BLACKBOX-LPR110 PoE Repeater 乙太網路與PoE延長器

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BLACKBOX-LPR110 PoE Repeater 乙太網路與PoE延長器

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商品編號: BLACKBOX-LPR110

BLACKBOX-LPR110 PoE Repeater 乙太網路與PoE延長器

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★★★★商品說明★★★★

Description

PoE Repeater

Quick Facts

Break through the Ethernet 100-meter limit—boost Ethernet and PoE power to 300 meters.

Plug-and-play ease of use.

Autosensing, autonegotiating 10-/100-Mbps Ethernet ports.

Auto MDI/MDI-X means you never need a crossover cable.

Further Details

The PoE Repeater acts as a PoE extender, enabling you to extend PoE connections beyond the 100-meter limit to access faraway PoE devices.

The repeater passes on both data and power, so it needs no separate power supply—add one repeater for an additional 100 meters (328 ft.) or daisychain two repeaters to extend the reach of your PoE an additional 200 meters (656 ft.) on top of the standard PoE distance of 100 meters (328 ft.) for a total reach of 300 meters (984 ft.) Because each repeater uses about 2.5 watts itself, we do not recommend daisychaining beyond two units. Two repeaters daisychained support a PoE PD end device that needs up to 6.49 watts.

Installation is easy—just plug in the Ethernet cable and go.

Technical Specifications for PoE Repeater:

Environmental — Operating temperature: 32 to 122° F (0 to 50° C);
Humidity: (2) 5–95%, noncondensing
CE Approval — Yes
Connectors — Ethernet: (2) RJ-45
Indicators — LEDs: (1) Power, (1) OUT, (1) IN
Power — Input: IEEE 802.3af Class 0 (minimum 12.95 watts);
Output: IEEE 802.3af Class 1 or 2 (maximum 6.49 watts per PoE repeater used);
Maximum power dissipation: 2.5 watts
Size — 1.1"H x 4.7"W x 3.5"D (2.8 x 12 x 9 cm)
　

NOTE: Because each repeater uses about 2.5 watts itself, we do not recommend daisychaining beyond two units.

　

★★★★商品規格描述★★★★

Black Box Explains...Power over Ethernet (PoE)..

What is PoE?
The seemingly universal network connection, twisted-pair Ethernet cable, has another role to play, providing electrical power to low-wattage electrical devices. Power over Ethernet (PoE) was ratified by the Institute of Electrical and Electronic Engineers (IEEE) in June 2000 as the 802.3af-2003 standard. It defines the specifications for low-level power delivery—roughly 13 watts at 48 VDC—over twisted-pair Ethernet cable to PoE-enabled devices such as IP telephones, wireless access points, Web cameras, and audio speakers.

Recently, the basic 802.3af standard was joined by the IEEE 802.3at PoE standard, ratified on September 11, 2009, which supplies up to 25 watts to larger, more power-hungry devices. 802.3at is backwards compatible with 802.3af.

How does PoE work?
The way it works is simple. Ethernet cable that meets CAT5 (or better) standards consists of four twisted pairs of cable, and PoE sends power over these pairs to PoE-enabled devices. In one method, two wire pairs are used to transmit data, and the remaining two pairs are used for power. In the other method, power and data are sent over the same pair.

When the same pair is used for both power and data, the power and data transmissions don’t interfere with each other. Because electricity and data function at opposite ends of the frequency spectrum, they can travel over the same cable. Electricity has a low frequency of 60 Hz or less, and data transmissions have frequencies that can range from 10 million to 100 million Hz.

Basic structure.
There are two types of devices involved in PoE configurations: Power Sourcing Equipment (PSE) and Powered Devices (PD).

PSEs, which include end-span and mid-span devices, provide power to PDs over the Ethernet cable. An end-span device is often a PoE-enabled network switch that’s designed to supply power directly to the cable from each port. The setup would look something like this:

End-span device → Ethernet with power

A mid-span device is inserted between a non-PoE device and the network, and it supplies power from that juncture. Here is a rough schematic of that setup:

Non-PoE switch → Ethernet without PoE → Mid-span device → Ethernet with power

Power injectors, a third type of PSE, supply power to a specific point on the network while the other network segments remain without power.

PDs are pieces of equipment like surveillance cameras, sensors, wireless access points, and any other devices that operate on PoE.

PoE applications and benefits.
• Use one set of twisted-pair wires for both data and low-wattage appliances.
• In addition to the applications noted above, PoE also works well for video surveillance, building management, retail video kiosks, smart signs, vending machines, and retail point-of-information systems.
• Save money by eliminating the need to run electrical wiring.
• Easily move an appliance with minimal disruption.
• If your LAN is protected from power failure by a UPS, the PoE devices connected to your LAN are also protected from power failure.
　