MINI-LINK TN TROUBLESHOOTING GUIDE
Hadi balharith
[email protected]
agenda Mini-link troubleshooting 1. 2. 3. 4.
TROUBLESHOOTING STEPS LINE OF SIGHT OUTDOOR INSTALLATION TROUBLESHOOTING TOOLS › › ›
5.
RF LOOP IF LOOP RF INTERFERENCE TEST
ALARMS/BEHAVIOUR ACTION PLAN › › › › › › › ›
FAR END NO CONTACT LOW MODULATION / ATPC NOT SYNC WITH RSL LAN DOWN RL-IME NO TRAFFIC WAN DOWN WAN LOWER LAYER DOWN HCC ALARM RCC ALAM
Mini-Link TN Troubleshooting Guide | Commercial in confidence | 2017-02-26 | Page 2
TROUBLESHOOTING STEPS 1. 2. 3. 4. 5. 6. 7.
Analysis. Problem replication/identification. Possible Faults with alarm messages Action Plan. Testing. Documentation. Follow Up.
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Check line Of Sight. Low RSL and fading sometimes due to the LOS
For Example
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Check antenna support and waveguide. When you facing Low rsl , check the support arm , it should be perpendicular
Wrong
Wrong right
Wrong Mini-Link TN Troubleshooting Guide | Commercial in confidence | 2017-02-26 | Page 5
agenda Mini-link troubleshooting
› RF LOOP › IF LOOP
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Rf loop test › Loops can be used to verify that the transmission system is working properly or they can be used to locate the faulty unit or interface in case of failure. › types of loops : 1. IF loop 2. RF loop 3. Rx loop
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Rf loop test › To make RF LOOP 1. Right Click on the desired radio link 2. Select Radio Link Loops
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RF LOOP TEST › For RF Loop , Click on RF box and the arrow color will change to blue › For IF Loop , Click on IF box and the arrow color will change to blue
RF Loop activated Mini-Link TN Troubleshooting Guide | Commercial in confidence | 2017-02-26 | Page 9
IF Loop activated
By setting the RF loop you can find out if the radio terminal is ok or not. When you have set a loop and the terminal is ok it should look like in the right hand example. There should be no alarms on the IF and RF level, but the HCC alarm on the modem will still be present. The input to the receiver (RX value) should be around -50 dBm ±10 dBm ( Rx= -60 to -40) . This is ok. Mini-Link TN Troubleshooting Guide | Commercial in confidence | 2017-02-26 | Page 10
If you get a lower value than the -50 dBm ±10 dBm the radio terminal can still be ok. But if the RF input level is below the threshold level for that modulation order you will still have a lot of alarms. This can be when high modulation orders are used. Try to set a lower modulation order to see if the alarms disappear. See the next slide for an example. Mini-Link TN Troubleshooting Guide | Commercial in confidence | 2017-02-26 | Page 11
Change to a lower modulation order and see what happens with the alarms. If all alarms disappear you know that the radio is ok, even if the received level is low. That is nothing that affects the radio in normal operation! Mini-Link TN Troubleshooting Guide | Commercial in confidence | 2017-02-26 | Page 12
IF loop test to check the MMU functionality .
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agenda Mini-link troubleshooting
› RF INTERFERENCE TEST
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Rf Interference
› In order to see if the ES / SES / UAT is a result of multipath fading and/or rain or a combination of fading and interference, the history of the input level needs to be examined. › If there has been ES / SES / UAT, but without the input level going below the receiver threshold, interference can be suspected. Mini-Link TN Troubleshooting Guide | Commercial in confidence | 2017-02-26 | Page 15
Maximum rf level @ tx off Channel spacing (MHz) 3.5 7 14 28 40 56
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RF input level (dBm) -94 -91 -88 -85 -82 -82
Interference test › Interference Test Procedure : › Interference measurement can be tested on 2 ways based on SBL Release as follow :
1. Spectrum Diagnostics Tools : Only if the TN SBL ≥ 5.4FP ( R32K123 ) with Mini-Link craft 16A or higher
2. Manual interference test The manual test can be used with any SBL and only recommended for SBL < 5.4FP
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Interference test › Interference Test Procedure : 1. Access the far-end terminal from MINI-LINK Craft and switch off the far-end transmitter. 2. Access the near-end terminal from MINI-LINK Craft and switch off the near-end transmitter. 3. For XPIC Links , Turn off both the V & H transmitter on the near end and far end › Note: › In a 1+1 system both transmitters must be switched off.
