cctv systems networks
Post on 21-Dec-2015
16 Views
Preview:
DESCRIPTION
TRANSCRIPT
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 1
CCTV Digital Basics
Unit Unit 33 – Networks – Networks
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 2
Objectives
Department
After completing this unit, you will be able to:
Define the elements of network traffic
Describe how network traffic is controlled and checked
Define Bits and Bytes, and their relationship
Convert Bytes to Bits
Describe bandwidth and how it impacts network traffic
Calculate network bandwidth requirements
Identify and describe the functions of different network
components
Unit 3 – Networks
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 3
Department
Unit 3 – Networks
Factors to consider for network CCTV
The size of the security network• Number of cameras, and monitoring points• The extent of the network system (LAN, WAN)
Functions of security system• Monitor only for observations• Monitor for identification and security control of
environment Type and capacity of network
• Bandwidth of network components• Firewall and network security issues• Network traffic volume
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 4
Department
Unit 3 – Networks
Network building blocks
Computer and operating system software
Network Interface Card (NIC)
Network connectivity
Network peripherals
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 5
Department
Unit 3 – Networks
Three Basic Types of NetworksClient/Server network:
• Servers - Share resources such as files, printers, memory space and by their ability to connect to other network systems.
• Clients - Computers configured to use the resources of server computers.
Peer-to-Peer network:• Every computer is an equal and can function
as a client and a server. Networks limited to 10-15 computers on a single LAN system.
Point-to-point network:• The most basic type of network with a direct
connection between two computers only.
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 6
Unit 3 – Networks
Half-duplex vs. Full-duplex
Half-duplexing – Network communications going in only one direction at a time.
•Most LAN systems
•Coax cable
Full-duplexing – Network communications going in two directions at the same time.
•Most WAN systems
•Separate channel required
•Twisted pair or fiber optics
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 7
Unit 3 – Networks
Bandwidth
Analog Bandwidth – Measures the difference between the highest and lowest wavelength frequency. Hertz is the measurement used.
Digital Bandwidth –Measures the data transfer rate of data within a set time period (sec.) Bits/second is the measurement used.
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 8
Unit 3 – Networks
Bytes to Bits Conversions
Bytes = File sizes (10 MB), Hard drive size (100 GB)
bits = Data transfer rate, bandwidth (56 Kbps, 10Mbps)
There are usually 8 bits in every Byte. Multiply the Byte file size X 8.
15,000 Bytes x 8 = 120,000 bits (120K)
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 9
Unit 3 – Networks
Calculating Digital Video Bandwidth
Determine video output (bps)
(Video signal size X #* bits) X IPS = Video output
(15,000 X 8) X 30 ips = 3,600,000 bits/sec (3.6 Mbps)
Camera requires 3.6 Mbps bandwidth
* The number of bits is determined by the digital processor. In this example an 8 bit processor is used.
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 10
Unit 3 – Networks
Network Capacity for Video
How many cameras can a network take?
About 65% of network bandwidth is available
1. Network Bandwidth X 65% = Usable bandwidth
100,000,000 X 0.65 = 65,000,000 bps maximum
2. Available bandwidth / Camera bandwidth = Maximum video connections allowed
65,000,000 / 3,600,000 = 18 camera connections
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 11
Unit 3 – Networks
Network Communications
• There is a continuous stream of data traffic on networks (35% volume). Checks for network connections, device availability, routing information, self diagnostics.
• Data is sent in “packets” with “header” information.
• Who are you? (addressing)
• What type of device are you? (functionality)
• Where are you located? (routing)
• Do you speak my language? (protocols)
• Are we allowed to talk to each other? (security)
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 12
Unit 3 – Networks
Network Communications
• There is a continuous stream of data traffic on networks (35% volume). Checks for network connections, device availability, routing information, self diagnostics.
• Data is sent in “packets” with “header” information.
• Who are you? (addressing)
• What type of device are you? (functionality)
• Where are you located? (routing)
• Do you speak my language? (protocols)
• Are we allowed to talk to each other? (security)
I am 161.88.16.2 nickname “training room”
I am a User PC
I am in subnet address 161.88.16.0
I communicate using TCP/IP
What is your password?
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 13
Unit 3 – Networks
Protocols
Sets of rules or standards that controls or enables the connection, communication, and data transfer between two computing destinations.Some common network protocols:
Ethernet – Suite of protocols for LAN networks. 10Base-T (10 Mbps) – 1000Base-T (1000 Mbps)
TCP/IP – (Transmission Control Protocol/Internet Protocol) Suite of protocols based for both private networks and internet
UDP – (User Datagram Protocol) Uses IP and a subset of TCP. For small data packets, fast transmission rates by not checking packet information
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 14
Unit 3 – Networks
International Communication Standards
Standards for sending voice, video and data over digital or normal telephone lines.
ISDN – (Integrated Service Digital Network) phone WAN systems. Between 128 – 384 Kbps.
DSL – (Digital Subscription Line) “Always on” WAN phone systems. 128 Kbps upstream, up to 8 Mbps downstream.
Often referred to as “last mile” technology to connect home/office to telephone switch. Not used between switching stations.
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 15
Unit 3 – Networks
Network devices
Hub – A number of ports for connecting nodes on a LAN network. Sends the data to all connected nodes.
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 16
Unit 3 – Networks
Network devices
Switch – Multiple ports that connect to different nodes.
Has memory and processing function that identifies IP addresses and directs the data to the specific addressed node(s).
Usually has more throughput than Hubs.
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 17
Unit 3 – Networks
Network devices
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 18
Unit 3 – Networks
Network devices
Routers – Connecting points between different network systems.
They direct the data to the specific addressed networks, and are “smart” in that they can identify the best transmission route.
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 19
Unit 3 – Networks
Network devices
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 20
Unit 3 – Networks
Network devices
Gateways – Function as an addressed node on networks and act as the entrance point to the network it has domain over.
Can function as both a proxy server and firewall.
Works with a Router to direct data to the proper IP addressed nodes.
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 21
Unit 3 – Networks
Network devices
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 22
Answer the review questions for Unit 3
Unit 3 – Networks
© Robert Bosch GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties.
U3 - 23
Unit 1 – Defining Digital
top related