Operation Manual

Cerberus ADSL2+ Lite (P 6311-07)
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• LAN
IP Address – The LAN port IP address.
Subnet Mask – The LAN port IP subnet mask.
DHCP Server – The status of DHCP Server (Enabled or Disabled).
NAT – The status of NAT Service (Enabled or Disabled).
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• WAN
Virtual Circuit – Click the drop-down list and select the name of the Virtual Circuit on
which the system status is to be shown.
Status – Connected or Not Connected.
Connection Type – The WAN Connection Type.
IP Address / Subnet Mask / Default Gateway / DNS Server – Connection parameters.
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• ADSL
ADSL Firmware Version – This field displays current ADSL firmware version.
Line State – This field displays the ADSL connection process and status.
Modulation – This field displays the ADSL modulation status for G.dmt or T1.413.
Annex Mode – This field displays the ADSL annex modes for Annex A.
Downstream / Upstream – Status of SNR Margin, Line Attenuation and Data Rate:
• SNR Margin – Amount of increased noise that can be tolerated while maintaining
the designed BER (bit error rate). The SNR Margin is set by Central Office DSLAM.
If the SNR Margin is increased, bit error rate performance will improve, but the data
rate will decrease. Conversely, if the SNR Margin is decreased, bit error rate
performance will decrease, but the data rate will increase.
• Line Attenuation – Attenuation is the decrease in magnitude of the ADSL line
signal between the transmitter (Central Office DSLAM) and the receiver (Client
ADSL Modem), measured in dB. It is measured by calculating the difference in dB
between the signal power level received at the Client ADSL Router and the
reference signal power level transmitted from the Central Office DSLAM.