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Spectrum Diagnostics Tools 1. Under Radio Links , Right Click on the desired radio link 2. Select Spectrum diagnostics in new window
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Spectrum Diagnostics Tools 5. Select scan type = Channel Scan 6. Click Start Scan
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Spectrum Diagnostics Tools The scan result graph will show the interference test results . The left graph indicates no interference in the link since all the results is < -85 dBm for CS=28Mhz While the right graph shows high interference on the whole channel
No Interference
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High Interference
Spectrum Diagnostics Tools To get the interfere test report ; 1. Under Scan result , Choose Image , Click export 2. Also, Click CSV, Click Export
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Manual Interference test › Interference Test Procedure : 1. Access the far-end terminal from MINI-LINK Craft and switch off the far-end transmitter. 2. Access the near-end terminal from MINI-LINK Craft and switch off the near-end transmitter. 3. Measure the received RF input level for the operating center frequency. If the level exceeds the RF input level stated in below tables, consult the design department. 4. Repeat the measurement for all frequencies within the channel spacing in steps of 2 MHz. 5. Record the highest value on the Functional Test record. If any level exceeds the RF input level stated in the table below, consult the design department.
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Manual Interference test for 1+0 link › Test Interference Example : › 1+0 link, Tx = 23030 Mhz & channel spacing = 28 Mhz
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Manual Interference test for 1+0 link 1. Measure the received RF input level for the operating center frequency ( 23030). 2. Repeat the measurement for all frequencies within the channel spacing in steps of 2 MHz. 3. IF the Rx level < -85 dBm then the link suffer from Interference.
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Manual Interference test FOR XPIC 2+0 LINK › Test Interference Example 2 : › XPIC 2+0 link, Tx = 12877 Mhz & channel spacing = 28Mhz
1. 2. 3. 4. 5. 6.
Turn off both the V & H transmitter on the near end and far end At the radio link configuration page, select the frequency check on the Rx level for that Freq Record RSL level on the "Measure RSL" for both V & H and upper & lower channel Change another freq, and Repeat step 2 to 5 until the whole frequency is measured IF the Rx level < -85 dBm then the link suffer from Interference.
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Interference test FOR XPIC 2+0 ZRH705 V-Pol Slot 2 MHz from center frequency
MHz
ZRH705 H-Pol Slot 3 Measured Interferenece RSL Result
MHz from center frequency
MHz
Measured Interferenece RSL Result
12863
-80.2
Fail
12863
-90.3
Pass
12865
-79.8
Fail
12865
-90.5
Pass
12867
-79.4
Fail
12867
-90.5
Pass
12869
-79
Fail
12869
-90.6
Pass
12871
-79
Fail
12871
-90.8
Pass
12873
-78.7
Fail
12873
-91.2
Pass
12875
-79.1
Fail
12875
-91.1
Pass
Configured frequency 12877
-79
Fail
Configured frequency 12877
-91.8
Pass
12879
-79
Fail
12879
-91.8
Pass
12881
-79
Fail
12881
-91.8
Pass
12883
79
Fail
12883
-91.8
Pass
12885
-79
Fail
12885
-91.8
Pass
12887
79
Fail
12887
-91.8
Pass
12889
-81
Fail
12889
-91.8
Pass
12891
-89.6
Pass
12891
-91.8
Pass
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agenda Mini-link troubleshooting
5. ALARMS/BEHAVIOUR ACTION PLAN › FAR END NO CONTACT › LOW MODULATION / ATPC NOT SYNC WITH RSL › LAN DOWN › RL-IME NO TRAFFIC › WAN DOWN › WAN LOWER LAYER DOWN › HCC ALARM › RCC ALAM
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Far End No Contact
Checks
Actions
Frequency TX/RX
Correct frequency to be set
Channel spacing
Same channel spacing on both sides
Spectral Efficiency Class
Same class on both sides
Tx power
Set according to design docs
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LOW MODULATION / atpc not sync with rsl Checks
Actions
Check RSL
Check TX power If RSL not Ok , Then fine Tuning is Required
Check RAU software (R5A04) Check MMU software (R7D01) Check SBL software (R32K123)
Upgrade/downgrade should be planned
RAU/MMU RAU Functionality
MMU Functionality
RF Interference Mini-Link TN Troubleshooting Guide | Commercial in confidence | 2017-02-26
RAU/MMU Restart RF loop (verify if RAU is ok or not) expected received power ~ -40 and -60 dB IF loop (verify if MMU is ok or not) All Alarms should be cleared except HCC Also , The modulation should be cleared and if one end have lower modulation then replace MMU Perform full intereference Test for the whole channel spectrum. ( Refer to Interference Test Procesure) If interference found , Then E// TND team | Page 30 should provide new frequecny .
