ZyXEL Communications IES-708 Guía de usuario descargar pdf (Pagina 117)

IES-708-22A User’s Guide

117

CHAPTER 14

xDSL Profiles Setup

A profile is a list of settings that you define. Then you can assign them to one or more

individual ports. For background information about many of these settings, see Chapter 13 on

page 103.

14.1 Configured Versus Actual SHDSL Rates

You configure the maximum and minimum rates of individual SHDSL ports using the set

profile command. However, due to noise and other factors on the line, the actual rate may not

reach the maximum that you specify.

Even though you can specify arbitrary numbers in the set profile command, the actual rate is

always a multiple of 64 Kbps. If you enter a rate that is not a multiple of 64 Kbps, the actual

value will be the next lower multiple of 64Kbps. For instance, if you specify 2100 Kbps for a

port, the actual value will be 2048 Kbps, and if you specify 2120 Kbps, the actual value will be

2112 Kbps.

Note that when you configure a DSL profile, the upstream and downstream speeds are the

same. The minimum rate must be less than or equal to the maximum rate.

14.2 N-wire Mode

The n-wire mode allows you to physically bundle two SHDSL ports into a single 4-wire

connection. The 4-wire mode is described in ITU-T G.991.2. You can use it to connect to

SHDSL modems or routers that also support 4-wire mode. N-wire mode also allows you to

physically bundle four SHDSL ports into a single 8-wire connection. The 8-wire group is

called mpair4.

N-wire mode can increase the reach of a particular data rate without having to regenerate the

signal. It can also give increased bandwidth for LAN-to-LAN applications.

When using 4 or 8-wire groups, you must apply the same DSL profile to every port in a

specific set of ports. For example, a profile for a 4-wire group can be used with ports 1,2 or 3,4

but not with ports 2,3 or 4,5. A profile for an 8-wire group can be used with ports 1,2,3,4 or

5,6,7,8 but not with ports 2,3,4,5 or 4,5,6,7.

After you assign the same DSL profile to all the ports in the set, you only have to configure the

one with the highest port number. Its settings apply to all the ports in the set. For example, if

you create an 8-wire group with ports 5, 6, 7, and 8, all the settings for port 8 apply to ports 5,

6, and 7 (regardless of whatever settings might already exist for ports 5, 6, and 7).

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ZyXEL Communications IES-708 Guía de usuario Pagina 117