User Manual
SUPM1
page 46 of 94© KEYMILE December 2015 EN/LZTBU 372 129/1 RC
94
Functional Description
Figure 12: Digital test loop for voice signals
A test loop can be applied even if the subscriber is busy.
Risk of operating trouble!
An ongoing call will be interrupted in direction towards the network.
An active test loop activates the MFA (maintenance function active) alarm on
the port.
analogue line
Hybrid
loop
active
towards
netw or k
D/A
con-
version
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