Loops; Figure 8: Loops On The E1 Port - ABB FOX61 Series User Manual

O P E R A T I O N A N D M A I N T E N A N C E
LED name Colour
TRAFFIC Red
Off
7.2

Loops

28
Table 6: LED signalling on LEDE1 (continued)
State Meaning
Failure One or more active failures on the unit, independent of the sever-
ity.
More detailed information is provided by FOXCST.
Normal Normal (error free) operation.
The LEDE1 unit offers as a maintenance feature to apply loops in the E1
port managed object.
When applying a loop the operational state of the port changes to "Testing"
and the "Maintenance Function Active" (MFA) alarm is activated.
All loops on the LEDE1 unit are not transparent, i.e. the forwarded signal is
replaced by an AIS.
The available loops on the E1 port managed object are shown in the figure
below:
• Front To Front,
• Back To Back.
Only one loop can be active at the same time.
Front To Front
Signal
Processing
(P12)
AIS
Figure 8: Loops on the E1 port
LEDE1
AIS
Line
Interface
Back To Back
E1 port

FOX61x LEDE1