WMAX Troubleshooting Guide_070902
Transcript of WMAX Troubleshooting Guide_070902
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WMAX
Troubleshooting Guide
SW Version 2.5September 2007P/N 214693
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ii WMAX Troubleshooting Guide
Document History
Docum ent H is to r y
No. Topic Description Date Issued
1 General This is the first release of this guide. SW Version 2.0,
February 2006
2 Rates vs. SNR Table Section 8 Modulation and Coding column
updated
SW Version 2.0, Rev. B,
March 2006
3 General Format Update SW Version 2.5,
June 2006
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Contents
1 SU Ethernet Port Connect ion Problem (No Telnet) . .. .. .. .. .. .. .. .. .. .. .1
2 NPU Data Por t Connec t ion Prob lem (No Management ) . ..... .... ..... .2
3 TRAPs Sending Proble m ................................................................ 3
4 SU Asso c iat ion Proble m ................................................................ 3
5 SU Data Connec t ivi t y Proble m ...................................................... 4
6 Dow nli nk Tra ffi c Proble m ..............................................................6
7 Upli nk Tra ffi c Proble m ................................................................... 8
8 Rat e v s. SN R Ta bl e ...................................................................... 11
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SU Ethernet Port Connection Problem (No Telnet)
WMAX Troubleshooting Guide 1
1 SU Et hernet Por t Connec t ionProblem (No Telnet )Problem and Indication Possible Cause Corrective Action
The Ethernet Integrity
Indicator (the yellow LED
embedded in the Ethernet
connector) is off, and/or the
Ethernet Activity Indicator
(the green embedded LED)
does not blink when there
should be traffic on the
Ethernet port.
Wrong type of Ethernet
cable
If connected directly to PC-use a straight cable.
Otherwise-use a crossed cable.
Faulty Ethernet cable Replace cable
IDU-ODU cable problem. Verify that the IDU-ODU cable is in order and
connected properly. Using SAU, verify that PWR
LED is on and ALRM LED is off.
The Ethernet Activity and/or
Integrity LEDs are on, but
no Telnet access and the
unit does not respond to
ping.
Wrong IP configuration Make sure that the PC is on the same subnet as the
unit. The unit's IP address for management
purposes is 192.168.254.251, and the subnet mask
is 255.255.255.0.
Wrong Ethernet port
operation mode
Make sure that the speed and duplex settings in the
PC match the configuration in the unit. The default
operation mode is Auto Negotiation, and supported
speeds are 10/100 Mbps, Full or Half Duplex.
ARP table in the PC
contains a wrong MAC
address for the
192.168.254.251 IP
address (due to a recent
connection to another SU).
Perform arpV-d at the DOS command prompt to
clear the ARP table, and retry the Telnet command
to the unit.
Bridging table in SU is full
(expected when Number of
Supported Devices,
configurable from the Base
station's side, is set to a
small number.
Reset the SU to clear the table and retry the Telnet
command to the unit.
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Troubleshooting
2 NPU Dat a Por t Connec t ion Problem(No Managem ent )Problem and Indication Possible Cause Corrective Action
No NPU Management
Connection
Troubleshoot via the
Monitor program, using the
MON Serial port)
Assumptions:
Management should be
done via the Data port (In
Band) ONLY
1 Verify that the Management port is
disconnected. Verify that the IP address of the
Management port is other than 0.0.0.0.
2 Check the IP parameters of Data port and try to
ping it. The default IP address is 1.1.1.3 with
subnet mask 255.255.255.0.
3 Verify that the Data Port Management Traffic
parameter is Enabled.
4 Verify that the Data Port Status is Up. If not,
check that the Ethernet cable is straight/crossed,
according to the connected equipment: Crossed
when connected directly to a PC, straight
otherwise.
5 Verify that the Data Port Speed (100 Mbps or 1
Gbps) is compatible with the equipment
connected.
6 Verify that the Data Port Management VLAN ID
matches the Management VLAN ID of theconnected equipment. The default is None (No
VLAN).
7 When working in SNMP, verify that the IP
address of the device connecting to the
management system is configured as an
Authorized Manager, and that the Read/Write
communities configured in the Authorized
Manager entry complies with the community
strings used by the connected device.
8 If connecting from a different subnet, verify that
the Management Port Dest Subnet andManagement Port Dest Subnet Mask are
defined correctly (to ensure that the reply is
routed through the Data port and does not go out
through the Management port).
