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The term, Quality of Service, refers to a number of technologies such as Dierentiated Service
Codepoint (DSCP), which can identify the type of data in a data packet and so divide the packets
into trac classes that can be prioritized for forwarding. The main benets of a QoS-aware
network include the ability to prioritize trac to allow critical ows to be served before ows
with lesser priority, and greater reliability in a network by controlling the amount of bandwidth
an application may use and thus controlling bandwidth competition between applications. PTZ
trac, which is often regarded as critical and requires low latency, is a typical case where QoS
can be used to guarantee fast responses to movement requests. The prerequisite for the use of
QoS within a video network is that all switches, routers and network video products must sup-
port QoS.
Figure 9.4a Ordinary (non-QoS aware) network. In this example, PC1 is watching two video streams from cameras 1
and 2, with each camera streaming at 2.5 Mbit/s. Suddenly, PC2 starts a le transfer from PC3. In this scenario, the le
transfer will try to use the full 10 Mbit/s capacity between the routers 1 and 2, while the video streams will try to
maintain their total of 5 Mbit/s. The amount of bandwidth given to the surveillance system can no longer be guaran-
teed and the video frame rate will probably be reduced. At worst, the FTP trac will consume all the available band-
width.
Switch 1
Camera 1
Camera 2
PC 3
100 Mbit
100 Mbit
Router 1
Router 2
Switch 2
PC 1
PC 2
100 Mbit
10 Mbit
FTP 2
Video 5
HTTP 3
FTP
Video
Figure 9.4b QoS aware network. Here, Router 1 has been congured to devote up to 5 Mbit/s of the available 10
Mbit/s for streaming video. FTP trac is allowed to use 2 Mbit/s, and HTTP and all other trac can use a maximum
of 3 Mbit/s. Using this division, video streams will always have the necessary bandwidth available. File transfers are
considered less important and get less bandwidth, but there will still be bandwidth available for web browsing and
other trac. Note that these maximums only apply when there is congestion on the network. If there is unused
bandwidth available, this can be used by any type of trac.
Switch 1
Camera 1
Camera 2
PC 3
100 Mbit
100 Mbit
Router 1
Router 2
Switch 2
PC 1
PC 2
100 Mbit
FTP
Video
10 Mbit
FTP
Video
NETWORK TECHNOLOGIES - CHAPTER 9
- Table of contents 3
- Network technologies 69 5
- Wireless technologies 87 5
- Video management systems 91 5
- TABLE OF CONTENTS 5
- 1.2 Benets 8
- 1.3 Applications 12
- 1.3.4 Industrial 13
- 1.3.5 City surveillance 13
- 1.3.6 Government 13
- 1.3.7 Healthcare 13
- 1.3.8 Banking and nance 14
- Network cameras 15
- 2.2 Types of network cameras 16
- 2.2.1 Fixed network cameras 17
- 700 nm to 1000 nm range 22
- Camera elements 27
- 3.2 Lens elements 28
- 3.2.3 Lens mount standards 31
- 3.2.4 F-number and exposure 31
- 3.2.6 Depth of eld 33
- 3.3 Image sensors 34
- 3.3.3 Megapixel sensors 35
- 3.4.1 Interlaced scanning 35
- 3.4.2 Progressive scanning 36
- 3.5 Image processing 37
- 4.2 Transparent covering 40
- 4.4 Environmental protection 41
- 4.5.2 Mounting 42
- 4.6 Types of mounting 43
- 4.6.2 Wall mounts 44
- 4.6.3 Pole mounts 44
- 4.6.4 Parapet mounts 44
- 5.1 What is a video encoder? 45
- 5.5 Deinterlacing techniques 49
- 5.6 Video decoder 50
- Resolutions 51
- 6.2 VGA resolutions 52
- 6.3 Megapixel resolutions 53
- Video compression 55
- Earlier reference frame 57
- 7.2 Compression formats 59
- 7.2.2 MPEG-4 60
- 7.4 Comparing standards 61
- CHAPTER 7 - VIDEO COMPRESSION 62
- 8.1 Audio applications 63
- AUDIO Stream 64
- VIDEO Stream 64
- Recording/monitoring 64
- 8.3.1 Simplex 65
- 8.4 Audio detection alarm 66
- 8.5 Audio compression 66
- 8.5.1 Sampling frequency 67
- 8.5.2 Bit rate 67
- 8.5.3 Audio codecs 67
- Network technologies 69
- 9.1.2. Switch 71
- 9.1.3 Power over Ethernet 73
- 9.2 The Internet 75
- 9.2.1 IP addressing 76
- 9.2.1.1 IPv4 addresses 76
- 9.2.1.2 IPv6 addresses 80
- 9.3 VLANs 82
- 9.4 Quality of Service 82
- FTP 2 83
- Video 5 83
- HTTP 3 83
- 9.5 Network Security 84
- 9.5.4 HTTPS or SSL/TLS 85
- VPN tunnel 86
- HTTPS or SSL/TLS encryption 86
- Secure Non-secure 86
- Wireless technologies 87
- 10.1 802.11 WLAN standards 88
- 10.2 WLAN security 88
- 10.3 Wireless bridges 89
- Video management systems 91
- 11.1.2 NVR platform 92
- 11.2 Software platforms 93
- 11.3 System features 94
- 11.3.1 Viewing 95
- 11.3.2 Multi-streaming 95
- 11.3.3 Video recording 96
- 11.3.4 Recording and storage 97
- 11.3.7 Security 103
- 11.4 Integrated systems 104
- 11.4.3 Access control 105
- 11.4.4 Building management 105
- 11.4.6 RFID 106
- Table 12.1b 109
- Table 12.1c 109
- 12.2 Server-based storage 110
- 12.3 NAS and SAN 110
- 12.4 Redundant storage 112
- 12.5 System congurations 113
- Surveillance 114
- IP NETWORK 114
- Tools and resources 115
- Axis Communications’ Academy 117
- Contact information 118
- About Axis Communications 120
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Samsung DW-BG582B/XEE manuels
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Table des matières
Contents
8
Appendix
31
8_ Indhold
44
01 OPSÆTNING
45
FORSIGTIG
54
13 kuverter
69
01 ASENNUS
83
Ohjelmataulukko
102
TEKNISET TIEDOT
103
Perustestaus
104
13 vakioasetusta
105
Perustestaus _33
105
Tuoteseloste
106
Huomautus
107
Oppvaskmaskin
109
8_ Innhold
116
01 KONFIGURERE
119
Feilsøking og
135
Programtabell
138
SPESIFIKASJONER
139
For standardtest
140
Produktkort
142
Diskmaskin
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Innehåll
152
ANVÄNDA DISKSALT
157
Felsökning och
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För standardtest
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