METRObility Optical Systems Delta Class Installation And User Manual page 18

If the RLBK switch setting on the local "twister" is changed from ON to
OFF before the remote card resets itself, the LB FAIL LED on the remote
unit may be amber for a few seconds. This is because the remote port
has not timed out and is still in loopback mode waiting to receive test
patterns. The remote port will resume normal operation after the time out
occurs, which will be in less than 15 seconds.
Time Out Indications
L o c l a L B F A L I
C l o r o
n I d c i t a
s ( a t u t ) s
R e m o
s t i e f l
A m b r e d t a , a
( r b e i ) f e r m o
s w c t i
o n h t
18 Metrobility 100Mbps Delta Class "twister"
L E D
o i n
e t p o t r h a s e r s t e
o t b e g n i p a s s n i g
h o w e v e , r h t e
e t o l o p b a k c
h s i s l l i t e n a b e l d
e o l c l a u n . t i
R e m o e t L B F A L I
C l o r o
n I d c i t a
s ( a t u t ) s
A m b r e T h e e r
( e l s s o n h t e
h t a n 1 5 d s i a b
s e c o n d ) s h a s n
L E D
o i n
m o e t o l o p b a k c
o l c l a u n t i h a s b
e l , d b t u h t e e r m o
t o i t m e d o t u y e . t
s w c t i h
e e n
e t p o t r