ZyXEL Communications Corporation P660HNT1AV2 Manuel D’Utilisation

Chapter 25 Diagnostic

P-660HN-Tx(A) v2 User’s Guide

Use this screen to view the DSL line statistics and reset the ADSL line. Click Maintenance > 
Diagnostic > DSL Line to open the screen shown next.

Maintenance > Diagnostic > DSL Line

The following table describes the fields in this screen.  

Maintenance > Diagnostic > DSL Line

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.

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.

outPkts is the number of ATM cells that have been sent.

outDiscards is the number of ATM cells sent that were rejected.

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.

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 ADSL Router sends an OAM F5 
packet to the DSLAM/ATM switch and then returns it (loops it back) to the ADSL Router. 
The ATM loopback test is useful for troubleshooting problems with the DSLAM and ATM 
network.