ZyXEL Communications PRESTIGE 653HX User Manual page 272

Prestige 653HWI Series User's Guide
LABEL
ATM Loopback Click this button to start the ATM loopback test. Make sure you have configured at least
Test one PVC with proper VPIs/VCIs before you begin this test. The Prestige sends an OAM
F5 packet to the DSLAM/ATM switch and then returns it (loops it back) to the Prestige.
The ATM loopback test is useful for troubleshooting problems with the DSLAM and ATM
network.
Upstream Noise Click this button to display the upstream noise margin.
Margin
Downstream Click this button to display the downstream noise margin.
Noise Margin
Back Click this button to go back to the main Diagnostic screen.
22.5.3 Diagnostic ISDN Line Screen
Click Diagnostic and then ISDN Line to open the screen shown next.
22-12
Table 22-7 Diagnostic DSL Line
DESCRIPTION
Maintenance