How to properly connect an ADSL splitter. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Telephony

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The screenshots are taken from the documentation for ZyXEL, HUAWEI, D-Link ADSL modems, etc. Let's consider the connection option using the ZyXEL AS 6 EE splitter as an example.

Connecting an ADSL splitter. The most common option

1. Connect the city telephone line to the LINE connector of the splitter. Sometimes this connector is called LINE-IN, for example ECI-TELECOM splitters. Haven't seen any other options. Branches or branches are undesirable. This significantly reduces the reliability of the ADSL modem. If there are taps/branchings before the splitter, then telephone sets must be switched on through "microfilters". Instead of a microfilter, you can use another ADSL splitter.

2. Connect an ADSL modem to the MODEM connector of the splitter. In ECI-TELECOM splitters this connector is sometimes called LINE-OUT, in D-Link splitters this connector is called ADSL. SIEMENS calls it NT. (Network Termination)

3. Phones, faxes, PBXs, Dial-UP modems, etc. are connected to the PHONE connector of the splitter. Everything that used to hang on this phone number will now be included in the splitter, in the PHONE connector! Sometimes this connector is called TEL, - D-Link splitters, microfilters, ISDN splitters. For SIEMENS splitters, this connector is called POTS (Plain Old Telephone Service)

ADSL splitter ZyXEL AS 6 EE

The general option for connecting the ZyXEL AS 6 EE ADSL splitter, for example, the ZyXEL 660H modem is taken

How to connect an ADSL splitter

We use the highest quality telephone wire. Power wires must not be used. It is desirable to completely get rid of the TRP cable ("noodles under the carnation"). Indoors, the distance from the ADSL splitter to the ADSL modem can be any. But the total distance between your ADSL modem and the provider modem (DSLAM) installed on the PBX should not exceed the theoretical 5-6 km. (Cable Length) The best option is to run a CAT 5 twisted-pair cable from the stairwell KRT to the splitter and from the splitter to the ADSL modem. For example:

UTP twisted pair cable, category 5, 2 pairs, solid UTP2-C5E-SOLID-GY

The two-pair cable is ideal for RJ11 termination. For the line, we take a blue or orange pair. It is forbidden to take wires from different pairs!

The splitters use RJ11 connectors, but the old ECI-TELECOM models and ZyXEL ISDN splitters have replaced the MODEM connector with RJ45. All splitter connectors use two center pins.

Possible options for connecting an ADSL splitter

Cascading connection.

Such a connection is not possible with SIEMENS splitters, their NT / ADSL output is decoupled by capacitors. The direct current for the phone connected to the second splitter will not pass.

(click to enlarge)

Cascading connection

The connection scheme using microfilters is used in hopeless situations when it is impossible to change the telephone wiring in the room. This is a last resort and is not recommended. Sometimes, in order to save money, the microfilter / splitter is not used at all. As a result, the phone interferes with the operation of the ADSL modem (frequent loss of connection). There is noise in the phone when the ADSL modem is working. Instead of a microfilter, you can use another ADSL splitter. At the same time, the MODEM connector is not used for the second splitter. Connect the remaining two connectors as shown in the figure below:

Use of microfilters

In general, if you look at the contract with the telephone operator, then in it, in the contract, it says - "one telephone line - one telephone set." If you have an office, then connect the line to a mini-PBX. If you have an apartment and you desperately need a telephone in every room, then connect the line to the DECT base, and then the radio handsets to each room. Of course, one or two phones connected via a splitter do not heavily load the line, but five or more devices are already too much.

By connecting all these endless splitters, microfilters, telephones to the line, you increase the capacitive load on the line. Thus, you yourself worsen the quality of telephony. A situation may even arise that, due to an excessively increased capacitance, the ringing signal will no longer pass through the line. Also, the more connections, connectors, contacts, the less reliability.

How not to connect an ADSL splitter

The most common mistake is when phones are connected to a splitter.

Another option is to turn on the splitter somewhere, turn on the ADSL modem somewhere. Telephones will be connected wherever possible. It is clear that all this "somehow" works.

Sometimes a telephone line is connected to the PHONE splitter connector. Telephone sets are connected to the LINE splitter connector. With this inclusion, telephone sets will work, ADSL modem will not work.

The strangest thing is that modem manufacturers draw in the documentation the wrong location of the connectors when connecting a splitter. The modem is drawn in all details, but for some reason the splitter is drawn somehow. Learn it.

Publication: cxem.net

See other articles Section Telephony.

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