Transcript Document 7339760

2012 MTSC
IW Presentation
2012 MTSC IW Presentation (Agenda)
 What’s new this year?
 Highlights of AWK Series
• High Throughput – 802.11n
• Auto Carriage Connection
• Controller-based roaming
 Highlights of OnCell Series
• HSPA - High Speed Packet Access
• GuaranLink
• Remote SMS
 General Diagnosis
• AWK Series
• Long Distance Antenna Alignment
• Throughput Diagnosis
• OnCell Series
• From Link Quality Report to GuaranLink?
• Tranceiver – for OnCell TCP/Client
 FAQ
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Confidential
What’s new this year
What’s new in the AWK Series?
New Products:
• AWK-3131/4131
• Wireless Access Controller WAC-1001
New Features:
• Auto Carriage Connection (CV)
• Controller-based Turbo Roaming (CV)
What’s new in the OnCell Series?
New Products:
• OnCell G3110/G3150-HSPA
• OnCell 5004/5104-HSPA
New Features
• GuaranLink on all OnCell G3000/5000 series
• Remote SMS on all OnCell G3000/5000 series
High Throughput – 802.11n
802.11n: What is 802.11n?
802.11n is an amendment released in 2009 which improves
upon the previous 802.11 (a/b/g) standards by introducing
several new technologies. 802.11n operates on both the
2.4 GHz and 5 GHz bands.
Model:
• AWK-3131/4131 (Released)
• AWK-5232/6232 (Coming Soon)
Highlight:
• Throughput improvement
802.11n: Throughput Improvement
200
150
100
AWK-X131
AWK-X121
80 Mbps
50
0
140 Mbps
6 Mbps
802.11b
25 Mbps
802.11ag
802.11n
20MHz
802.11n
40MHz
Note: 802.11n performances are based on 2 Spatial Steams
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Confidential
802.11n: Technology Overview
802.11a/g
802.11n
MAC Level
Optimization
MAC Level
Optimization
Short Guard Interval
Short Guard Interval
More efficient OFDM
More efficient OFDM
Around2 Spatial StreamsAround
70 - 80 Bonding
Mbps Around 70 –40MHz
80 Mbps
Channel
140 Mbps
40MHz
Channel Width
802.11a/g OFDM
802.11n OFDM
802.11n OFDM
25Mbps
25Mbps
25Mbps
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Confidential
802.11n: Channel Bonding
Note: useable channels are locally defined – check required
802.11n: Multi-Input Multu-Output (MIMO)
One Spatial Stream
AWK-X131 Support
2x2
AWK-4121
802.11n: Case Study
AWK-4131
AWK-4121
AWK-4121
Switch
5Mbps x 4 = 20Mbps
AWK-4121
AWK-4131
Control Center
Building 1
Auto Carriage Connection (ACC)
ACC: Carriage to Carriage Communication
Data
14
Data
Confidential
Data
ACC: Carriage to Carriage Connection
This can already be achieved via WDS, but with the
following draw backs:
-
Manual configurations are needed whenever rearrange the carriages.
-
Weak transmission security – WDS only supports
Open and WEP security
WDS
ACC: What is Auto Carriage Connection?
Moxa’s answer to inter-carriage connection:
Automation - Simple Yet Secure
Model:
• AWK-3131 (CV Release)
• AWK-5222 (CV Release)
Highlights:
• No manual configuration is required after the initial setup
• Stronger security modes
Antenna requirement:
• Low gain
• Directional
ACC Configuration Parameters
 ACA/ACD RSSI Thresholds (dBm)
• Above threshold – Connection candidate
• Below threshold – Start disconnection count down
 ACA Link Timeout (60 – 180 seconds)
• Best connection candidate + Link Timeout = Connect
• Below threshold + Link Timeout = Disconnect
 ACA Negotiation Timeout (1 – 180 seconds)
• The maximum time for two ACC devices to establish their
connection
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Confidential
ACC: How does it work?
11
32
Approaching
Departing
Approaching
22
1. Signal
Signal Strength
Strength between
between both
both carriages
carriages exceeds
drops
below
the Threshold
ACD
Threshold
1.
exceeds
the
the ACA
ACA
Threshold
2. Stabilizing
Disconnection
count down(ACA
(ACALink
LinkTimeout
Timeoutcountdown)
countdown)
2.
