Engineering Guidelines
224
MAINTAINING AVAILABILITY OF CONNECTIONS
The quality of service for signalling measures how long a user needs to wait before a service
becomes available, or whether the user becomes blocked from using a function. For example,
delays in receiving dial tone, or blocking that occurs if there are insufficient PSTN trunks degrade
the quality of service.
Quality of service can be ensured by proper provisioning. The sections below provide more
information on traffic guidelines and bandwidth calculations, and IP Networking and
compression.
SYSTEM CAPABILITIES
As the system grows and traffic increases, it has to deal with more tasks, resulting in slower
feature interaction. ICP systems are engineered to ensure that with different combinations of
devices, services are still maintained within normal working parameters. The exact details are
not captured here, but are specific to particular releases, since changes in software or hardware
have a bearing on the results.
Use of the System Engineering Tool is recommended to ensure that the expected configuration
is within the capabilities of the selected 3300ICP controller, or network of 3300ICPs.
TRAFFIC AND BANDWIDTH CALCULATIONS
The level of traffic that the units need to handle has the largest effect on performance and
availability. A number of areas are affected by traffic:
•
Trunks to PSTN
•
E2T (Gateway) channels
•
DSP channels
•
LAN blocking between devices
•
WAN blocking between endpoints.
See “Provisioning for Traffic” on page 58 for the traffic guidelines used to calculate system
performance.
You can calculate the amount of TDM traffic that needs to be presented in terms of CCS and
match this to a number of trunk channels. With IP, fixed channels do not exist, so this calculation
is more complicated.
To calculate the amount of traffic that can be handled over a LAN or WAN link, apply the
bandwidth calculations in the section “Bandwidth availability” on page 174. Use these to work
out the number of voice channels and assign a particular CCS rating.
WAN TRAFFIC WORKING EXAMPLE
In this example, assume the following configuration:
•
50 IP phones at the corporate centre.
Summary of Contents for MiVOICE BUSINESS
Page 1: ...Mitel MiVoice Business RELEASE 7 2 ENGINEERING GUIDELINES ...
Page 15: ...Chapter 1 ABOUT THIS DOCUMENT ...
Page 16: ......
Page 22: ...Engineering Guidelines 8 ...
Page 23: ...Chapter 2 SYSTEM OVERVIEW ...
Page 24: ......
Page 28: ...Engineering Guidelines 14 ...
Page 29: ...Chapter 3 TYPICAL CONFIGURATIONS ...
Page 30: ......
Page 73: ...Chapter 4 PHONES AND VOICE APPLICATIONS ...
Page 74: ......
Page 95: ...Phones and Voice Applications 81 Figure 9 ICP Connection Paths and Limitations ...
Page 100: ...Engineering Guidelines 86 ...
Page 101: ...Chapter 5 POWER ...
Page 102: ......
Page 128: ...Engineering Guidelines 114 ...
Page 129: ...Chapter 6 PERFORMANCE ...
Page 130: ......
Page 135: ...Chapter 7 APPLICATIONS ...
Page 136: ......
Page 142: ...Engineering Guidelines 128 ...
Page 143: ...Chapter 8 EMERGENCY SERVICES ...
Page 144: ......
Page 151: ...Chapter 9 IP NETWORKING ...
Page 152: ......
Page 167: ...Chapter 10 LICENSING ...
Page 168: ......
Page 183: ...Chapter 11 BANDWIDTH CODECS AND COMPRESSION ...
Page 184: ......
Page 209: ...Chapter 12 NETWORK CONFIGURATION CONCEPTS ...
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Page 244: ...Engineering Guidelines 230 ...
Page 245: ...Chapter 13 NETWORK CONFIGURATION SPECIFICS ...
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Page 309: ...Appendix A CAT 3 WIRING ...
Page 310: ......
Page 315: ...CAT 3 Wiring 301 Figure 55 CX MX MXe AX and LX Minimum Cable Standard ...
Page 316: ...Engineering Guidelines 302 ...
Page 317: ...Appendix B INSTALLATION EXAMPLES ...
Page 318: ......
Page 335: ...Appendix C LLDP AND LLDP MED CONFIGURATION EXAMPLES ...
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Page 347: ...Appendix D VOIP AND VLANS ...
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Page 353: ...Appendix E VOIP SECURITY ...
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Page 381: ... ...