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28 Engineering guidelines
Enterprise Edge 2.0 IP Telephony Configuration Guide P0911590 Issue 02
The file can be analyzed by the administrator using spreadsheet and other statistics
packages. The installer can check if the intranet’s network management software
has any delay measurement modules which can cause a delay distribution
measurement for specific site pairs.
Delay characteristics vary depending on the site pair and the time of day. The
evaluation of the intranet includes taking delay measurements for each site pair. If
there are important changes of traffic in the intranet, include some Ping samples
during the intranet’s peak hour. For a more complete evaluation of the intranet’s
delay characteristics, get Ping measurements over a period of at least a week.
Measuring end-to-end packet loss
The Ping program also reports if the packet made its round trip correctly or not. Use
the same Ping host setup to measure end-to-end errors. Use the same packet size.
Sampling error rate, require taking multiple Ping samples (at least 30). An accurate
error distribution requires data collection over a greater period of time. The error
rate statistic from multiple Ping samples is the packet loss rate.
Recording routes
As part of the network evaluation, record routing information for all source
destination pairs. Use the Traceroute tool to record routing information. A sample
of the output of the Traceroute tool follows:
C:\WINDOWS>tracert 10.10.10.15
Tracing route to 10.10.10.15 over a maximum of 30 hops:
1 3 ms 1 ms <10 ms tftzraf1.ca.nortel.com [10.10.10.1]
2 1 ms 1 ms 1 ms 10.10.10.57
3 7 ms 2 ms 3 ms tcarrbf0.ca.nortel.com [10.10.10.2]
4 8 ms 7 ms 5 ms bcarha56.ca.nortel.com [10.10.10.15]
Trace complete.
The Traceroute program checks if routing in the intranet is symmetric or not for
each source destination pairs. Also, the Traceroute program identifies the intranet
links used to carry voice traffic. For example, if Traceroute of four site pairs gets
the results shown Table 5, you can calculate the load of voice traffic per link.
Table 5 Site pairs and routes
Site pair Intranet route
Santa Clara/Richardson R1-R4-R5-R6
Santa Clara/Ottawa R1-R2
Santa Clara/Tokyo R1-R4-R5-R7
Richardson/Ottawa R2-R3-R5-R6
- Enterprise Edge 2.0 1
- IP Telephony 1
- Configuration Guide 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- Overview 7
- About this document 8
- System Functions 8
- Dialing plan support 9
- Network Quality of Service 10
- Overview 11 11
- Network Performance Utilities 12
- Silence compression 13
- Echo cancellation 13
- Fax calls 14
- Alarm Notification 14
- Jitter buffer 14
- Engineering guidelines 15
- 16 Engineering guidelines 16
- Engineering guidelines 17 17
- Multiple network interfaces 18
- Method 1 19
- Method 2 19
- LAN engineering 20
- WAN engineering 22
- Link utilization 23
- 24 Engineering guidelines 24
- Setting QoS 26
- Measuring Intranet QoS 27
- Recording routes 28
- Adjusting ping measurements 29
- Measurement procedure 29
- Further network analysis 31
- Reduce link delay 32
- Reducing hop count 32
- Engineering guidelines 33 33
- Routing issues 34
- Traffic mix 35
- TCP traffic behavior 35
- Implementing the network 36
- IP telephony settings 37
- Engineering guidelines 39 39
- Figure 5 Silence compression 39
- Fallback threshold 42
- Dialing plan 43
- 44 Engineering guidelines 44
- Engineering guidelines 47 47
- 48 Engineering guidelines 48
- Figure 8 Toll bypass 48
- Setting 49
- 52 Engineering guidelines 52
- Intranet QoS monitoring 53
- User feedback 54
- Engineering checklist 55
- 56 Engineering checklist 56
- Installation 57
- Configuring a remote gateway 58
- Installation 59 59
- 60 Installation 60
- Configuration 61
- User Interface Overview 62
- Local Gateway Configuration 63
- Remote Gateway Configuration 65
- Configuration 67 67
- 68 Configuration 68
- Maintenance 69
- 70 Maintenance 70
- Interoperability 71
- No feedback busy station 72
- Glossary 73
- 76 Index 76
- Voice Jitter Buffer 76
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