Ambit U10C034, User Manual

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U10C034 Telephony Version v1.4 June 2008
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than 150 K Ohms.
Ringers Test
This test determines the presence of appropriate ringer terminations on the
customer line. The test provides a fail indication when the equivalent ringer load
across tip and ring is less than 0.175 REN or greater than 5 REN. During this test
a low voltage AC signal is applied to the line. The voltage and current across the
load are measured as the AC signal is applied. The ringing voltage is below the
required level to activate a ring so audible ringing will not occur. The measured
AC resistance is linearly proportional to the load on the endpoint in question and
is converted to REN units. If this value is below 0.175 REN or above 5 REN the
test fails. If not, this test passes.
Off hook Simulation Test
This test simulates an off hook condition by utilizing an external relay. The test
provides a pass indication if the following sequence of events occurs successfully.
First, the MTA causes the external relay to simulate an off hook condition.
Second, the MTA detects the off hook condition and sends a NTFY event to the
CMS. Third the CMS acknowledges this NTFY and sends an RQNT to play dial
tone. If all of these conditions occur within two second the test passes. After the
test is completed the relay is disabled and the off hook condition ceases
regardless of whether the test was successful or not. Note: this test will not pass
unless a CMS is active that will request dial tone upon receiving a notification of
off hook from the MTA.
Self Check Test
This test verifies that several of the voice support modules of the MTA are
operating correctly. In particular this test uses a variety of methods to verify that
the APM, the DSP core software, and the HVG are all functioning as expected. If
any of these modules is not operating as expected this test fails and an error is
reported in the MIB. If each module is functioning as expected the test passes
The below table enumerates the applicable MIBS for conducting the telephony
port diagnostics. When executing any of these tests you must always set the
startForceTestExecution bit which tells the software that I am running a line
diagnostic test as opposed to an actual call.
brcm-emta-mgmt.mib
MIB Default Value Access
emtaSignalingEndptCtrlDiagTestsStart read-write
emtaSignalingEndptCtrlDiagTestsStop read-write
emtaSignalingEndptCtrlDiagTestValid read
emtaSignalingEndptCtrlDiagTestValue read