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<h1>BTS-TC Connection Establishment Supervision</h1>

<p>The purpose of the feature is to provide means to observe
faults in alignment between TRXs and individual TC channels. An alarm is generated
on those circuits that cannot carry traffic. The CONNECTION FAILURE -message
from the BTS with a cause 'remote transcoder alarm' is supervised per circuit
between BTS and TC, A- and Abis-interface.</p>


<p>If a certain number (threshold can be set using the MML
in the A interface) of successive call attempts fails on one circuit, an alarm
will be written to the local alarm printer. The NetAct will be informed of
the event as well. The reason for the  failure must be the same every time:
REMOTE TRANSCODER FAILURE. When this happens, it is evident that the circuit
is to blame for the failure in the connection establishment.</p>


<p>This feature is complementary to the TC supervision function
(supervision by the TCSM, alarms via Q1 bus). TC supervision supervises individual
TC channels. These features together make it easier for the operator to find
out some configuration errors (routing, semi-permanent connections, etc.).</p>
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