Stabilizing the
the connection
connection
(ACA
Link
Timeout
countdown)
3
3.
Disconnected
3. Establishing
Establishing the
the connection
connection (ACA
(ACA Negotiation
Negotiation Timeout
Timeout countdown)
countdown)
4.
4. Connection
Connection Established
Established
Controller-Based Roaming
What is Controller-Based Roaming?
Having an Access Controller to handle the roaming decisions
based on Client’s RSSI as seen from the monitored APs
Model:
•
•
WAC-1001 (CV Release)
AWK-3121/4121 (CV Release)
Highlights:
•
•
•
•
•
•
Roaming domain support
Flexible roaming configuration
Strong security - WPA/WPA2
Single-channel and Multi-SSID supporting
Inter WAC and Redundant WAC
Fast roaming time
Controller-Based Roaming - 1
Connected
WAC-1001 Roaming Action
Current Link > Threshold High
No Roaming Test
Client
-88dBm
-45dBm
AP1
AP2
Switch
Survey
Controller-Based Roaming - 2
Connected
Client
-60dBm
AP1
-75dBm
Survey
WAC-1001 Roaming Action
(AP2-Client
Current
Link- <Current
Threshold
Link)High
< Difference
No Roaming
Roaming
Test Start
AP2
Switch
Controller-Based Roaming - 3
Connected
Client
-75dBm
AP1
-60dBm
Survey
WAC-1001 Roaming Action
Current Link- <Current
(AP2-Client
Threshold
Link)High
> Difference
Roaming to
Test
AP2
Start
AP2
Switch
HSPA (High Speed Packet Access)
What is HSPA?
High Speed Packet Access (HSPA) is an amalgamation of two
mobile telephony protocols, High Speed Downlink Packet
Access (HSDPA) and High Speed Uplink Packet Access (HSUPA)
Model:
• OnCell G3000/5000-HSPA series
Highlight:
• Throughout improvement
Confidential
HSPA: Throughput Improvement
HSDPA – High Speed Downlink Packet Access
HSDPA – High Speed Uplink Packet Access
OnCell G3000/5000-HSPA
Downlink: Release 5 Category 10 – 14.0Mbps
Uplink: Category 6 – 5.76Mbps
Confidential
GuaranLink
What is GuaranLink?
GuaranLink is an OnCell feature that ensures the connection is
always on by monitoring and recovering from any unexpected
disconnection.
Model:
• OnCell G3000/5000 series
Highlight:
• Connection Monitoring
• Connection Recovery
Confidential
Three ways to check cellular connection
 ISP initial connection check
•
Check if OnCell can not registered to GSM network (check
PPP connection), then reboot OnCell
• Set PPP retry count (per 3min)
• Set network registration timeout (10~600min)
X
PPP fails
Cellular ISP
Confidential
Three ways to check cellular connection
 Cellular connection alive check
• Check if there is any data flow( PPP Rx count), if not, check if
connection is alive(DNS look up and PING host) then
reconnect to GPRS
• Set cellular connection alive check interval (1~600min)
• Set cellular connection alive check retry count (1~5/15sec)
X
Ping & DNS
1234
X
Packet Rx
Counter
GPRS Cellular network
Three ways to check cellular connection
 Packet-level connection check
• Periodically ping remote host to check if the connection is
still alive or not, then reconnect to GPRS.
• Set Packet-level connection check interval (1~600min)
• Set Packet-level connection check retry count (1~5/15 sec)
Ping & DNS
X
GPRS Cellular network
Confidential
When to use GuaranLink
 ISP initial connection check
• If sometimes OnCell cannot connect to GSM after boot up.
• Introduces no additional data traffic
 Cellular connection check
• If sometimes after OnCell is idle for a while, the GPRS
connection is dropped by ISP.
• Introduces ping traffic when DNS check fails
 Packet-level connection check
• If ISP disconnects the OnCell at random times.
• Introduces ping traffic periodically
Confidential
Remote SMS
What is Remote SMS?
