ZyXEL Communications IES-1248-51 User Manual page 115

Table 17 xDSL Port Setting (continued)
LABEL
Alarm Profile
IGMP Filter Profile
ADSL2/2+ feature
Annex L
Annex M
Annex I
PMM
SRA
US INP
DS INP
Max US TX Power
Max DS TX Power
L0 Time
L2 Time
Chapter 16 xDSL Port Setup
DESCRIPTION
Select the port's alarm profile. The alarm profile defines alarm thresholds for the
ADSL port. The IES-1248-51 sends an alarm trap and generates a syslog entry
when the thresholds of the alarm profile are exceeded (see
page 135).
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 Annex M to use double upstream mode. This has the upstream
connection use tones 6 to 63.
Enable Annex I to use all digital mode. With Annex I, the ADSL connection uses
the full spectrum of the physical line and the user can not use POTS or ISDN
service. This increases the upstream data rate.
Note: The subscriber cannot use POTS or ISDN services when
you enable Annex I.
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-1248-51 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.
IES-1248-51 User's Guide
Section 17.6 on
Section 17.8 on page 138).
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