cctv systems network pitfalls

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U6 - 1

CCTV Digital Basics

Unit Unit 66 – Network – Network Pitfalls Pitfalls


U6 - 2

Objectives

Department

After completing this unit, you will be able to:

Identify at least 3 potential factors that can impact CCTV

connectivity to networks

Identify at least 3 factors that can impact CCTV bandwidth

requirements

Identify and describe how different network components

can limit network communications

Identify and describe 3 computer based tests for network

connectivity

Unit 6 – Network Pitfalls


U6 - 3

Department


Potential trouble spots for digital CCTV

Poor understanding of customer needs and expectations

Poor communications with those responsible for the network system CCTV is to integrate into

Lack of proper financial budgeting Improper product specifications Network bandwidth and traffic levels Firewall restrictions Network addressing Network connectivity System compatibility


U6 - 4

Department


Bandwidth and storage requirements

Pre-qualifing network and security requirements for signal transmission

• Number of cameras required – include remote PTZ needs

• Level and type of scene activity

• Image resolution requirements

• Video compression options

• Alarm activity and monitoring requirements


U6 - 5

Department


Bandwidth and storage requirements

Pre-qualifing network and security requirements for digital storage and archiving

• Number of cameras required – include remote PTZ needs

• The frame rate of capture (ips)

• Video compression options

• Image resolution requirements

• Amount of recorded data to be saved/archived

• Type of recording durations (continuous, event or alarm driven)


U6 - 6

Department


Connectivity

Integrating CCTV cameras and control/monitoring stations into IT networks

• Obtain node and IP addresses for CCTV components

• Understand routing and subnet masking issues

• Type of signal required (multicast/unicast)

• Type of transmission medium, bandwidth and traffic levels/patterns

• Network gateway and firewall restrictions


U6 - 7

Department


Connectivity tests

ARP (Address Resolution Protocol) – Lookup table tool used to associate IP and MAC addresses

IPCONFIG (Internet Protocol Configuration) – Tool used to find and renew IP addresses on a computer, router, or other address sensitive device

• Ipconfig /all – This provides all the settings of your node and information on the network connected to

• Ipconfig /release – This releases the assigned IP address to the computer connected at that node point

• Ipconfig /renew – The computer you are on will be assigned a new IP address


U6 - 8

Department


IPCONFIG


U6 - 9

Department


Connectivity tests

PING – “Pinging” an IP address checks for communication response between two nodes within a programmable timeout time frame


U6 - 10

Department


Connectivity tests

Factors that can cause a no response to a ping

• Bad network connection

• The node sending to could be down or off

• A firewall blocking issue

• The ping message is being filtered out

• The communications timeout is set too short

PING – “Pinging” an IP address checks for communication response between two nodes within a programmable timeout time frame


U6 - 11

Department


Firewalls

Can be hardware (i.e. Sonicwall) or software (i.e. ISA)

Purpose is to restrict network communications in and/or out of a network domain

Techniques of firewall protection

• Packet filtering – Most common type. Monitors packet heading to identify the source and destination IP addresses. A rules list filters out specific IP addresses

• Application gateway – Screens out specific types of applications (such as from FTP or telnet servers)

• Circuit-level gateway – Screens for specific types of connections (i.e. TCP or UDP)


U6 - 12

Department


Firewalls

Proxy servers can be used to hide the true network address from other networks

Firewalls are effective first line of network security


U6 - 13

Department


Communicating with IT departments

What is the network type?

What type of network is communications used?

What is the through put (bandwidth) of the network and ports

What is the required transmission rate for the CCTV system

What is the network architecture? (hubs, switches)

Are the CCTV camera within network range of the hub?

What are the firewall restrictions?

What are the IP addresses and port numbers for each camera?

What is the network traffic level and patterns?


U6 - 14

Thank you for your participation in

CCTV Digital Basics



U6 - 15

Unit 1 – Defining Digital

cctv systems network pitfalls

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