Canon IP ReadyTM Series Video Alarm FDW75C12N Specifikace stáhnout pdf (Strana 5)

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cessor that can handle data more efﬁciently

than those used in a Fast Ethernet switch. As

higher megapixel cameras are used in great-

er numbers, high speed processing of large

amounts of data becomes more critical to

providing optimal video system performance.

Again, it is best to consider what the future may

bring to your system.

Tip No. 9 – Unmanaged vs. Smart

and Managed

Smart and managed switches allow you to get

the most from your IP video network. Unman-

aged switches may be ﬁne for small systems

but when camera counts exceed single digits,

smart switches are a smart choice. Smart and

managed switches add a wide array of addi-

tional features that add value to the completed

video network.

Some commonly used Smart Switch features

are:

• Real Time Power Statistics – Power usage

is detailed by port.

• PoE Power Management – The ability to

limit or deny power by port, power cycle

devices, prioritize devices in case of power

shortfall, and schedule power to individual

ports.

• VLAN Support – Set up the network to

securely segment groups of devices.

• Cable Diagnostics – The ability to test

attached network cables for opens, shorts,

identify the location of faults and verify cable

length.

• Loop Detection – Identiﬁes and shuts down

loops in the network path.

• Notiﬁcations – Alerts can be sent to system

administrators including when a link goes

down or comes up, PoE power is inter

rupted, or a short occurs.

• Optional Ports: Most smart switches have

optional ports to support linking to other

network devices. These

ports may be Gigabit

twisted pair connections,

SFP ports that support

small form pluggable

(SFP) modules or 10

Gigabit connections.

SFP modules vary in

type and may be used

to create either

Fast

Ethernet

or Gigabit

connections

that utilize unshielded

twisted pair or ﬁber

cabling.

When you use these tips as guidelines you will

be able to select a switch that is suitable for its

purpose. Of course your TRI-ED sales profes-

sional is always ready to help you through the

process if necessary.

IP VIDEO IMAGING

Tip No. 10 - Getting Your Shot with

IP Video Cameras

IP Video cameras come in a variety of resolu-

tions that allow you to get the image required.

The increased pixel density of the images can

allow us to capture video with far greater clar-

ity than conventional analog cameras. It is im-

portant to understand that how we utilize those

pixels will ultimately dictate whether or not we

are successful.

Digitally zooming on an analog image can cause

it to appear poor or pixilated. We can experi-

ence the same condition with a megapixel im-

age if we do not have enough pixels in the im-

age to support our objective. If you take a wide

shot of a large parking lot with a 1.3MP camera

you may ﬁnd that the image becomes pixilated

upon digital zoom,much like an analog one. We

can assure we get good results by verifying that

we have a minimum number of pixels per foot

in our image. The following values can be used

as a guideline to help you ﬁnd your minimum

standard of quality for the IP video images. The

components used in video products vary, as

do personal preferences. As you become more

comfortable with this concept you may ﬁnd that

you want more or less pixels in your images.

Observation – Low Detail (General overview)

<40 pixels/ft

Surveillance – Medium Detail (Capture general

features of people or objects)

40-60 pixels/ft

Identiﬁcation – High Detail (License Plate

Recognition and visual Facial

Recognition) >60 pixels/ft

To achieve the proper number of pixels in your

image you need to know the width of the area

to be covered in feet. Then divide the horizon-

tal pixels available by the number of feet to be

covered.

1280x720 = 0.9MP or 720p

1280x1024 = 1.3MP

1600x1200 = 2MP

1920x1080 = 2.1MP or 1080p

2048x1536 = 3MP

2592x1944 = 5MP

(Horizontal x Vertical pixels)

Example: License Plate Capture for

a driveway that is 20 feet wide. 20 feet

x 60 pixels per foot = 1200. Use a 720p

(1280x720) or 1.3MP (1280x1024) camera at

the minimum.

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