Softel SR1002S User manual

2013.
2013.5 5（ （Version Version 1 1） ）
SR1002S
Optical Receiver Manual

SR1002S
SR1002SSR1002SOptical OpticalOptical Receiver ReceiverReceiver Operation OperationOperation and andand Maintenance MaintenanceMaintenance Manual ManualManual
1. Product Summary
SR1002S optical receiver is our latest 1GHz FTTB optical receiver. With wide range receiving
optical power, high output level and low power consumption. It is an ideal equipment to build the
high-performance NGB network.
There are three models optional:
SR1002S/NC: The RFTV operating wavelength is 1100 ~ 1620nm.
SR1002S/WF: Built-in channel filter, the RFTV operating wavelength is 1550nm.
SR1002S/WD: Built-in CWDM, RFTV operating wavelength is 1550nm. Pass 1310/1490nm
wavelength. Can connect EPON, GPON and ONU.
2. Performance Characteristics
■Adopt advanced optical AGC control technique, the maximum AGC control range (adjustable)
is －9～＋2dBm;
■RF amplifier part adopts the high performance low power consumption GaAs chip, the highest
output level up to 114dBuv;
■EQ and ATT both use the professional electric control circuit, make the control more accurate,
operation more convenient;
■Built-in the Chinese standard II class network management responder, support remote network
management (optional);
■Compact structure, convenient installation, is the first choice equipment of FTTB CATV
network;
■External high reliability low power consumption power supply;
3. Technique Parameter
Item Unit Technical Parameters
Optical Parameters
Receiving Optical Power dBm -9 ~ +2
Optical Return Loss dB >45
Optical Receiving Wavelength nm 1100 ~ 1600 or 1530 ~ 1620
Optical Connector Type SC/APC
Fiber Type Single mode
Link Parameters
C/N dB ≥ 51
Note 1C/CTB dB ≥ 60
C/CSO dB ≥ 60
RF Parameters
Frequency Range MHz 45 ~862/1003
Flatness in Band dB ±0.75
Rated Output Level dBμV
108 (FZ110
configuration, with 8dB
tilt output)
104 (Two-way splitter,
with 8dB tilt output)
Max Output Level dBμV 114(-7 ~ +2 tap 110 (-7 ~ +2 two-way

SR1002S
SR1002SSR1002SOptical OpticalOptical Receiver ReceiverReceiver Operation OperationOperation and andand Maintenance MaintenanceMaintenance Manual ManualManual
configuration) splitter)
Output Return Loss dB ≥16
Output Impedance Ω 75
Electrical control EQ range dB 0～15
Electrical control ATT range dB 0～15
General Characteristics
Power Voltage V DC12V/1A
Operating Temperature ℃-40~60
Consumption VA ≤8
Dimension mm 142（L）* 79（W）* 36（H）
Note 1: Configure 59 PAL-D analog channel signals in the 550MHz frequency range. Transmit
digital signal in the frequency range of 550 ～862/1003MHz. The digital signal level (in 8 MHz
bandwidth) is 10dB lower than analog signal carrier level. When the input optical power of the
optical receiver is -1dBm, the output level: 108dBμV, EQ: 8dB.
4. Block Diagram
SR1002S/NC block diagram
SR1002S/WF block diagram
SR1002S/WD block diagram
Note: The circuit in the dashed box is optional configuration circuit.

SR1002S
SR1002SSR1002SOptical OpticalOptical Receiver ReceiverReceiver Operation OperationOperation and andand Maintenance MaintenanceMaintenance Manual ManualManual
5. Relation Table of Input Optical Power and CNR
6. Structure Specification
6.1 SR1002S/NC, SR1002S/WF
6.2 SR1002S/WD
No. Name Remark
1 DC12V power input
2RJ45 network
management interface
3 Optical signal input
4 RF output 1
5 RF output 2
No. Name Remark
1 DC12V power input
2RJ45 network
management interface
3 Optical signal input
4 Optical signal output
5 RF output 1
6 RF output 2

SR1002S
SR1002SSR1002SOptical OpticalOptical Receiver ReceiverReceiver Operation OperationOperation and andand Maintenance MaintenanceMaintenance Manual ManualManual
7. Function Display and Operating Instruction
Mode: Mode selection button, total eight modes. Press the mode selection button to enter the
corresponding status display, eight modes to cycle.
The following is the detailed instructions：

SR1002S
SR1002SSR1002SOptical OpticalOptical Receiver ReceiverReceiver Operation OperationOperation and andand Maintenance MaintenanceMaintenance Manual ManualManual
8. 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 input optical 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 input optical 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 input optical power of the
optical receiver is not enough, result
the decrease of C/N.
2. The optical fiber active connector
or adapter of the optical receiver has
been polluted.
3. The RF signal level input the
optical transmitter is too low, make
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. Recover the received optical 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
active connector”.
3. Check the RF signal level input the optical
transmitter and adjust to the required input
range. (When the input channels number less
than 15, should higher than 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 strong interference signal
source; change the optical contact point
location if possible to avoid the influence of
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.
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﹤4Ω.

SR1002S
SR1002SSR1002SOptical OpticalOptical Receiver ReceiverReceiver Operation OperationOperation and andand Maintenance MaintenanceMaintenance Manual ManualManual
After connecting the
network, the received
optical power of the optical
contact point is unstable
and has large continuous
change. The output RF
signal is unstable, too. But
the detected output optical
power of the optical
transmitter is normal.
The optical fiber active connector
types do not match, maybe the APC
type connect to PC type, make the
optical signal cannot normal
transmission.
The optical fiber active connector or
adapter may be polluted seriously or
the adapter has been damaged.
1. Check the type of optical fiber active
connector and adopt the APC type optical
fiber active connector to ensure the normal
transmission of optical signal.
2. Clean the polluted optical fiber active
connector or adapter. Specific operation
methods see “Clean and maintenance method
of the optical fiber active connector”.
3. Replace the damaged adapter.
9. 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 screw 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 screw 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 screw 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 screw 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.
10. 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

SR1002S
SR1002SSR1002SOptical OpticalOptical Receiver ReceiverReceiver Operation OperationOperation and andand Maintenance MaintenanceMaintenance Manual ManualManual
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.