Low modulation troubleshooting ( MMU faulty case) › Example - Link is planned and configured 229Mbps with 256 QAM but in running state it is showing 128QAM. Because of Modulation dropped through put is coming less and link is running with error. › Troubleshooting Steps : 1. Give RF loopback at both ends. 2. If there is no error in RF loopback than give IF loop back. 3. No error. But at one end, IF loopback running on 128QAM So that means MMU is faulty
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Low modulation troubleshooting ( MMU faulty case) › IF loopback enabled at NE , The results states that the Modulation is lower than the planned one
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Low modulation troubleshooting ( MMU faulty case) › IF loopback enabled at FE , The results states that the Modulation is the same as the planned one
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Low modulation troubleshooting ( MMU faulty case) › So then we replace the MMU at NE Site where IF loopback running 128QAM. › After the replacing MMU link running at 256 QAM.
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Lan down Checks
Actions
Physical connection/cables
Cable OK, present and connected on other side
Admin Status
Set it "UP"
Parameters (Auto negotiation, Flow control, Speed)
Verify its identical in both sides
Check port Role in design (CN-UNI most of the times) LAN port belonging to ETU/NPU
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Restart board Warning TRAFFIC AFFECTING
RL-IME No traffic Checks
Actions
Related packet link and MMU are working properly
-
Far End WAN settings completed (RL-IME associated to packet link)
Complete configuration on Far-End Remove and re-config RL-IME in the same RL-IME
everithing seems ok
Remove and re-config RL-IME in a spare RL-IME
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WAN Down Checks
Actions
Check RL-IME is OK Check Switch port association and switch port status Check Port Role (I-NNI for WAN) Re-do all previous steps also on far end side everithing seems ok
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Reload Ethernet Switch
WAN lower layer down Checks
Actions
Cold Restart
Cold Restart the NE & FE Nodes Verify the Radio ID in Both Ends is correct and DCN Only Radio ID / DCN Only box is unchecked MMU & RAU SW Check MMU & RAU SW version compatibility with SBL Check TX power If RSL not Ok , Then fine Tuning is Check RSL Required Perform intereference Test for the whole channel spectrum RF Interference ( Refer to Interference Test Procesure) Frequency Check the Tx & Rx frequency is matched between NE - FE Check RAU connection and polarisation (ex: one site is V RAU connection and polarisation the other is H) or the XPIC cable is problematic
1- Change the MMU slot position , if nothing happened then PtP is clear NPU/PtP bus/MMU Functionality 2- Warm Restart the node , check if all the other RL-IMEs are up so the NPU is OK 3- Replace the MMU Mini-Link TN Troubleshooting Guide | Commercial in confidence | 2017-02-26 | Page 38
HCC alarm Checks
Actions
1- Make IF loop, if the alarm cleared so the MMU & IF cable is OK, If not cleared then replace MMU check the hop with the both loop 2- Make RF loop, if RF is not able to clear the alarm then IF & RF loop the RAU is faulty, if after giving RF loop the alarm cleared then this site is OK now check the far end with same loop's. check the SW Release Check Tx & Rx Frequencty RF Interference
upgrade to Latest SBL check frequencies and MMM IDs at both sides check interference at both sides Warm or Cold restart MMUs
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Rcc alarm
Checks
Actions
Check Outdoor Connectors
The most common cause of RCC alarm is the outdoor connector loose , check it properly then check the IF cable
RAU Functionality
RF loop (verify if RAU is ok or not) expected received power ~ -40 and -60 dB
MMU Functionality
IF loop (verify if MMU is ok or not) All Alarms should be cleared except HCC
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