let us start...........: July 2009

Tuesday, July 21, 2009

NETWORK ROUTERS

Network Liquidators is your premier online destination for buying and selling routers. We keep an extensive inventory of network routers in stock at most times which are usually available for overnight delivery. Along with our used routers, we also carry many other networking products including memory, gbics, interface cards, network modules, switches, cables, gbics, chassis, and various other parts and accessories.

All of our network routers go through a grueling inspection, testing, and refurbishing process and all of our networking routers comes standard with our Lifetime Warranty (end-user customers only). For details about our inspection, testing, and refurbishing process, click here.

If you cannot find the refurbished routers you are looking for, please call one of our account executives at 1-800-998-9862 for a custom quote. If you are not sure which network router you need, we have technicians on staff experienced with networking products that can help you with your configurations.

We both buy and sell new, used and refurbished network routers and other networking accessories. Let us know if you have any surplus of routers that you are looking to sell and we will immediately reply with fair market value. Please call our purchasing department at 1-800-998-9862. Below is a listing of some of our more popular routers. If you are looking to buy routers at a great price, then Network Liquidators is for you.

Cisco 7206VXR400 Router Chassis	Cisco 3620 Router	Cisco 2621 Router

Friday, July 10, 2009

PATCH ANTENNA

PATCH ANTENNA

PATCH ANTENNA

PATCH ANTENNA

PATCH ANTENNA

PATCH ANTENNA

RHOMBIC ANTENNAS

RHOMBIC ANTENNA

RHOMBIC ANTENNA

RHOMBIC ANTENNA

RHOMBIC ANTENNA

RHOMBIC ANTENNA

RHOMBIC ANTENNA

LOOP ANTENNAS

LOOP ANTENNA

LOOP ANTENNA

LOOP ANTENNA

LOOP ANTENNA

LOOP ANTENNA

LOOP ANTENNA

LOOP ANTENNA

LOOP ANTENNA

V-ANTENNAS

V-ANTENNA

V-ANTENNA

V-ANTENNA

ANTENNAS

Omni directional antenna

Figure 12: An omni-directional antenna broadcasts 360 degrees from the base station

Omni directional antennas are used for point-to-multipoint configurations. The main drawback to an omni directional antenna is that its energy is greatly diffused in broad-casting 360 degrees. This limits its range and ultimately signal strength. Omni directional antennas are good for situations where there are a lot of subscribers located very close to the base station. An example of omni directional application is a WiFi hotspot where the range is less than 100 meters and subscribers are concentrated in a small area.

Sector antennas

Figure 13: Sector antennas are focused on smaller sectors

A sector antenna, by focusing the beam in a more focused area, offers greater range and throughput with less energy. Many operators will use sector antennas to cover a 360-degree service area rather than use an omni directional antenna due to the superior per-formance of sector antennas over an omni directional antenna.

Panel antennas

Figure 14: Panel antennas are most often used for point-to-point applications

Panel antennas are usually a flat panel of about one foot square. They can also be a configuration where potentially the WiMAX radio is contained in the square antenna enclosure. Such configurations are powered via the Ethernet cable that connects the ra-dio/antenna combination to the wider network. That power source is known as Power over Ethernet (PoE). This streamlines deployments as there is no need to house the radio in a separate, weatherproof enclosure if outdoors or in a wiring closet if indoors. This configuration can also be very handy for relays.