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VoIP/(802.11g) ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
53
Advanced Options
ADSL Parameters help to interpret your ADSL line statistics.
SNR Margin: It is known as Signal to Noise Ration Margin. It is the relative of DSL strength to Noise ratio.
This margin is measured in decibels (dB). Higher the dB figures better the DSL strength and better
chance to get faster speed. THE HIGHER THE BETTER
Line Attenuation: it measures the signal loss in decibel (dB) between the CO DSLAM. Lower the
attenuation dB figures better the DSL strength/speed. THE LOWER THE BETTER.
CRC Errors: It is known as Cyclic Redundancy Check Error. Its checksum is to detect the transmission
error.
Latency: It includes two channels, Fast and Interleaved. It displays the channel adapted by your ISP.
Capability: There are more combinational ADSL modulation modes to be selected.
GDMT: ADSL connection will be limited to ADSL1 (G.DMT / G.Lite) only.
BIS+: ADSL connection will be limited to ADSL2+ only. (If you are ADSL1 subscriber DO NOT
select this option).
BIS+/T1413: ADSL connection will be limited to ADSL2+ and ADSL1 T1.413 only.
BIS+/BIS: ADSL connection will be limited to ADSL2+ and ADSL2 only.
BIS+/BIS/GDMT/T1413: ADSL connection will be limited to ADSL2+, ADSL2 and ADSL1
G.DMT & G.Lite & T1.413.
BIS+/BIS/T1413: ADSL connection will be limited to ADSL2+, ADSL2 and T1.413.
BIS+/BIS/GDMT: ADSL connection will be limited to ADSL2+, ADSL2 and ADS1 (G.DMT/G.Lite)
only.
DISABLE: This disable function will disconnect your ADSL synch. Select it with cautious.
S=1/2 Mode: It is ADSL1 protocols which can increase the downstream speed up to 12Mpb. Please
check further with your ISP about this option is being enabled or not.
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