ABB FOX61 Series, User Manual

Page: 28 / 52

O P E R A T I O N A N D M A I N T E N A N C E
28 FOX61x

LEDE1
7.2 Loops
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.
Figure 8: Loops on the E1 port
TRAFFIC Red Failure One or more active failures on the unit, independent of the sever-
ity.
More detailed information is provided by FOXCST.
Off Normal Normal (error free) operation.
Table 6: LED signalling on LEDE1 (continued)
LED name Colour State Meaning
Signal
Processing
(P12)
E1 port
Line
Interface
Back To Back
Front To Front
AIS
AIS
LEDE1
PBUS