Remote SMS is an OnCell feature that allows remote device
control and remote device status report via Short Message
Service(SMS)
Model:
• OnCell G3000/5000 Series
Highlights:
• Remote device reboot via SMS
• Status report to SMS
Remote SMS
Reboot Device and Report Cellular Status
SMS Service
General Diagnosis
AWK Series
Long Distance Antenna Alignment
 Make sure the line of sight between two points is clear
 Locate both locations on a map (For example, Google map)
 Use Compass to determine the direction
 Use GPS to determine altitude and adjust the vertical angle
 Optimize AWK configuration for long distance transmission
•
•
•
•
Disable Noise Protection
Enable Transmission Enhancement
Set Transmission Distance
Fix Antenna Output (to main)
 Use Site Survey to determine the signal strength
Long Distance Antenna Alignment
5km testing site
10km testing site
Connection Diagnosis
 Check the Overview page to make sure the connection is
established
• Make sure the Channel, SSID and Security setting are correct
 Using Ping to make sure the data is transmitted between AP
and Client
• Make sure the filters are not blocking the packets
 Check the Signal Strength to confirm the link quality
• Make sure the antenna polarity is correct
• Make sure the antenna alignment is correct
 Use IPerf to determine the throughput performance
• Make sure the channel is clean
• Check the data traffic on the current channel
General Diagnosis
OnCell Series
From Link Quality Report to GuaranLink
 Link Quality Report
• This is a feature prior to GuaranLink that makes sure the
connection to the internet stays connected
• It pings some public servers to make sure the connection
stays
• If the connection does not exist, the device will reboot
• It is essential to be enabled if there is no GuaranLink
• In a private APN, this feature should be turned off as the
device will not be able to reach the testing public servers
 GuaranLink
• This is more advance than the Link Quality Report
• If GuaranLink is enabled, you can disable the LQR
FAQ
Why isn’t my AWK-3131 giving me the high
throughput introduced here?
 In the current spec, we do not support long
distance transmission. The suggested
distance is 200-300 meters
 Antenna Polarity is extreme important for
Multiple Spatial Streams, make sure they
don’t interfere with each other
 Make sure the channel you are using is clean
Why do we have poor video quality even
after we increase the multi-cast rate?
“Packet loss” is a limitation (or a nature) of the multicast mechanism
over wireless. Multicast over a wireless connection does not have any
retry procedures therefore when a packet is lost (by either collision or
signal corruption), it is lost.
The packet is lost between the wireless AP and Client because:
• Wireless connection is not as solid as Ethernet. We cannot guarantee the
packets get transferred 100%.
• Multicast does not have retry procedure. Therefore if the packet doesn’t
get through, it just doesn’t get through. The AP will not even try resending it again.
Ethernet
Wireless
Multicast
No layer2 retry
No layer2 retry
Unicast
No layer2 retry
Layer2 retry
Should I keep my arrest closer to my
device?
 Having the arrester closer to antenna is better than
having arrester close to the device.
• When you attach the arrester to the device, depend on the
earthing condition and setup, there is a possibility for the
surge to jump straight onto the device (since the device is
made of metal) and damage it.
• When you attach the arrester to the antenna, there is also a
possibility for the lighting to strike on the cable. However,
since antenna is usually the highest point and RF cables are
wrapped with plastic, this scenario is much less likely to
happen than the first scenario.
Under AWK AP-Client mode AP doesn’t report
End Devices’ MAC address correctly. (1/2)
Conventional AP-Client Usage
AP
End Devices
End Devices
Unconventional AP-Client Usage
AP
Client
End Devices
End Devices
AP has the End Devices MAC address
AP has the Client’s MAC address, but it
doesn’t know the End Devices’ MAC.
AP is relying on Client to perform the
ARP resolution so packets can be
delivered to the End Devices
Under AWK AP-Client mode AP doesn’t report
End Devices’ MAC address correctly. (2/2)
Moxa’s Wireless Bridge Solution
Master
Slave
End Devices
End Devices
End Devices
With the Wireless Bridge mode, the MAC address will be maintained during the
wireless transmission.
That means the controller PC will have the correct MAC address for the targeted
end device.
How can I speed up the troubleshooting
process?
Prepare sufficient information
•
•
•
•
•
•
Topology and Client Application
Model Name/Hardware Version
FW Release
Exports Configuration Files
System Logs
Duplicate method if possible