Advertisement
by fiber. So remote alarm is only right when optical interface is available.
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.
The definition is as following:
st
nd
1
2
ON
ON
75¦ ¸
unbalanced signal effective
As shown in figure above, the default status is set as "75¦ ¸
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
The definition for 6-bit DIP-Switch
st
th
1
~4
bit: loop-back
st
1
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
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.
th
5
bit£ º Choice of loop-back type
th
5
OFF
rd
th
3
4
ON
OFF
nd
2
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
ON
bit
Choice of loop-back type
Remote loop-back enable
st
1
Or
OFF
120¦ ¸
balanced signal effective
unbalanced signal BNC interface
rd
th
3
4
OFF
OFF
OFF
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
ON
OFF
OFF
ON
ON
ON
OFF
1 2 3 4
nd
rd
2
3
OFF
OFF
ON
OFF
Loop-back
No 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
All E1 lines
th
4
ON
1 2 3 4 5 6
- 3 -
Advertisement
