Bedienungsanleitung ZyXEL VMG8825-Bx0B (Seite 141 von 434) (Englisch)

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Chapter 6 Broadband

VMG/XMG Series User’s Guide

141

6.5 Ethernet WAN

Use this screen to have the fourth LAN port act as an Ethernet WAN port. You can restore it back from a

WAN port to a LAN port. Click the switch to set up the configuration. When the switch goes to the right,

SRA Enable or disable Seamless Rate Adaption (SRA). Select Enable to have the Zyxel Device

automatically adjust the connection’s data rate according to line conditions without

interrupting service.

DSL Modulation

PTM over ADSL : Select Enable to use PTM over ADSL. Since PTM has less overhead than ATM, some ISPs use this for

better performance.

G.Dmt : ITU G.992.1 (better known as G.dmt) is an ITU standard for ADSL using discrete multitone

modulation. G.dmt full-rate ADSL expands the usable bandwidth of existing copper telephone

lines, delivering high-speed data communications at rates up to 8 Mbit/s downstream and 1.3

Mbit/s upstream.

G.lite : ITU G.992.2 (better known as G.lite) is an ITU standard for ADSL using discrete multitone

modulation. G.lite does not strictly require the use of DSL filters, but like all variants of ADSL

generally functions better with splitters.

T1.413 : ANSI T1.413 is a technical standard that defines the requirements for the single asymmetric

digital subscriber line (ADSL) for the interface between the telecommunications network and

the customer installation in terms of their interaction and electrical characteristics.

ADSL2 : It optionally extends the capability of basic ADSL in data rates to 12 Mbit/s downstream and,

depending on Annex version, up to 3.5 Mbit/s upstream (with a mandatory capability of ADSL2

transceivers of 8 Mbit/s downstream and 800 kbit/s upstream).

Annex L : Annex L is an optional specification in the ITU-T ADSL2 recommendation G.992.3 titled Specific

requirements for a Reach Extended ADSL2 (READSL2) system operating in the frequency band

above POTS, therefore it is often referred to as Reach Extended ADSL2 or READSL2.The main

difference between this specification and commonly deployed Annex A is the maximum

distance that can be used. The power of the lower frequencies used for transmitting data is

boosted up to increase the reach of this signal up to 7 kilometers (23,000 ft).

ADSL2+ : ADSL2+ extends the capability of basic ADSL by doubling the number of downstream channels.

The data rates can be as high as 24 Mbit/s downstream and up to 1.4 Mbit/s upstream

depending on the distance from the DSLAM to the customer's premises.

Annex M : Annex M is an optional specification in ITU-T recommendations G.992.3 (ADSL2) and G.992.5

(ADSL2+), also referred to as ADSL2 M and ADSL2+ M. This specification extends the capability of

commonly deployed Annex A by more than doubling the number of upstream bits. The data

rates can be as high as 12 or 24 Mbit/s downstream and 3 Mbit/s upstream depending on the

distance from the DSLAM to the customer's premises.

VDSL2 VDSL2 (Very High Speed Digital Subscriber Line 2) is the second generation of the VDSL standard

(which is currently denoted VDSL1). VDSL2 allows a frequency band of up to 30MHz and

transmission rates of up to 100 Mbps in each direction. VDSL2 is defined in G.993.2.

VDSL Profile VDSL2 profiles differ in the width of the frequency band used to transmit the broadband signal.

Profiles that use a wider frequency band can deliver higher maximum speeds.

8a, 8b, 8c, 8d,

12a, 12b, 17a,

30a, 35b US0

The G.993.2 VDSL standard defines a wide range of profiles that can be used in different VDSL

deployment settings, such as in a central office, a street cabinet or a building.

The Zyxel Device must comply with at least one profile specified in G.993.2. but compliance with

more than one profile is allowed.

Cancel Click Cancel to return to the previous configuration.

Apply Click Apply to save your changes back to the Zyxel Device.

Table 36 Network Setting > Broadband > Advanced (continued)

LABEL DESCRIPTION

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