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ASCOM I62 Troubleshoot Manual
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Troubleshooting Guide
Ascom i62 VoWiFi Handset
TD 92685EN
28 June 2012 / Ver. A
2
Table of Contents
Default Chapter
2
About this Document
2
Table of Contents
3
1 Introduction
6
Target Group
6
Prerequisite
6
Material Needed
6
Software Version
7
Abbreviations and Glossary
7
Information Required by TAC
8
2 WLAN Overview
9
The Problem of Legacy Wlans
9
WLAN Planning and Provisioning
10
The Importance of Pre- and Post-Site Surveys
11
WLAN Dynamics
11
Troubleshooting Implications and WLAN Design
11
3 The Vowifi Handset as a Wireless Client
13
Vowifi Handset Protocol Layers
13
Troubleshooting the Layers
15
Voice Transmission over a Vowifi System
15
Handset Startup Procedure
15
AP Scanning
16
Active Scanning
16
Passive Scanning
16
Configured Channels and Scanning Intervals
16
Power Management
17
Overview
17
U-APSD PS Mode Operation
18
Recommended Values
20
Screen Saver
20
Roaming
20
Idle Mode
21
Call Mode
21
System-Aided Roaming
22
DFS Channel Probing
22
Sip
23
SIP Components
24
SIP Call Setup
26
Redirect Servers
29
Call Completion
29
Message Content
30
Ascom I62 Vowifi Handset TD 92685EN
30
Troubleshooting Implications
31
4 Factors Affecting RF Propagation
32
Jitter, Latency and Packet Loss
32
Signal Loss
32
Troubleshooting Methodology
33
Isolate Problem Areas
34
5 The Vowifi Handset as a Troubleshooting Tool
36
Handset Device Information
36
Site Survey Tool
36
Show RSSI
36
Creating Heatmaps
37
Evaluate the Radio Environment
37
Range Beep
38
Coverage and Roaming Test
38
The Admin Menu
39
Handset Web Interface
39
Logs Tab
39
Statistics Tab
39
Tools Tab
41
Quality of Service (Qos) Test
42
6 Troubleshooting Scenarios
43
Sip
43
Attended Transfer Example
43
PBX Basic Call Analysis
47
Identifying Problems
49
Name Presentation Problems
50
WLAN Troubleshooting Scenarios
50
Voice Problems While Roaming
50
7 Vowifi Handset Problem Solving Scenarios
53
Handset Errors
53
Startup Problems
53
Errors Displayed on the Handset
53
No Access
55
Messaging or Voice Only
56
No Channel
57
Battery Power Is Low
57
Connected Call but no Sound or One-Way Sound
58
U-APSD Troubleshooting
58
Determining if the AP Supports U-APSD
58
Determining if Handset Signals Its Use of U-APSD
59
Packet Classification of U-APSD in the AP
59
8 Related Documents
63
9 Document History
64
Appendix A: Making Air Traces of 802.11 Traffic
65
Appendix B: Handset Parameters
66
Appendix C: Digital Certificates
72
Appendix D: External Troubleshooting Tools
74
Appendix E: Ascom I62 Ports
77
Index
80
Other manuals for ASCOM I62
Quick Reference Guide
22 pages
Configuration Manual
79 pages
Product Sheet
2 pages
4
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ASCOM I62 Specifications
General
Display
2.4 inch QVGA
Connectivity
Wi-Fi, Bluetooth
Battery
Li-ion
Technology
GSM
Key features
Bluetooth, Wi-Fi
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