ZyXEL Communications Prestige 642M series Podręcznik Użytkownika Pobierz pdf (Strona 110)

Prestige 642 ADSL Internet Access Router

2-3

Hardware Installation & Setup

Flow Control set to None

After the Prestige has been successfully connected to your network, you can make future changes to the

configuration via telnet.

2.4 Connecting the POTS Splitter

This is for P642’s following the Full Rate (G.dmt) standard only. One major difference between ADSL and

dial-up modems is the need for a telephone splitter. This device keeps the telephone and ADSL signals

separated, giving it the capability to provide simultaneous Internet access and telephone service on the same

line. Splitters also eliminate the destructive interference conditions caused by telephone sets. The telephone

splitter has to be installed on the line at the point of entry to the residence.

Noise generated from a telephone in the same frequency range as the ADSL signal can be disruptive to the

ADSL signal. In addition the impedance of a telephone when off-hook may be so low that it essentially

shunts the strength of the ADSL signal. When a POTS splitter is installed at the entry point where the line

comes into the home, it will filter the telephone signals before combining the ADSL and telephone signals

transmitted and received. The issues of noise and impedance are eliminated with a single POTS splitter

installation.

The following user-friendly telephone splitter can be installed as shown in the following figure.

Figure 2-3 Connecting a POTS Splitter

Step 1.

Connect the side labeled “Phone” to your telephone.

Step 2.

Connect the side labeled “Modem” to your Prestige.

Step 3.

Connect the side labeled “Line” to the telephone wall jack.

2.5 Telephone Microfilters

Telephone voice transmissions take place in the lower frequency range, 0 - 4KHz, while ADSL

transmissions take place in the higher bandwidth range, above 4KHz. ZyXEL provides a microfilter that

acts as a low-pass filter for your telephone to ensure that ADSL transmissions do not interfere with your

telephone voice transmissions.

Wall

Jack

Prestige

ode

Lin

POTS Splitter

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ZyXEL Communications Prestige 642M series Podręcznik Użytkownika Strona 110