User manual

Raisecom Technology Co., Ltd
9
1 2 3 4 5 6
OFF
ON 1 2 3 4 5 6 7 8
4.1.3. Button
z MASK / UNMASK:
“ON”: Mask unused E1 link alarm; “OFF”: Not mask unused E1' s alarm
z RING / MUTE:
Press on: enable the alarm ring. If alarm appears, there will be “zi…zi…” ring.
Press off: 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.
z 1
st
on left side: enable/disable loop-back
1
st
Loop-back
OFF Disable
ON Enable
z 2
nd
~4
th
: loop-back on remote site
2
nd
3
rd
4
th
Loop-back
OFF OFF OFF 1
st
E1
OFF OFF ON 2
nd
E1
OFF ON OFF 3
rd
E1
OFF ON ON 4
th
E1
ON OFF OFF 5
th
E1
ON OFF ON 6
th
E1
ON ON OFF 7
th
E1
ON ON ON 8
th
E1
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.
Figure: sketch map of setting remote loop-back on local site
Note: When setting loop-back on local site, the 1
st
– 4
th
bits of the DIP-switch at remote site
Local Remote
Fiber
E1
E1
Multipl
exer
Bit error tester
Multipl
exer