EXFO VDSL2 - Manual (Page 179)

Running CPE Tests
Copper, VDSL2, ADSL2+, and IP Triple-Play Test Set 171
Reading Results
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VPI is the virtual path identifier (VPI) ranging from 0 through 255 for the
ATM connection.
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VCI is the virtual circuit identifier (VCI) ranging from 32 through 65535
for the ATM connection.
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Assigned IP is the IP address information assigned to the unit that is
actively connected to your network or the internet at the time of login.
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Gateway is the IP address of the default gateway.
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Subnet Mask is the network address used to identify if the IP address is
within the same wide area network.
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DNS1 is the address of the primary domain name server to be used by
the unit.
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DNS2 is the address of the secondary domain name server to be used
by the unit.