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148 Efficient Networking
P0604630 03
Bandwidth requirements on half duplex links
The following table provides bandwidth requirements for normal two-way voice calls on a
half-duplex link for a variety of link protocols, codec types and payload sizes.
Table 39 Bandwidth Requirements per Gateway port for half-duplex links
With no silence suppression, both the transmit path and the receive path continuously transmit
voice packets. Therefore, the peak bandwidth requirement per call on half-duplex links is:
Peak Bandwidth per call = 2(Continuous Transmission Rate)
(Half Duplex links, No Silence Suppression)
On half-duplex links with silence suppression enabled, the half-duplex nature of normal voice
calls allows the sender and receiver to share the same bandwidth on the common channel. While
the sender is talking, the receiver is quiet. Since only one party is transmitting at a time, silence
suppression reduces the peak bandwidth requirement per call on a half-duplex link to:
Peak Bandwidth per call = 1(Continuous Transmission Rate)
(Half Duplex links, With Silence Suppression)
Codec
Type
Payload
Size
Ethernet B/W
2
PPP B/W FR B/W
No SP
Silence
Suppression No SP
Silence
Suppression No SP
Silence
Suppression
ms peak
(kbit/s)
peak
(kbit/s)
Avg
(kbit/s)
peak
(kbit/s)
peak
(kbit/s)
Avg
(kbit/s)
peak
(kbit/s)
peak
(kbit/s)
Avg
(kbit/s)
G. 7 11
(
64 kb/s)
10 233.6 233.6
3
233.6
3
195.2 195.2
3
195.2
3
206.4 206.4
3
206.4
3
20* 180.8* 180.8
3
* 180.8
3
* 161.6* 161.6
3
* 161.6
3
* 167.2* 167.2
3
* 167.2
3
*
30 163.2 163.2
3
163.2
3
150.4 150.4
3
150.4
3
154.2 154.2
3
154.2
3
G. 7 29
(8 kb/s)
10 121.6 60.8 60.8 83.2 41.6 41.6 94.4 47.2 47.2
20* 68.8* 34.4* 34.4* 49.6* 24.8* 24.8* 55.2* 27.6* 27.6*
30 51.2 25.6 25.6 38.4 19.2 19.2 42.2 21.1 21.1
G.723.1
(6.3 kb/s)
30* 48.0* 24.0* 24.0* 35.2* 17.6* 17.6* 39.0* 19.5* 19.5*
G.723.1
(5.3 kb/s)
30* 45.8* 22.9* 22.9* 33.0* 16.5* 16.5* 36.8* 18.4* 18.4*
Notes:
1)
*
indicates payload sizes used by Business Communications Manager 2.5 for transmission. Other values listed indicate
payload sizes that BCM can receive.
2) Ethernet bandwidth includes the 14 byte Ethernet frame overhead plus a 12 byte inter-frame gap.
3) G.711 does not support silence suppression.
- Business Communications 1
- Manager 3.5 1
- IP Telephony Configuration 1
- Trademarks 2
- Contents 3
- Chapter 4 4
- Chapter 5 5
- Chapter 6 5
- Before you begin 13
- Symbols used in this guide 13
- Text conventions 14
- Acronyms 15
- Related publications 16
- How to get help 17
- APAC (Asia Pacific) 18
- Technical Support - CTAS 18
- Chapter 1 19
- Introduction 19
- IP telephones and VoIP trunks 20
- Figure 1 Network diagram 22
- Telephones 23
- Gatekeepers on the network 24
- IP network 24
- Key IP telephony concepts 25
- Jitter Buffer 26
- QoS routing 27
- Chapter 2 29
- Prerequisites checklist 29
- Network devices 30
- Network assessment 30
- Resource assessment 31
- Keycodes 31
- Figure 2 Global IP settings 33
- VoIP trunks 36
- IP telephone records 37
- Chapter 3 39
- Installing IP telephones 39
- Choosing a codec 43
- Choosing a Jitter Buffer 43
- Before installing 44
- Using a 3-port switch 44
- Other troubleshooting tips 49
- Configuring DHCP 50
- IP telephony DHCP notes 51
- Checking IP server status 53
- Figure 7 IP Terminal status 54
- 6 Click the Save button 55
- Using the Hot Desking feature 58
- Notes about Hot Desking 59
- Customizing feature labels 60
- Moving IP telephones 65
- Figure 16 i2050 Switch type 68
- Access points 70
- Handset and call functions 70
- Configuring NetVision records 71
- Assigning general settings 72
- Testing the handset functions 76
- Changing a handset Name 78
- Deregistering a telephone 79
- Configuring local VoIP trunks 81
- Published IP address 82
- Configuring media parameters 85
- Setting up the local gateway 87
- P0604630 03 100
- Outgoing call configuration 101
- PSTN call to remote node 103
- Call process 104
- Describing a fallback network 106
- Figure 34 Route XXX screen 108
- Figure 35 VoIP schedule 110
- How it works 112
- Setting up the VoIP schedule 114
- Connecting an i200X telephone 119
- Quality of Service Monitor 120
- PSTN fallback metrics 121
- Chapter 7 123
- Modifying PortRanges 125
- Using a gatekeeper 127
- Gatekeeper call scenarios 133
- Faxing over VoIP lines 134
- Chapter 8 139
- WarehouseHead Office 140
- Appendix A 145
- Efficient Networking 145
- Network engineering 146
- LAN engineering examples 150
- WAN engineering 150
- (8 kb/s) 151
- Setting Non-linear processing 152
- Enough link capacity 155
- Not enough link capacity 155
- Further network analysis 156
- Reduce link delay 157
- Reducing hop count 157
- Routing issues 158
- Appendix B 161
- Silence compression 161
- Time -> 163
- Bandwidth -> 163
- Channel/Link Max 163
- Comfort noise 166
- Appendix C 167
- Network performance utilities 167
- Appendix D 169
- Interoperability 169
- Speech path setup methods 170
- Media path redirection 171
- Gatekeeper 171
- No feedback busy station 172
- Interoperability 173 173
- 174 Interoperability 174
- Using VLAN on the network 175
- 176 Interoperability 176
- Symbol NetVision telephones 177
- 178 Interoperability 178
- Interoperability 179 179
- 180 Interoperability 180
- Interoperability 181 181
- 182 Interoperability 182
- Appendix E 183
- Quality of Service 183
- 184 Quality of Service 184
- Measuring Intranet QoS 185
- Recording routes 186
- Adjusting Ping measurements 187
- Measurement procedure 188
- Quality of Service 189 189
- Traffic mix 190
- TCP traffic behavior 190
- Network Quality of Service 191
- Network monitoring 192
- Quality of Service parameters 192
- Fallback to PSTN 193
- 194 Quality of Service 194
- Glossary 195
- 196 Glossary 196
- Glossary 197 197
- 198 Glossary 198
- Glossary 199 199
- 200 Glossary 200
- Glossary 201 201
- 202 Glossary 202
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