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30 Engineering guidelines
Enterprise Edge 2.0 IP Telephony Configuration Guide P0911590 Issue 02
Program a script to run the Ping program during intranet’s peak hours, repeatedly
sending a series of 50 Ping requests. Each Ping request generates a summary of
packet loss (with a granularity of 2%), and for each successful probe that made its
roundtrip, that many rtt samples.
For a strong network there must be at least 3000 delay samples and 60 packet loss
samples. Have the raw output of the Ping results stored in a file. Determine the
average and standard deviation of one-way delay and packet loss.
Repeat this for each site pair. At the end of the measurements, the results are as
shown in Table 7.
Table 7 Delay and error statistics
Other measurement considerations
The Ping statistics described above measure the intranet before IP telephony
installation. The measurement does not take into consideration the expected load
provide by the IP telephony users.
If the intranet capacity is tight and the IP telephony traffic important, the installer
or administrator must consider making intranet measurements under load. Apply
load using traffic generator tools; the amount of load must match the IP telephony
offered traffic estimated in the Enterprise Edge VoIP Gateway bandwidth
engineering section on page 17.
Decision: does the intranet meet IP telephony QoS needs?
The end of the measurement and analysis is a good indicator if the corporate intranet
can deliver acceptable voice and fax services. The Expected QoS level column in
Table 7 indicates to the installer or administrator the QoS level for each site pair
with the data.
To provide voice and fax services over the intranet, keep the network within a Good
or Excellent QoS level at the Mean+σ operating area. Fax services must not travel
on routes that have “Fair” or “Poor” QoS levels.
Destination
pair
Measured one-way
delay (ms)
Measured packet loss
(%)
Expected QoS level
Mean Mean+
σ
Mean Mean+
σ
Mean Mean+
σ
Santa Clara
/Richardson
171 179 2 2.3 Good Good
Santa Clara
/Ottawa
Santa Clara
/Tokyo
Richardson/
Ottawa
Richardson/
Tokyo
Ottawa/Tokyo
- 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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