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Antenna Characteristics
Different antennas are needed for different applications. An open office space is very different to to a strip of closed offices. How do you cover a large open area such as a lobby? Covering an outdoor area is different than an indoor one and so on.
Radiation Patterns
Antenna gain is normally measured against an isotropic antenna, measured in dBi. This antenna only exists in theory though. It’s shaped like a tiny round point that when alternating current is applied, radiates a signal equally in all directions, in the form of an ever-expanding sphere.
The relative signal strength around an antenna, showed on a plot, is known as the radiation pattern.
The radiation pattern can be shown in a three-dimensional plot in form of a sphere where XY plane lies flat along the horizon and the XZ plane lies vertically along the elevation of the sphere. The first plane is referred to as H plane, horizontal, or also as the azimuth plane. The second one is known as the E plane, elevation.
Polar plots can also be used where concentric circles represent relative changes in signal strength as measured at a constant distance from Continue reading
The server revenue declines were primarily attributed to a single Tier 1 customer.
Verizon and AT&T exit the cloud business; Cisco acquires SD-WAN vendor Viptela for $610 million.
MSPs can now rebrand the security platform.
Another piece of Brocade's IP networking business has been claimed.
Ericsson played a role in helping Verizon set up its managed SD-WAN service.
In the previous blog, we investigated the basic feature set of NSX Load Balancing, some of the business reasons to use it, and deployed an ESG (Edge Services Gateway), the NSX load balancing platform. Today, we are going to setup our first virtual server. When we look at load balancing, it operates at the Transport layer or above of the OSI model and is inclusive of the network layer. In the most basic of terms, Load Balancing looks at a “session” from the transport layer and applies a load balancing algorithm and a NAT policy to the traffic. I put “session” in quotes because we can load balance both TCP and UDP based applications, but UDP does not have a stateful session, but we can still load balance UDP services.
Whenever someone has stated that and given application cannot be load balanced, I first ask them if the traffic can be processed by a NAT at either the client or server end. If the answer is yes, odds are that it can be load balanced with sufficient understanding of the application and the required ports, protocols and persistence to make the application function correctly. This is Continue reading
While most network engineers do not spend a lot of time thinking about environmentals, like power and cooling, physical space problems are actually one of the major hurdles to building truly large scale data centers. Consider this: a typical 1ru rack mount router weighs in at around 30 pounds, including the power supplies. Centralizing rack power, and removing the sheet metal, can probably reduce this by about 25% (if not more). By extension, centralizing power and removing the sheet metal from an entire data center’s worth of equipment could reduce the weight on the floor by about 10-15%—or rather, allow about 10-15% more equipment to be stacked into the same physical space. Cooling, cabling, and other considerations are similar—even paying for the sheet metal around each box to be formed and shipped adds costs.
What about blade mount systems? Most of these are designed for rather specialized environments, or they are designed for a single vendor’s blades. In the routing space, most of these solutions are actually chassis based systems, which are fraught with problems in large scale data center buildouts. The solution? Some form of open, foundation based standard that can be used by all vendors to build equipment Continue reading
AI, machine learning driving new security strategies.