Avaya BCM 2.5 IP Telephony Konfigurationsanleitung Seite 92
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92 Networking
P0937663 02.0
The difference between the current capacity and its acceptable limit is the available capacity. For
example, a T1 link used at 48% during the peak hour with a planning limit of 85% has an available
capacity of approximately 568 kbit/s.
Network Engineering
Engineer the network for worst-case numbers to indicate the spare bandwidth a LAN must have to
handle peak traffic. It is important to plan that the LAN/WAN can handle the IP telephony traffic
using the defined codec, without delay or packet loss. The installer or administrator must select
one configuration and then set up the LAN/WAN so there is more bandwidth than the IP telephony
output.
Table 10 on page 93 provides bandwidth characteristics for the transmission of voice over IP for
various link types given codec type and payload sizes. The bandwidths provided in Table 10 on
page 93 explain the continuous transmission of a unidirectional media stream.
The peak bandwidth and average bandwidth requirements for a normal two-way call must take into
account the affects of full and half duplex links and the affects of silence suppression. See Table 11
on page 94 and Table 12 on page 95 for voice Gateway bandwidth requirements.
Peak bandwidth is the amount of bandwidth that the link must provide for each call. Considering
voice traffic only, the number of calls a link can support is:
Number of Calls = Usable Link Bandwidth / peak Bandwidth per call
The average bandwidth takes into account the affects of silence suppression, which over time tends
to reduce bandwidth requirements to 50% of the continuous transmission rate. The affects of
silence suppression on peak bandwidth requirements differ depending on whether the link is
half-duplex or full-duplex. See Appendix B, “Silence compression,” on page 103 for more
information.
When engineering total bandwidth requirements for LANs and WANs, additional bandwidth must
be allocated for data. Refer to standard Ethernet engineering tables for passive 10BaseT repeater
hubs. Refer to the manufacturer’s specification for intelligent 10BaseT layer switches. WAN links
must take into account parameters such as normal link utilization and committed information rates.
Number of calls
Usable Link bandwidth
peak bandwidth per call
=
- Business Communications 1
- Manager 2.5 1
- IP Telephony Configuration 1
- Trademarks 2
- Contents 3
- Chapter 4 4
- Chapter 5 5
- Appendix A 5
- Before you begin 13
- Symbols used in this guide 14
- Text conventions 14
- Acronyms 15
- UDP User Datagram Protocol 16
- WAN Wide Area Network 16
- Related publications 17
- How to get help 18
- Chapter 1 19
- Introduction 19
- The IP telephony network 20
- Chapter 1 Introduction 21 21
- Figure 1 Network diagram 21
- Telephones 22
- IP Network 22
- Key IP Telephony Concepts 23
- Jitter Buffer 24
- QoS routing 24
- Chapter 1 Introduction 25 25
- 26 Chapter 1 Introduction 26
- Chapter 2 27
- Prerequisites checklist 27
- Network assessment 28
- Resource Assessment 28
- Keycodes 29
- IP Telephones 30
- Chapter 3 31
- Installing IP Telephones 31
- Choosing a codec 33
- Choosing a Jitter Buffer 33
- Before Installing 34
- Manual Cfg DHCP(0 no, 1 yes) 35
- Configuring DHCP 38
- Figure 4 DHCP summary 39
- Figure 5 DHCP range 40
- Figure 6 IP Terminal status 41
- Figure 7 Configuration menu 42
- Figure 9 IP Terminal Status 43
- Download Pending 44
- Deregistering offline DNs 45
- Moving IP telephones 46
- H.323 devices 47
- 4 Click the Save button 49
- VoIP Trunk Configuration 51
- Configuring media parameters 53
- Configuring codecs 54
- Setting Silence Compression 54
- Setting Jitter Buffers 55
- Outgoing call configuration 56
- Figure 21 Trunk/Line data 57
- Figure 22 Line pool 58
- Configuring a remote gateway 59
- Configuring PSTN fallback 60
- Setting up a VoIP schedule 61
- Vo I P 62
- Configuring routes 63
- Figure 28 Route list 64
- Figure 29 Add route dialog 64
- Creating a destination code 65
- Figure 32 Normal schedule 66
- Configuring digits 67
- Activating the VoIP schedule 67
- Turning on QoS monitor 68
- Incoming call configuration 70
- Example configuration 71
- Making calls 74
- Connecting an i200X telephone 75
- Quality of Service Monitor 77
- Port settings 77
- Using firewalls 78
- Using a gatekeeper 80
- Gatekeeper call scenarios 82
- Typical applications 85
- MCDN functionality 86
- Networking 91
- Network Engineering 92
- Networking 93 93
- (64 kb/s) 93
- (5.3 kb/s) 93
- LAN Engineering Examples 95
- WAN engineering 96
- Setting Non-linear processing 96
- Networking 97 97
- Traceroute 97
- Enough link capacity 98
- Not enough link capacity 98
- Implementing the network 99
- Further network analysis 99
- Reduce link delay 100
- Reducing hop count 100
- Adjust the jitter buffer size 101
- Reduce packet errors 101
- Routing issues 102
- Silence compression 103
- Appendix B 103
- 104 Silence compression 104
- P0937663 02.0 104
- Silence compression 105 105
- 106 Silence compression 106
- Silence compression 107 107
- Comfort Noise 108
- Appendix C 109
- Network Performance Utilities 109
- Appendix D 111
- Interoperability 111
- Speech Path Setup Methods 112
- Media Path Redirection 112
- Gatekeeper 113
- Symbol Telephones 114
- Appendix E 115
- Quality of Service 115
- Measuring Intranet QoS 116
- Recording routes 117
- Adjustment for processing 118
- Late packets 118
- Quality of Service 119 119
- Traffic mix 120
- Network Quality of Service 121
- Packet loss 122
- Packet delay 122
- Delay variation (jitter) 123
- 124 Quality of Service 124
- Glossary 125
- 126 Glossary 126
Verwandte Produkte und Handbücher für Gateways / Controller Avaya BCM 2.5 IP Telephony
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