ZyXEL Communications IES4005M, Руководство пользователя

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Chapter 24 VDSL
IES4005M User’s Guide
169
Downstream and Upstream
Downstream refers to traffic going out from the line card to the subscriber's DSL modem or router.
Upstream refers to traffic coming into the line card from the subscriber's DSL modem or router.
DSL Profiles
A DSL profile is a table that contains a list of pre-configured DSL settings. Each DSL port has one
(and only one) profile assigned to it at any given time. You can configure multiple profiles, including
profiles for troubleshooting. Profiles allow you to configure DSL ports efficiently. You can configure
many DSL ports with the same profile, thus removing the need to configure the settings of each
DSL port one-by-one. You can also change an individual DSL port’s settings by assigning it a
different profile.
For example, you could set up different profiles for different kinds of accounts (for example,
economy, standard and premium). Assign the appropriate profile to an DSL port and it takes care of
a large part of the port’s configuration. You still get to individually enable or disable each port and
configure port specific settings. See the chapter on profiles for how to configure DSL profiles.
Alarm Profiles
Alarm profiles define DSL port alarm thresholds. The system sends an alarm trap and generates a
syslog entry when the thresholds of the alarm profile are exceeded. See the chapter on profiles for
how to configure alarm profiles.
Latency Delay
Latency delay is the number of milliseconds of interleave delay. Interleave delay determines the
size of a single block of data to be interleaved (assembled) and then transmitted. Use interleave
delay when transmission error correction (Reed- Solomon) is necessary due to a less than ideal
telephone line. It is recommended that you configure the same latency delay for both upstream and
downstream.
24.1 VDSL Commands
The following table describes commonly used parameter notation for these commands.
Table 115
VDSL Command Parameters
NOTATION DESCRIPTION
name
A name of up to 31 printable characters.
max-rate
The maximum transmission rate, 64-128000 in kbps.
min-rate
The minimum transmission rate, 32-128000 in kbps.
min-inp
The minimum number of Impulse Noise Protection (INP) Discrete Multi-Tone (DMT)
symbols. 0-32 in 0.5 symbol steps, default: 4.
upshift-nrm
The upshift noise margin 0-310 in steps of 0.1dB, default: 90
downshift-nrm
The downshift noise margin 0-310 in steps of 0.1dB, default: 30
upshift-time
The rate adaption upshift time. 0-16383 in seconds, default: 30