Raisecom RC802-240B User Manual - page 5
by fiber. So remote alarm is only right when optical interface is available.
1 2 3 4
ON
2.2 Internal DIP-Switch setting
2.2.1 Impedance setting of E1 interface
There are 8 groups 4-bit DIP-Switch, the number of component is S1~S8.
These switches can’t be controlled by NMS. So they can be done
manually.
OFF
The definition is as following:
1
st
2
nd
3
rd
4
th
1
st
2
nd
3
rd
4
th
ON ON ON OFF
Or
OFF OFF OFF ON
75Ω unbalanced signal effective
120Ω balanced signal effective
As shown in figure above, the default status is set as “75Ω unbalanced signal BNC interface
effective”.
75ohm unbalanced: besides setting DIP-Switch, E1 interface should be installed CC4B-8G
coax adapter on DB37 connector; this adapter converts DB37 interface to eight CC3 coax
connector. It fits 4 E1 channel input and 4 E1 channel output.
120ohm balanced: besides setting 8 groups DIP-Switch according to the table above, E1
interface should be plugged DB37 connector to fetch twisted pairs. About line order of DB37
for twisted pairs to see appendix A.
2.2.2 DIP-Switch setting
There is a group 6-bit DIP-Switch on module PCB, the series number is
S9
ON
The definition for 6-bit DIP-Switch
1
st
~4
th
bit: loop-back
OFF
1 2 3 4 5 6
1
st
2
nd
3
rd
4
th
Loop-back
OFF OFF OFF OFF
No
loop-back
OFF OFF OFF ON 1
st
E1
OFF OFF ON OFF 2
nd
E1
OFF OFF ON ON 3
rd
E1
OFF ON OFF OFF
4
th
E1
OFF ON OFF ON 5
th
E1
OFF ON ON OFF
6
th
E1
OFF ON ON ON 7
th
E1
ON OFF OFF OFF
8
th
E1
ON ON ON ON
All
E1
lines
Note: Only two test method can be set: single E1 channel loop-back or all E1 channels
loop-back. When single E1 channel loop-back is testing, the other channels are working
without disturbance.
When it is default status, loop-back can be configured directly by NMS.
5
th
bit:Choice of loop-back type
5
th
bit
Choice of loop-back type
OFF
Remote loop-back enable
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