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Error bit tester
E1
Error bit tester
E1
Note£ º When any loop-back is setting on local site, 1
must be all off.
DIP-Switch of remote loop-back default setting is configured as enable. This status can neither be
inquired nor controlled by NMS. So it should not be modified. Only when you test device's
performance right or not, DIP-Switch is for auxiliary function. Please keep default setting when
loop-back is controlled by NMS.
th
6
bit£ º DIP-switch for FPT
When FPT is disabled£ ¬ it's similar to AIS of traditional multiplexers. When E1 signal on remote site
is lost£ ¬ the E1 output opposite of local site is "1"£ » when optical signal at local site is lost £ ¬ all E1
output are "1" on local site.
FPT enable: when there is alarm of LOS on any direction of optical interface£ ¬ both sides E1 output
can not transmit HDB3 coding. At this circumstance, alarm on terminal device (such as switches,
converters, SDH) of E1 link will be LOS£ ¬ not AIS alarm.
This function is for some special need. It can be inquired, but can't be controlled. So if it is
required to start, it must be forced manually.
ON
Local loop-back enable
Multipl
exer
Local
Figure2: sketch map of setting remote loop-back on local site
Multipl
exer
Local
Figure3: sketch map of setting local loop-back on local site
th
6
bit
FPT
OFF
Disable£ ¨ complies with AIS £ ©
ON
Enable
Fiber
Multipl
exer
Fiber
Multipl
exer
st
th
~4
loop- back DIP-switch of remote site
E1
Remote
E1
Remote
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