User`s manual

Moxa Managed DSL Ethernet Extender Featured Functions
3-11
• Symmetric speed:
100M/100M, 75M/75M, 60M/60M, 40M/40M, 30M/30M,
25M/25M, 20M/20M, 15M/15M, 10M/10M, 5M/5M, 4M/4M,
3M/3M, 2M/2M, 1M/1M
NOTE
Device will try to attain the set speed. If line condition degrades
(reducing SNR) but the device is able to
maintain
the link, the DSL SNR/SPEED LED is the indicator to notify user of the reduced SNR. However, if the
line condition is too poor to m
aintain the link, the connected pairs will
try to maintain the speed at 256 kbps
under acceptable line conditions. Users can
check the actual connection speed from ‘Monitor page’. If the speed
is set to 256 kbps, it means that the fixed speed can’t be maintained based on the line conditions.
INP
The IEX-402-VDSL2 series supports two communication modes; STD (standard) and INP (impulse noise
protection). Both are configured by DIP switch.
According to the ITU-993.2 standard, INP is an error correction algorithm as the number of consecutive DMT
symbols or fractions, as seen at the input to the de-interleaver, for which errors can be completely corrected
by the error correcting code.
In STD (standard) mode, the packet will be directly transmitted with latency under 2 ms while INP mode has
under 8 ms transmission latency with 500 μs interleave DMT.
Setting Description Factory Default
INP mode status Indicates whether INP mode is enabled or disabled based on
DIP switch configuration
Disabled
SPEED/SNR Status
The IEX-402-VDSL2 series supports two parameters displayed on the DSL SPEED/SNR LED indicator. One is
transmission speed and the other is the signal-to-noise ratio (SNR) of the connection. By selecting the
hardware DIP switch, SNR/SPEED reflects what will be displayed for DSL SPEED/SNR LED indicator on device
front panel.
Setting Description Factory Default
LED indicator status Displays SPEED/SNR DIP switch configuration SPEED
Link Fault Pass-Through
If the Ethernet or DSL connection is down, the device will not be notified that the connection has been
terminated. The device will continue to transmit packets and wait idly for a response that never arrives—and
the longer the wait, the higher the possibility that packets will be lost.
With link fault pass through (LFP), a troubleshooting function that drastically reduces the waiting time, enables
Moxa IEX series products to force Ethernet link down to prevent data loss.