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Figure 9.5b The dierence between HTTPS (SSL/TLS) and VPN is that in HTTPS only the actual data of a packet is

encrypted. With VPN, the entire packet can be encrypted and encapsulated to create a secure “tunnel”. Both tech-

nologies can be used in parallel, but it is not recommended since each technology will add overhead and decrease the

performance of the system.

VPN tunnel

PACKET

HTTPS or SSL/TLS encryption

DATA

Secure Non-secure

CHAPTER 9 - NETWORK TECHNOLOGIES

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 119 120

Table of contents 3
Network technologies 69 5
Wireless technologies 87 5
Video management systems 91 5
TABLE OF CONTENTS 5
1.2 Benets 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 congurations 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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