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TRAPs Sending Problem
WMAX Troubleshooting Guide 3
3 TRAPs Sending Problem
4 SU Assoc ia t ion Problem
Problem and Indication Possible Cause Corrective Action
No Traps (Management is
OK)
Configuration problem Verify that the Send Traps parameter in the
Authorized Manager entry for the managing device
is set to Enable.
Verify that the Admin Status of relevant traps in the
Trap Configuration menu is set to Enable.
If connecting from a different subnet, verify that the
Management Port Dest Subnet and Management
Port Dest Subnet Mask are defined correctly (to
ensure that the reply is routed through the Data portand does not go out through the Management port).
Problem and Indication Possible Cause Corrective Action
No Association - No Link
(WLNK LED in SAU is off)
Assumptions:
The Base Station, including
the applicable AU, is up and
running properly.
At least 1 SU is associated
with the applicable AU.
The SU, AU and NPU use
the latest SW version.
No power to the SU-IDU 1 Check that the power cable is connected.
2 Verify proper output power on the power cable
connector.
3 Replace power cable.
SU-ODU is disconnected 1 Verify that the IDU-ODU cable is connected.
2 Using SAU, check that the PWR LED is on and
that the ALRM LED is off.
Wrong configuration at SU
side
1 Open a Telnet session to the SU. Verify that the
unit is connected.
2 Verify that the unit's configuration matches the
AU configuration: Frequency, Bandwidth, Base
Station ID parameters.
The antenna bearing is not
optimal.
Slowly align the antenna towards the Base Station
while checking the SAU's LINK Bar LEDs.
Severe NLOS conditions. Check that the location of the SU is according to the
radio planning.
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Troubleshooting
5 SU Dat a Connec t iv i t y ProblemProblem and Indication Possible Cause Corrective Action
No Data Connectivity
Assumptions:
Link with the Base Station
has been established.
User's data equipment
connectivity is OK.
Base Station is up and
running properly, at leastone SU receives data.
Bridging table in SU is full
(expected when Number of
Supported Devices,
configurable from the Base
station's side, is set to a
small number.
Reset the SU to clear the table and retry the Telnet
command to the unit.
SU Status Configuration
problem
1 Ping the ISP's Local IP/Default Gateway.
2 In the Base Station, find the SU according to its
MAC address and check that the Registration
Status of the SU is "In Service".
3 Check that the Service Fault Status of the SU is
OK. Otherwise, refer to SU Service Fault
reasons below.
4 Check the Status of the SU:
a SU is Temporary and the Base station
Service Mode is Advanced: the SU will not
receive services. Change the SU Status to
Permanent and configure services.
b SU is Temporary and the Base station
Service Mode is Quick: Check that the
applicable Default L2/PPPoE Service is
configured (in the Services menu).
c SU is Permanent: check that a service is
configured for the SU's MAC address (in theServices menu).
Filtering configuration
problem
1 Verify that the MAC Address of the data
equipment is not included in the MAC Address
Deny List.
2 Verify that traffic to/from the data equipment is
not rejected due to any of the active filtering
rules.
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SU Data Connectivity Problem
WMAX Troubleshooting Guide 5
Service Configuration
Problem
Check proper Service configuration:
1 Verify that the Admin Status of the Service is
Enabled.
2 Verify that the Admin Status of the Subscriber is
Enabled.
3 Verify that Operation Status is Up. If Down, the
SU may not be associated (refer to the "SU
Association Problem" above).
4 Make sure that the traffic you forward from the
equipment connected to the SU is with the
appropriate VLAN, matching the Service's
definitions for VLAN List and Hybrid VLAN
Mode.
Service Profile
configuration problem
1 Verify that the equipment connected to the Data
port of the Base Station supports the configured
VPL ID (if VLAN Transparency Mode is Off) or
the VLAN ID used by the equipment connected
to the SU (if VLAN Transparency Mode is On).
2 Check the Service Type - if configured as
PPPoE, make sure you are sending PPPoE
packets only.
Forwarding Rule
configuration problem
Check the "Unknown Forwarding Policy"
configuration; if configured to "Reject", run Uplink
traffic (SU to Base Station) before running Downlink
Traffic (in order to update the Base station's bridging
table (addresses behind the SU).
Priority Classifier
configuration problem
Verify that the traffic from the user's data equipment
to the SU is with the correct priority marking as
defined in the Priority Classifier: 802.1p (VLAN
Traffic only) or DSCP (packets containing DSCP).
