Wire Tech WR-1004MLD User manual

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WR-1004MLD Outdoor Optical Node Operation and Maintenance Manual
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1. Product Summary
WR-1004MLD outdoor optical node can be configured 2 forward path optical receiver modules, 2
return path optical transmitter modules, 1 Ethernet transponder module and 2 switching power
supply modules at most. Adopts advanced optical AGC technology, the adjustment of output level
and output slope both adopt fixed inserter. Add LED nixie tube display function, can output 4-way
forward path signal (≥108dBμV) at most.
2. Performance Characteristics
Forward path optical receiving part adopts advanced optical AGC technology, the input optical
power range extended to -8～+2dBm.
Forward path optical receiving part: RF operating bandwidth extended to 1GHz, each way
maximum output level up to 114dBμv.
The attenuation and equilibrium control circuit adopts fixed inserter, and achieve remote
monitoring by NMS.
RF amplifier part adopts quick plug modular design, can quickly replace RF amplifier module
without dismantling the RF cable connector.
Built-in perfect condition monitoring circuit, and support Ethernet transponder.
Built-in tri-state gate switch circuit in the return path. Three states passthrough, -6dB and OFF
can be remote set by network management responder.
Reserved C-CMTS forward path and return path RF interface, support DOCSIS EOC
networking scheme.
3. Technique Parameter
3.1 Link Testing Conditions
The performance parameters of this manual according to the measuring method of GY/T 194-2003
< Specifications and methods of measurement on optical node used in CATV systems >, and tested
in the following conditions.
1. Forward optical receive part: with 10km standard optical fiber, passive optical attenuator and
standard optical transmitter composed the testing link. Set 59 PAL-D analog TV channel signal at
range of 45/87MHz～550MHz under the specified link loss. Transmit digital modulation signal at
range of 550MHz～862/1003MHz, the digital modulation signal level (in 8 MHz bandwidth) is
10dB lower than analog signal carrier level. When the input optical power of optical receiver is
-1dBm, the RF output level is 108dBμV independent output, with 8dB output tilt, measure the
C/CTB, C/CSO and C/N.
2. Return optical transmit part: Link flatness and NPR dynamic range are the link indexes which
is composed of return path optical transmitter and optical receiver.
Note: When the rated output level is the system full configuration and the receiving optical power is
-1dBm, equipment meets the maximum output level of link index. When the system configuration
degrade (that is, the actual transmission channels reduce), the output level of equipment will be
increased.
Friendly Notice: Suggest you setting the RF signal to 6~9dB slope output in the practical
engineering application to improve the nonlinear index (behind the node) of the cable system.

WR-1004MLD Outdoor Optical Node Operation and Maintenance Manual
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3.2 Performance Parameters
Item
Unit
Performance Parameters
Forward Part
Optical Parameters
Optical AGC control range
dBm
+2～-8/-7/-6/-5 adjustable
Optical Return Loss
dB
>45
Optical Receiving Wavelength
nm
1100 ~ 1600
Optical Connector Type
—
FC/APC, SC/APC or specified by the user
Optical Fiber Type
—
Single mode
Link Performance
C/N
dB
≥ 51
-1dBm optical input,
output level 108dBμV,
EQ 8dB
C/CTB
dB
≥ 65
C/CSO
dB
≥ 60
RF Parameters
Frequency Range
MHz
45/85 ~862/1003
Flatness in Band
dB
±0.75
Rated Output Level
dBμV
≥ 108
(when the optical AGC control range is +2～-8)
Max Output Level
dBμV
≥ 114
(when the optical AGC control range is +2～-5)
Output Return Loss
dB
(85 ~550MHz) ≥16 / (550~1000MHz) ≥14
Redundant Receiver Isolation
dB
≥75
Output Impedance
Ω
75
Return Part
Optical Parameters
Optical Transmit Wavelength
nm
1310±10, 1550±10 or specified by the user
Laser Type
—
DFB or FP laser
Output Optical Power
mW
1
Optical Connector Type
—
FC/APC, SC/APC (or specified by the user)
RF Parameters
Frequency Range
MHz
5 ~ 65 (or specified by the user)
Flatness in Band
dB
±0.75
Input Level
dBμV
75~ 85
Input Return Loss
dB
≥16
Independent Transmit
Isolation
dB
≥60
Input Impedance
Ω
75
NPR dynamic range
dB
≥15 (NPR≥30 dB)
Use DFB laser
≥10 (NPR≥30 dB)
Use FP laser

