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"ON": Mask unused E1' s alarm; "OFF": No mask unused E1' s alarm
RING / MUTE:
Push in: enable the alarm ring. If alarm appears, there will be "zi...zi..." ring.
Push out: disable the alarm ring.
4.1.4. DIP-Switch of front panel: (default all
"OFF")
The dip-switches on the front panel are used to set E1 remote loop-back test and Ethernet port isolation
functions.
st
1
on left side: enable/disable loop-back
nd
th
2
~4
: loop-back on remote site
Note: Only one loop-back test can be set: single E1 channel loop-back. It functions only when the
loop-back is enabled and there is not alarm at the optical interface. When single E1 tributary loop-back
is testing, the other tributaries are working without disturbance.
Bit error tester
E1
Figure: sketch map of setting remote loop-back on local site
Note: When setting loop-back on local site, the 1
must be all off (no loop-back).
th
5
bit: DIP-switch for FPT
st
1
OFF
ON
nd
rd
2
3
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
ON
OFF
ON
OFF
ON
ON
ON
ON
Multipl
exer
Local
OFF
ON
Loop-back
Disable
Enable
th
4
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Fiber
Multipl
exer
st
th
– 4
bits of the DIP-switch at remote site
9
Raisecom Technology Co., Ltd
1 2 3 4 5 6
1 2 3 4 5 6 7 8
Loop-back
st
1
E1
nd
2
E1
rd
3
E1
th
4
E1
th
5
E1
th
6
E1
th
7
E1
th
8
E1
E1
Remote
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