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Chapter 26 Diagnostic
ADSL Router Series User’s Guide
279
The following table describes the fields in this screen.
Table 100 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.
inDiscards is the number of received ATM cells that were rejected.
outPkts is the number of ATM cells that have been sent.
outDiscards is the number of ATM cells sent that were rejected.
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.
outF4Pkts is the number of ATM OAM F4 cells that have been sent.
inF5Pkts is the number of ATM OAM F5 cells that have been received.
outF5Pkts is the number of ATM OAM F5 cells that have been sent.
openChan is the number of times that the ZyXEL Device has opened a logical DSL
channel.
closeChan is the number of times that the ZyXEL Device has closed a logical DSL
channel.
txRate is the number of bytes transmitted per second.
rxRate is the number of bytes received per second.
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 ZyXEL Device sends an OAM F5
packet to the DSLAM/ATM switch and then returns it (loops it back) to the ZyXEL Device.
The ATM loopback test is useful for troubleshooting problems with the DSLAM and ATM
network.
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