If more than one Uplink/Downlink Upper Range is
defined, packets must carry either 802.1p or DSCP
marking. Verify that the equipment behind the SUsupports the correct marking.
QoS Starvation problem Check the QoS configured for the Service. If a low
QoS (BE or NRT) is configured, the cell might be
overloaded with higher priority traffic. For testing
purposes, reconfigure a QoS with higher priority,
such as RT with CIR=12,000 Kbps, and repeat the
test.
Service Fault Status
indicates a Loop problem
A loop was detected on the
Ethernet side of the SU.
Correct the loop problem and reset the SU from the
Base Station's side.
Problem and Indication Possible Cause Corrective Action
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Troubleshooting
6 Dow nl ink Traf f ic Prob lemService Fault Status
indicates Duplicate SU
Name problem.
The Name configured in the
SU is already in use by
another SU.
Configure a new, unique name for the SU and reset
it.
Problem and Indication Possible Cause Corrective Action
High SNR, Low Rate in
Downlink (SU)
Check the Downlink SNR
and Rate of the SU. TheRate is lower than expected
according to the Rate
vs.SNR table (below)
Multirate algorithm has not
stabilized yet
Run downlink traffic via the unit for approximately 5
minutes and recheck the rate.
Installation problem Verify proper installation (including antenna
alignment and distance from objects that may affectlink quality) and when the installation is stable reset
the SU, run downlink traffic for 5 minutes and
recheck the rate.
In addition to the Rate
being lower than expected,
the Burst Error Rate at the
expected Rate is too high.
Interference Due to interference the SU cannot reach the
expected rate. Try to identify source of interference.
If feasible, try a different frequency (AU).
Check for interferences using a spectrum analyzer.
Check the radio planning.
The Burst Error Rate at the
expected Rate is low.
SU-ODU problem Replace the SU-ODU and recheck.
The problem exists also in
neighboring SUs, a single
ODU is connected to the
AU.
AU problem or high
interference
1 Check the LEDs of the AU-ODU and
AU-IDU/Micro Base Station.
2 Try to use the second Channel: If the problem
remains, replace the ODU. If the problem still
exists, replace the IDU.
If the problem disappeared after switching to the
second channel, the problem is in the channel. It
is recommended to replace the IDU.
3 If feasible, try a different frequency.
4 Check for interferences using a spectrum
analyzer.
5 Check the radio planning.
Problem and Indication Possible Cause Corrective Action
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Downlink Traffic Problem
WMAX Troubleshooting Guide 7
The problem exists also in
neighboring SUs, two
ODUs are connected to the
AU/Micro Base Station and
the problem occurs only in
SUs served by one of the
ODUs.
IDU or ODU problem, or
high interference
Check the LEDs of the AU-ODU and AU-IDU/Micro
Base Station.
If feasible, try a different frequency.
Try to switch between the two ODUs (to identify a
possible problem in one of the channels). If the
same ODU remains problematic, replace the ODU.
If the problem is identified in the channel (exists now
in the SUs served by the other ODU) - replace the
AU-IDU.
Check for interferences using a spectrum analyzer.
Check the radio planning.
The problem exists also in
neighboring SUs, two
ODUs are connected to the
AU/Micro Base Station and
the problem occurs in SUs
served by both ODUs..
AU-IDU/Micro Base Station
problem or high
interference on both
channels.
Check the LEDs of the AU-ODUs and AU-IDU/Micro
Base Station.
Replace the AU-IDU/Micro Base Station.
Check for interferences using a spectrum analyzer.
Check the radio planning.
Problem and Indication Possible Cause Corrective Action
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Troubleshooting
7 Upl ink Traf f ic ProblemProblem and Indication Possible Cause Corrective Action
High SNR, Low Rate in
Uplink (SU)
Check the Uplink SNR and
Rate of the SU. The Rate is
lower than expected
according to the Rate
vs.SNR table (below).
Problem occurs in all SUs
served by the AU/Micro
Base station, the AU/Micro
Base station is connected
to a single ODU.
AU/Micro Base Station (IDU
or ODU) malfunction or
strong interference
1 Reset the AU and check the rate.
2 Verify (via counters) that uplink traffic runs
through the AU.
3 If the Burst Error Rate at the expected rate is
low, try to use the other channel. If the problem
remains, replace the ODU and recheck. If the
problem does not exist any more, the problem is
in the Channel. It is recommended to replace the
AU-IDU/Micro Base Station.
