ZyXEL Communications IES-1248-71 User Manual page 127

Table 20 xDSL Port Setting (continued)
LABEL
IGMP Filter Profile
ADSL2/2+ feature
Annex L
PMM
SRA
US INP
DS INP
Max US TX Power
Max DS TX Power
L0 Time
L2 Time
L2 ATPR
L2 ATPRT
Max L2 Rate
IES-1248-71/73 User's Guide
DESCRIPTION
The IGMP filter profile defines which multicast groups a port can join. Select a
profile of IGMP filter settings to assign to this port. Use the IGMP Filter Profile
screen to configure IGMP filter profiles (see
These are features available with ADSL2/2+. The subscriber's ADSL device
must also support the individual features in order to use them. At the time of
writing these features have not been fully tested and their performance and
interoperability cannot be guaranteed.
Enable Annex L to use reach extended ADSL2. This allows increased
connection distances.
Enable the Power ManageMent (PMM) feature to reduce the amount of power
used overall and reduce the instances of the connection going down. PMM
increases or decreases the transmission power based on line conditions. PMM
also decreases the number of service interruptions.
Select L2 to have the ADSL connection use power saving mode and reduce the
rate when there is no traffic. The rate comes back up when there is traffic.
Select L3 to use both power management modes L2 and L3. L3 puts the ADSL
connection to sleep mode.
L0 power mode uses no power reduction. See the ITU-T G.992.3 standard for
more on PMM and the power modes (states).
Enable Seamless Rate Adaptation (SRA) to have the IES-1248 automatically
adjust the connection's data rate according to line conditions without
interrupting service.
Sudden spikes in the line's noise level (impulse noise) can cause errors and
result in lost packets. Set the impulse noise protection minimum to have a buffer
to protect the ADSL physical layer connection against impulse noise. This
buffering causes a delay that reduces transfer speeds. It is recommended that
you use a non-zero setting for real time traffic that has no error correction (like
videoconferencing).
Set the minimum upstream (US) impulse noise protection setting.
Set the minimum downstream (DS) impulse noise protection setting.
Specify the maximum upstream transmit power (-256 ~ 255 in 0.1dBs).
Specify the maximum downstream transmit power (-256 ~ 255 in 0.1dBs).
Set the minimum time (in seconds) that the ADSL line must stay in L0 power
mode before changing to the L2 power mode.
Set minimum time (in seconds) that the ADSL line must stay in the L2 power
mode before reducing the power again in the L2 power mode.
Set the maximum Aggregate Transmit Power Reduction (ATPR) in decibels
(dB) that is permitted in a L2 power reduction. The system can gradually
decrease the ADSL line transmission power while it is in the L2 power mode.
This is the largest individual power reduction allowed in the L2 power mode.
Set the maximum Aggregate Transmit Power Reduction Total (ATPRT) in
decibels (dB) that is permitted in the L2 power mode. This is the total transmit
power decrease that is allowed to occur in the L2 power mode.
Set the maximum transfer rate (in Kilobits per second) that is permitted while the
port is in the L2 power mode. The supported range is 32~4096 Kbps in 4 Kbps
increments. If you enter a number that is not a multiple of 4, the system uses the
next lower multiple of 4. If you enter 39, for example, the system will use 36. Set
this to 0 to have the system automatically assign a value.
Chapter 16 xDSL Port Setup
Section 17.8 on page 148).
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