User`s manual

VoIP/(802.11g) ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
52
Advanced Options
ADSL Parameters help to interpret your ADSL line statistics.
SNR Margin: Signal to Noise Ratio Margin. It is the DSL signal strength to Noise ratio. This margin is
measured in decibels (dB).
The higher the dB figure, the better the DSL signal strength and better chance to get faster speeds.
Line Attenuation: Measures the signal loss in decibel (dB) between the CO DSLAM and the router.
The lower the attenuation dB figures, the better the DSL strength/speed.
CRC Errors:
Cyclic Redundancy Check Errors. CRC is a checksum used to detect transmission errors.
The
less
errors the better.
Latency: Displays the channel type used by your ISP - Fast or Interleaved.
Capability: Sets the combination of ADSL modulation modes to be selected.
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 GDMT: ADSL connection will be limited to ADSL1 (G.DMT / G.Lite) only.
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BIS+:
ADSL connection will be limited to ADSL2+ only. (If you are ADSL1 subscriber DO NOT
select this option).
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 BIS+/T1413: ADSL connection will be limited to ADSL2+ and ADSL1 T1.413 only.
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 BIS+/BIS: ADSL connection will be limited to ADSL2+ and ADSL2 only.
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 BIS+/BIS/GDMT/T1413: ADSL connection will be limited to ADSL2+, ADSL2 and ADSL1 G.DMT
& G.Lite & T1.413.
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 BIS+/BIS/T1413: ADSL connection will be limited to ADSL2+, ADSL2 and T1.413.
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 BIS+/BIS/GDMT: ADSL connection will be limited to ADSL2+, ADSL2 and ADS1 (G.DMT/G.Lite)
only.
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 DISABLE: This disable function will disconnect your ADSL synch. Select it with cautious.
S=1/2 Mode: An ADSL1 protocol that can increase the downstream speed up to 12Mpb. Please check
further with your ISP about this option being enabled or not.