Bandwidth, Codecs and Compression
175
synchronous telecom link, these issues are resolved through mechanisms such as framing data
into fixed timeslots. The following table contains some simple guidelines for LAN and WAN links.
LAN bandwidth
The following table contains some simple guidelines for LAN connections (assuming that all
the available bandwidth is used for voice traffic only).
“LAN connections guidelines” reflects the maximum usable bandwidth based on the physical
connection. Other factors in the network must also be considered, including:
•
the percentage of data traffic shared with the voice on a common connection.
•
the percentage of broadcast traffic; a “flatter” LAN will result in more traffic.
•
the percentage of data traffic allowed in the egress queues even under congestion.
•
whether the uplink from a switch is blocking in terms of possible data input, e.g. a 1 Gbps
uplink may not be enough for a 24 port switch running 100 Mbps on each input link.
•
whether the switch backplane can handle the data throughput in terms of available band-
width and packet per second rate.
The LAN connection guidelines table also shows the maximum capability of a LAN link assuming
that the link is used purely for voice traffic. If the link is shared with other devices such as PCs,
then some priority mechanism is required to ensure that the voice gets the available bandwidth
when needed. Also, in a busy network with multiple broadcasts, the available bandwidth is
reduced by this percentage. For example, in a network with 10% broadcast traffic (at 10 Mbps),
Table 48: LAN and WAN Link Guidelines
DATA CONNECTION TYPE
PERCENTAGE OF
BANDWIDTH AVAILABLE
EXAMPLE
LAN – 10BaseT Half Duplex
40%
10 Mbps => 4 Mbps available
LAN – 10BaseT Full Duplex
80%
10 Mbps => 8 Mbps available
LAN – 100BaseT Half Duplex
40%
100 Mbps => 40 Mbps available
LAN – 100BaseT Full Duplex
80%
100 Mbps => 80 Mbps available
WAN – 1.5 Mbps Frame Relay without QoS
mechanism in router
40%
1.5 Mbps => 600 kbps available
WAN – 1.5 Mbps Frame Relay with QoS
mechanism in Router
70%
1.5 Mbps => 1.05 Mbps available
Table 49: LAN Connections Guidelines (based on a 20 ms packet rate)
CABLE CAPACITY
BANDWIDTH
PHONE USAGE
AT G.711
VOICE
CHANNELS
G.711
VOICE
CHANNELS
G.729A (X 2.5)
10BaseT Half Duplex
40%
2%
20
50
10BaseT Full Duplex
80%
1%
80
200
100BaseT Half Duplex
40%
0.2%
200
500
100BaseT Full Duplex
80%
0.1%
800
2000
Содержание MiVOICE BUSINESS
Страница 1: ...Mitel MiVoice Business RELEASE 7 2 ENGINEERING GUIDELINES ...
Страница 15: ...Chapter 1 ABOUT THIS DOCUMENT ...
Страница 16: ......
Страница 22: ...Engineering Guidelines 8 ...
Страница 23: ...Chapter 2 SYSTEM OVERVIEW ...
Страница 24: ......
Страница 28: ...Engineering Guidelines 14 ...
Страница 29: ...Chapter 3 TYPICAL CONFIGURATIONS ...
Страница 30: ......
Страница 73: ...Chapter 4 PHONES AND VOICE APPLICATIONS ...
Страница 74: ......
Страница 95: ...Phones and Voice Applications 81 Figure 9 ICP Connection Paths and Limitations ...
Страница 100: ...Engineering Guidelines 86 ...
Страница 101: ...Chapter 5 POWER ...
Страница 102: ......
Страница 128: ...Engineering Guidelines 114 ...
Страница 129: ...Chapter 6 PERFORMANCE ...
Страница 130: ......
Страница 135: ...Chapter 7 APPLICATIONS ...
Страница 136: ......
Страница 142: ...Engineering Guidelines 128 ...
Страница 143: ...Chapter 8 EMERGENCY SERVICES ...
Страница 144: ......
Страница 151: ...Chapter 9 IP NETWORKING ...
Страница 152: ......
Страница 167: ...Chapter 10 LICENSING ...
Страница 168: ......
Страница 183: ...Chapter 11 BANDWIDTH CODECS AND COMPRESSION ...
Страница 184: ......
Страница 209: ...Chapter 12 NETWORK CONFIGURATION CONCEPTS ...
Страница 210: ......
Страница 244: ...Engineering Guidelines 230 ...
Страница 245: ...Chapter 13 NETWORK CONFIGURATION SPECIFICS ...
Страница 246: ......
Страница 309: ...Appendix A CAT 3 WIRING ...
Страница 310: ......
Страница 315: ...CAT 3 Wiring 301 Figure 55 CX MX MXe AX and LX Minimum Cable Standard ...
Страница 316: ...Engineering Guidelines 302 ...
Страница 317: ...Appendix B INSTALLATION EXAMPLES ...
Страница 318: ......
Страница 335: ...Appendix C LLDP AND LLDP MED CONFIGURATION EXAMPLES ...
Страница 336: ......
Страница 347: ...Appendix D VOIP AND VLANS ...
Страница 348: ......
Страница 353: ...Appendix E VOIP SECURITY ...
Страница 354: ......
Страница 381: ... ...