WR-1004MLD Outdoor Optical Node Operation and Maintenance Manual
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RF Parameters of C-CMTS interface
CMTS_DS
forward path insertion port
level
dBμV
100±2
CMTS_US
return path output gain
dB
0±1
Port～CMTS_US OUT
Isolation (forward path—
CMTS_US return path output)
dB
≥70
General Performance
Power voltage
V
A：AC（150~265）V；B：AC（35~90）V
Feed current through
A
10
Operating temperature
℃
-40~+60
Storage temperature
℃
-40~+70
Relative humidity
%
Max 95% no condensation
Consumption
VA
≤ 42
Dimension
mm
460（L）×282（W）×175（H）
4 Block Diagram
5. Relation Table of Input Optical Power and CNR

WR-1004MLD Outdoor Optical Node Operation and Maintenance Manual
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WR-1004MLD Outdoor Optical Node Operation and Maintenance Manual
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6. Function Display and Operating Instruction

WR-1004MLD Outdoor Optical Node Operation and Maintenance Manual
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7. Structure Diagram
Upper cover:
1. CMTS return path output
2. Up key
3. Down key
4. Enter key
5. Operating instructions and fiber splice tray
6. Nixie tube display screen
7. Inserter
8. Redundant power output
9. Power module 2 220Vac socket
10. Power module 2 socket
11. Power module 1 220Vac socket
12. Power module 1 socket
13. 220Vac input
14. The RF output test port (-20dB) of forward path
optical receiver modules
15. RF output of forward path optical
receiver modules
16. The RF input interface of return path optical
transmit modules 1
17. The RF input interface of return path
optical transmit modules 2
18. Power 1 fuse
19. Power module 1
20. Power 2 fuse
21. Power module 2
22. Forward path optical receiver modules 1
23. Forward path optical receiver modules 2
24. Return path optical transmit modules 1
25. Return path optical transmit modules 2
26. NMS transponder module

WR-1004MLD Outdoor Optical Node Operation and Maintenance Manual
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Bottom Cover:
1. Fixed screw
2. Port1 forward path output test port (-20dB)
3. Port 1
4. Port 1 feed fuse
5. CMTS forward path IN
6. Handle *
7. Port 4 feed fuse
8. Port 4
9. Port 4 forward path output test port
(-20dB)
10. Data interface
11. Main board power input
12. Port 1 return path input test port (-20dB)
13. Forward path RF input
14. Port 4 return path input test port (-20dB)
15. Return path RF output 2
16. Return path RF output 1
17. Mode setting and attenuation jumper
18. Return path components
19. Port 3 return path input test port (-20dB)
20. Port 2 return path input test port (-20dB)
21. Port 2 forward path output test port
(-20dB)
22. Port 2
23. Port 2 feed fuse
24. AC60V independent feed port
25. Handle *
26. Port 3 feed fuse
27. Port 3
28. Port 3 forward path output test port (-20dB)
* Turn off the five fixed screws before take out the module with handles.

WR-1004MLD Outdoor Optical Node Operation and Maintenance Manual
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8. NMS setup instructions
If users configured the network management responder, need to do the following settings:
Responder IPsetup instruction:
Network management directly modify:
1. Default IP is 192.168.1.168，default gateway is 192.168.1.1，default subnet mask is
255.255.255.0
2. Connect the computer and responder (can be direct connected), and change the computer
IP to 192.168.1.XXX (XXX is any number from 0 to 255 except 168); start upper
computer network management software, then search the device and log in.
3. Right-click device icon and choose modify the device IP.
4. Enter new IP address, gateway and subnet mask.
5. Click modify，then exit, it is done. There will show new IP address and gateway on
operational logbook.
6. Reboot the responder, the new IP take effect (Click the reboot button in the network
management software or power on again)

