SOHOSpeed ADSL2/2+ Ethernet/Wireless Gateway User’s Manual
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3.8.7 Modem
Test
The Modem Test page is used to check the connectivity to the WAN. This test ay take a few
seconds to complete. Before running this test, make sure you ave at least one WAN
connection configured and have a valid DSL link. If the SL link is not connected, the test will
fail. Also make sure the DSLAM supports this feature. Not all DSLAMs have F4 and F5
support. F4/F5 cells are used for operation, administration, and maintenance (OAM) on ATM
level. They are used for two main purposes:
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Fault management (detection and notification)
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Loopback testing and link integrity
The ATM OAM is divided into several levels:
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F4: VP level. OAM information flows between network elements (NEs) used within
virtual paths to report an unavailable path or a virtual path (VP) that cannot be
guaranteed. Segment flows are processed, as well as end-to-end flows that terminate in
the management processor.
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F5: VC level. OAM information flows between network elements (NEs) used within
virtual connections to report degraded virtual channel (VC) performance such as late
arriving cells, lost cells, and cell insertion problems. Segment flows are processed, as
well as end-to-end flows that terminate in the management processor.
Both F4 and F5 flows can be configured as one of the test types:
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Segment: This test verifies that ATM continuity exists between the virtual channel link
segment from the SOHOSpeed to the DSL provider network (typically this is a DSLAM
at the DSL provider site).
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End-to-End: This test verifies ATM connectivity of the virtual channel link with the ATM
endpoint, such as a remote broadband access router located at the DSL provider or ISP
site.
