

In Italia dal 2008 la denominazione per questa tecnologia si chiama Alice Phibra ma le zone coperte sono poche e coprono principalmente large cities because of high costs.

New unified telephone jack with and without filter for ADSL / VDSL

Official Website Link HR