WR-1004MLD Outdoor Optical Node Operation and Maintenance Manual
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9. Common Failure Analysis and Troubleshooting
Failure phenomenon
Failure cause
Solution
After connecting the
network, the image of
the optical contact point
has obvious netlike
curve or large particles
highlights but the image
background is clean.
1. The optical input power of the
optical receiver is too high, make
the output level of the optical
receiver module too high and RF
signal index deteriorate.
2. The RF signal (input the optical
transmitter) index is poor.
1. Check the optical input power and make
appropriate adjustments to make it in the
specified range; or adjust the attenuation of
optical receiver to reduce the output level
and improve index.
2. Check the front end machine room optical
transmitter RF signal index and make
appropriate adjustments.
After connecting the
network, the image of
the optical contact point
has obvious noises.
1. The optical input power of the
optical receiver is not high
enough, results in the decrease of
C/N.
2. The optical fiber connector or
adapter of the optical receiver has
been polluted.
3. The RF input signal level of the
optical transmitter is too low,
make the modulation degree of the
laser is not enough.
4. The C/N index of system link
signal is too low.
1. Check the received optical power of the
optical contact point and make appropriate
adjustments to make it in the specified range.
2. Improve the optical received power of the
optical contact point by cleaning the optical
fiber connector or adapter etc methods.
Specific operation methods see “Clean and
maintenance method of the optical fiber
connector”.
3. Check the RF input signal level of the
optical transmitter and adjust to the required
input range. (When the input channels
number less than 15, should be higher than
the nominal value.)
4. Use a spectrum analyzer to check the
system link C/N and make appropriate
adjustments. Make sure the system link
signal C/N﹥51dB.
After connecting the
network, the images of
several optical contact
points randomly appear
obvious noises or bright
traces.
The optical contact point has open
circuit signal interference or
strong interference signal
intrusion.
1. Check if there is a strong interference
signal source; change the optical contact
point location if possible to avoid the
influence of the strong interference signal
source.
2. Check the cable lines of the optical contact
point, if there is shielding net or situation
that the RF connector shielding effect is not
good.
3. Tightly closed the equipment enclosure to
ensure the shielding effect; if possible add
shielding cover to the optical contact point
and reliable grounding.

WR-1004MLD Outdoor Optical Node Operation and Maintenance Manual
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After connecting the
network, the images of
several optical contact
points appear one or two
horizontal bright traces.
Power supply AC ripple
interference because of the bad
earth of equipment or power
supply.
Check grounding situation of the equipment,
make sure that every equipment in the line
has been reliably grounding and the
grounding resistance must be﹤4Ω.
After connecting the
network, the received
optical power of the
optical contact point is
unstable and changes
continuously. The
output RF signal is also
unstable. But the
detected optical output
power of the optical
transmitter is normal.
The optical fiber connector types
do not match, maybe the APC
type connect to PC type.
The optical fiber connector or
adapter may be polluted seriously
or the adapter has been damaged.
1. Check the type of optical fiber connector
and adopt the APC type optical fiber
connector to ensure the normal transmission
of optical signal.
2. Clean the polluted optical fiber connector
or adapter. Specific operation methods see
“Clean and maintenance method of the
optical fiber connector”.
3. Replace the damaged adapter.
10. Clean and maintenance method of the optical fiber active connector
In many times, we misjudge the decline of the optical power or the reduce of optical receiver
output level as the equipment faults, but actually it may be caused by the incorrect connection of the
optical fiber connector or the optical fiber connector has been polluted by the dust or dirt.
Now introduce some common clean and maintenance methods of the optical fiber active
connector.
1. Carefully pull off the optical fiber active connector from the adapter. The optical fiber active
connector should not aim at the human body or the naked eyes to avoid accidental injury.
2. Wash carefully with good quality lens wiping paper or medical degrease alcohol cotton. If use
the medical degrease alcohol cotton, still need to wait 1~2 minutes after wash, let the connector
surface dry in the air.
3. The cleaned optical fiber active connector should be connected to optical power meter to
measure output optical power to affirm whether it has been cleaned up.
4. When connect the cleaned optical fiber active connector back to adapter, should notice to make
the force appropriate to avoid the ceramic tube in the adapter crack.
5. If the output optical power is not normal after cleaning, should pull off the adapter and clean
the other connector. If the optical power still low after cleaning, the adapter may be polluted,
clean it. (Note: Be carefully when pull off the adapter to avoid hurting inside fiber.)
6. Use the dedicated compressed air or degrease alcohol cotton bar to clean the adapter. When use
the compressed air, the muzzle of the compressed air tank should aims at the ceramic tube of
the adapter, clean the ceramic tube with compressed air. When use degrease alcohol cotton bar,
carefully insert the alcohol cotton bar into the ceramic tube to clean. The insert direction should
be consistent, otherwise can not reach ideal cleaning effect.

WR-1004MLD Outdoor Optical Node Operation and Maintenance Manual
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11. After-sales Service Description
1. We promise: Free warranty for thirteen months (Leave factory time on product qualification
certificate as the start date). The extended warranty term based on the supply agreement.
We responsible for lifetime maintenance. If the equipment fault is resulted from the users’
improperly operation or unavoidable environment reasons, we will responsible maintenance
but ask suitable material cost.
2. When the equipment breaks down, immediately contact local distributor or directly call our
technical support hotline [phone].
3. The site maintenance of the fault equipment must be operated by professional technicians to
avoid worse damage.
Special notice: If the equipment has been maintained by users, we will not responsible free
maintenance. We will ask suitable maintenance cost and material cost.
Hangzhou Prevail Optoelectronic Equipment Co.,LTD.
Website：http://WWW.PREVAIL-CATV.COM