4 If the Burst Error Rate at the expected Rate is
too high:
a Perform Spectrum measurements with the
ODU disconnected and check for
interferences on the Channel's frequency.
b Change the Channel's and SU frequencies
(this can be done for a number of SUs only)
and check the rate. Note: select an available
frequency as distant as possible from the
original frequency. If the rate has improved,
check the radio planning.
c Synchronize the SU to the AU/Micro Base
station and recheck the rate.
d Perform Spectrum measurements on the
Channel's new frequency. If no interferences
are exhibited, replace the ODU and recheck.
If the problem did not disappear, replace the
IDU and recheck.
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Uplink Traffic Problem
WMAX Troubleshooting Guide 9
Problem occurs in all SUs
served by the ODU. The
AU/Micro Base Station is
connected to two ODUs,
the problem occurs only in
SUs served by one of the
ODUs.
AU/Micro Base Station (IDU
or ODU) malfunction or
strong interference
1 Reset the AU/Micro Base Station and check the
rate.
2 Verify (via counters) that uplink traffic runs
through the AU/Micro Base Station.
3 If the Burst Error Rate at the expected rate is
low, try to switch between the channels. If the
problem remains in the SUs served by the same
ODU, replace the ODU and recheck. If the
problem exists now in SUs served by the other
ODU, the problem is in the Channel. Replace the
AU-IDU/Micro Base Station and recheck.
4 If the Burst Error Rate at the expected Rate is
too high:
a Perform Spectrum measurements with the
ODU disconnected and check for
interferences on the Channel's frequency.
b Change the Channel and SU frequencies
(this can be done for a number of SUs only)
and check the rate. Note: select an available
frequency as distant as possible from the
original frequency. If the rate has improved,
check the radio planning.
c Synchronize the SU to the AU/Micro Base
Station and check the rate.
d Perform Spectrum measurements on the
Channel's new frequency. If no interferences
are exhibited, replace the ODU and recheck.
If the problem did not disappear, replace the
IDU and recheck.
Problem and Indication Possible Cause Corrective Action
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10 WMAX Troubleshooting Guide
Troubleshooting
The problem exists in all
SUs served by the
AU/Micro Base Station, two
ODUs are connected to the
AU/Micro Base Station and
the problem occurs in SUs
served by both ODUs..
AU-IDU/Micro Base Station
problem or high
interference on both
channels.
1 Reset the AU/Micro Base Station and check the
rate.
2 Verify (via counters) that uplink traffic runs
through the AU/Micro Base Station.
3 If the Burst Error Rate at the expected rate is
low, replace the AU-IDU/Micro Base Station and
recheck.
4 If the Burst Error Rate at the expected Rate is
too high:
a Perform Spectrum measurements with the
ODUs disconnected and check for
interferences on the Channel's frequencies.
b Change the Channels and SUs frequencies
(this can be done for a number of SUs only
for each sector) and check the rate. Note:
select aavailable frequencies as distant as
possible from the original frequencies. If the
rate has improved, check the radio planning.
c Synchronize the SU to the AU/Micro Base
Station and check the rate.
d Perform Spectrum measurements on theChannels' new frequencies. If no
interferences are exhibited, replace the IDU
and recheck.
Problem occurs in a single
SU
Multirate algorithm has not
stabilized yet
Run downlink traffic via the unit for approximately 5
minutes and recheck the rate.
Installation problem Verify proper installation (including antenna
alignment and distance from objects that may affect
link quality) and when the installation is stable reset
the SU, run downlink traffic for 5 minutes and
recheck the rate.
In addition to the Rate
being lower than expected,
the Burst Error Rate at the
expected Rate is too high.
Interference Due to interference the SU cannot reach the
expected rate. Try to identify source of interference.
If feasible, try a different frequency.
Check for interferences using a spectrum analyzer.
Check the radio planning.
The Burst Error Rate at the
expected Rate is low.
SU-ODU problem Replace the SU-ODU and recheck.
Problem and Indication Possible Cause Corrective Action
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Rate vs. SNR Table
WMAX Troubleshooting Guide 11
8 Rat e vs. SNR TableRate Modulation & Coding Minimum SNR (dB)
1 BPSK 1/2 3.3
2 BPSK 3/4 5.5
3 QPSK 1/2 6.5
4 QPSK 3/4 8.9
5 QAM16 1/2 12.2
6 QAM16 3/4 15
7 QAM64 2/3 19.8
8 QAM64 3/4 21
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