Bandwidth, Codecs and Compression
191
IP applications and compression
Most Mitel IP-based applications support compression. NuPoint does not support compression.
To get the best voice quality performance from devices such as Speak@Ease™ and IP voice
mail, allocate them in a common compression zone with other devices not running compression,
e.g. default zone 1.
Consider the effect of allocating them to a compression zone where an application is used as
a central resource over a WAN link. Bandwidth restrictions may still require compression to be
enabled.
TRUNKING GATEWAY WORKING EXAMPLE
In terms of considering network bandwidth, it should be based on the 120 channels and where
they are being connected. Also consider the maximum number of compression channels
(G.729a); they are limited to 64 within a single unit. Further IP trunks use standard
non-compressed G.711 channels. Thus, in the example of toll-bypass, it is likely that trunks will
go via the IP WAN. In this case, the connection bandwidth requirements will be 11.0 Mbps. For
a fully G.711 connection (no compression), then 16.0 Mbps is needed. Note that Ethernet and
WAN links should not be fully utilized, in order to allow maintenance traffic to flow. Typically, a
link is loaded to 70% on a WAN link and 80% on a full duplex LAN.
Table 58: Trunk Gateway Bandwidth Calculation with 64 Channels Compression
ADDITION (MIXED COMPRESSED AND
NON-COMPRESSED)
BANDWIDTH
64 channels of compression (40.8k each)
2.611 Mbps
56 channels of non-compression (120-64 = 56, 96.8k each)
5.402 Mbps
Signalling overhead 10% (on total of voice)
0.801 Mbps (10% of 5.402+2.611)
TOTAL (payload)
8.835 Mbps
TOTAL (connections with LAN loading 80%)
11.0 Mbps
Table 59: Trunk Gateway Bandwidth Calculation with 120 Channels Non-compression
ADDITION (NON-COMPRESSED)
BANDWIDTH
120 channels of non-compression (100k each)
11.62 Mbps
Signalling overhead 10%
1.16 Mbps (10% of 11.62)
TOTAL (payload)
12.78 Mbps
TOTAL (connections with LAN loading)
16.0 Mbps
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 ...
Page 210: ......
Page 244: ...Engineering Guidelines 230 ...
Page 245: ...Chapter 13 NETWORK CONFIGURATION SPECIFICS ...
Page 246: ......
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 ...
Page 336: ......
Page 347: ...Appendix D VOIP AND VLANS ...
Page 348: ......
Page 353: ...Appendix E VOIP SECURITY ...
Page 354: ......
Page 381: ... ...