ZyXEL Communications VMG4005-B50A, User Manual, Page: 62 / 86

Chapter 17 Diagnostic
VMG4005-B50A/B60A User’s Guide
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The following table describes the labels in this screen.
17.6 OAM Ping
Click Maintenance > Diagnostic > OAM Ping to open the screen shown next. Use this screen to perform
an OAM (Operation, Administration and Maintenance) F4 or F5 loopback test on a PVC. The VMG sends
an OAM F4 or F5 packet to the DSLAM or ATM switch and then returns it to the VMG. The test result then
displays in the text box. ATM sets up virtual circuits over which end systems communicate. The
terminology for virtual circuits is as follows:
Figure 45 Virtual Circuit Topology
Table 26 Maintenance > Diagnostics > 802.3ah
LABEL DESCRIPTION
IEEE 802.3ah Ethernet OAM Click this switch to enable or disable the Ethernet OAM on the specified interface.
When the switch goes to the right
, the function is enabled. Otherwise, it is not.
Interface Select the interface on which you want to enable the IEEE802.3ah.
OAM ID Enter a positive integer to identify this node.
Auto Event Click this switch to detect link status and send a notification when an error (such as
errors in symbol, frames, or seconds) is detected. Otherwise, disable this and you will
not be notified. When the switch goes to the right
, the function is enabled.
Otherwise, it is not.
Features Select Variable Retrieval so the VMG can respond to requests for information, such
as requests for Ethernet counters and statistics, about link events.
Select Link Events so the VMG can interpret link events, such as link fault and dying
asp.Link events are set in event notification PDUs (Protocol Data Units), and indicate
when the number of errors in a certain given interval (time, number of frames,
number of symbols, or number of errored frame seconds) exceeds a specified
threshold. Organizations may create organization-specific link event TLVs as well.
Select Remote Loopback so the VMG can accept loopback control PDUs to convert
VMG into loopback mode.
Select Active Mode so the VMG initiates OAM discovery, send information PDUs; and
may send event notification PDUs, variable request/response PDUs, or loopback
control PDUs.
Apply Click this button to save your changes.
• Virtual Channel (VC) Logical connections between ATM devices
• Virtual Path (VP) A bundle of virtual channels
• Virtual Circuits A series of virtual paths between circuit end points