Ap p l ic a t io n – Signamax Power over Ethernet Компьютерные Аксессуары User Manual

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Application 2: Surveillance cameras for key areas, cameras in parking lot,

and biometric access control devices and time clock

Now let’s also say your Operations Manager wants four additional cameras placed on

existing light poles at the corners of the property to cover all sides of the building. The

poles are more than 330 feet (100 meters) from the server room. AC power is provided

at the base of the poles, but plugging cameras into the AC lines to the flood lamps would

be problematic. Management would also like to install a biometric time clock terminal

connected to the Human Resources server. This device could also use PoE for mounting

in a convenient location. Since security problems in the area have been on the rise,

management also would like to better control building access using some form of

remote-actuating door locks.

This project has gotten more complex, but is still a great application

for Signamax PoE.

IP-controllable devices are available to control building access and they can be powered

via PoE, eliminating the need to run AC power to the doors. The outdoor cameras will

likely require PTZ capability to provide the coverage desired, along with a higher

wattage. The Signamax 065-1810Z media converters are ideal for this application, as

they are hardened to withstand harsh environments. They will likely be mounted on the

light pole in a box that doesn’t require temperature control. Since these media converters

use a separate power supply, they will not be included in the power requirements calcu-

lation of the Ethernet switch in the server room. The fiber terminates in the server room on

100BaseFX multimode SFP modules inserted into the 065-7861POE switch’s dual-rate

SFP receptacles. This flexibility saves money over external fiber conversion and makes

for a cleaner installation.

As noted in Figure 3, for this complex installation we have changed the PoE switch to a

higher-capacity Signamax switch with four 100/1000Base dual media ports, plus two

100/1000Base SFP-only ports. The cameras at the corners of the property are powered

by a PoE+ media converter and their individual power supplies. The media converters

connect to the switch through fiber optic cables.

This scalable PoE infrastructure can support more PoE and
PoE+ devices as needed. For example, the 065-7861POE model
can provide PoE+ capability for additional devices within a
cable distance of 330 feet (100 meters) from the server room.