Chapter 26 Diagnostic
AMG1312-T10D User’s Guide
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The following table describes the fields in this screen.
Table 93
Maintenance > Diagnostic > DSL Line
LABEL
DESCRIPTION
ATM Status
Click this to view your DSL connection’s Asynchronous Transfer Mode (ATM) statistics.
ATM is a networking technology that provides high-speed data transfer. ATM uses fixed-
size packets of information called cells. With ATM, a high QoS (Quality of Service) can be
guaranteed.
The (Segmentation and Reassembly) SAR driver translates packets into ATM cells. It also
receives ATM cells and reassembles them into packets.
These counters are set back to zero whenever the device starts up.
inPkts
is the number of good ATM cells that have been received.
inF4Pkts
is the number of ATM Operations, Administration, and Management (OAM) F4
cells that have been received. See ITU recommendation I.610 for more on OAM for ATM.
inF5Pkts
is the number of ATM OAM F5 cells that have been received.
inDiscards
is the number of received ATM cells that were rejected.
outPkts
is the number of ATM cells that have been sent.
outF4Pkts
is the number of ATM OAM F4 cells that have been sent.
outF5Pkts
is the number of ATM OAM F5 cells that have been sent.
outDiscards
is the number of ATM cells sent that were rejected.
ATM Loopback
Test
Click this to start the ATM loopback test. Make sure you have configured at least one PVC
with proper VPIs/VCIs before you begin this test. The Device sends an OAM F5 packet to
the DSLAM/ATM switch and then returns it (loops it back) to the Device. The ATM
loopback test is useful for troubleshooting problems with the DSLAM and ATM network.
DSL Line Status
Click this to view statistics about the DSL connections.
noise margin downstream
is the signal to noise ratio for the downstream part of the
connection (coming into the Device from the ISP). It is measured in decibels. The higher
the number the more signal and less noise there is.
output power upstream
is the amount of power (in decibels) that the Device is using to
transmit to the ISP.
attenuation downstream
is the reduction in amplitude (in decibels) of the DSL signal
coming into the Device from the ISP.
Discrete Multi-Tone (DMT) modulation divides up a line’s bandwidth into sub-carriers (sub-
channels) of 4.3125 KHz each called tones. The rest of the display is the line’s bit
allocation. This is displayed as the number (in hexadecimal format) of bits transmitted for
each tone. This can be used to determine the quality of the connection, whether a given
sub-carrier loop has sufficient margins to support certain ADSL transmission rates, and
possibly to determine whether particular specific types of interference or line attenuation
exist. Refer to the ITU-T G.992.1 recommendation for more information on DMT.
The better (or shorter) the line, the higher the number of bits transmitted for a DMT tone.
The maximum number of bits that can be transmitted per DMT tone is 15. There will be
some tones without any bits as there has to be space between the upstream and
downstream channels.
Reset ADSL Line
Click this to reinitialize the ADSL line. The large text box above then displays the progress
and results of this operation.
Summary of Contents for AMG1312-T10D
Page 4: ...Contents Overview AMG1312 T10D User s Guide 4 ...
Page 12: ...Table of Contents AMG1312 T10D User s Guide 12 ...
Page 18: ...Chapter 1 Introduction AMG1312 T10D User s Guide 18 ...
Page 24: ...Chapter 2 Introducing the Web Configurator AMG1312 T10D User s Guide 24 ...
Page 74: ...Chapter 6 Wireless AMG1312 T10D User s Guide 74 ...
Page 100: ...Chapter 7 Home Networking AMG1312 T10D User s Guide 100 ...
Page 138: ...Chapter 13 Filter AMG1312 T10D User s Guide 138 ...
Page 158: ...Chapter 15 Parental Control AMG1312 T10D User s Guide 158 ...
Page 166: ...Chapter 16 Certificates AMG1312 T10D User s Guide 166 ...
Page 172: ...Chapter 17 System Monitor AMG1312 T10D User s Guide 172 ...
Page 174: ...Chapter 18 User Account AMG1312 T10D User s Guide 174 ...
Page 178: ...Chapter 20 System AMG1312 T10D User s Guide 178 ...
Page 184: ...Chapter 22 Log Setting AMG1312 T10D User s Guide 184 ...
Page 190: ...Chapter 24 Backup Restore AMG1312 T10D User s Guide 190 ...
Page 202: ...Chapter 25 Remote Management AMG1312 T10D User s Guide 202 ...
Page 206: ...Chapter 26 Diagnostic AMG1312 T10D User s Guide 206 ...
Page 218: ...Appendix A Legal Information AMG1312 T10D User s Guide 218 Environmental Product Declaration ...