By Ramon Morales, NOC Operations Team, US
It’s 2:30 AM Saturday morning and the phone rings dragging you out of a deep sleep. Groggily you answer the phone and a voice at the end of the line is alerting you that the communication system is in alarm and traffic is down. While trying to figure out what’s going on, you remember you are the person responsible for your company’s communication infrastructure.Read More
There’s no one-size-fits-all in microwave. Each radio architecture comes with tradeoffs, so you need to weigh the choices in each segment of the network to get the right product mix for your business. To determine your best solution, first establish your requirements from a capacity, reliability, operational, and cost perspective. Then choose the right product. Microwave’s major technologies include the following.Read More
By Ramon Morales, NOC Operations Team, US
Do you remember the last time your blood pressure was checked? I remember staring at the results wondering what the numbers meant. Usually my thoughts are, “Great, does this mean I’m healthy or should I be concerned?”
Recently, one of our customers had a similar experience with an email received from our customer service group. The customer’s initial impression was that the content received was vague and meaningless. “What am I supposed to do with this information?”, the customer asked.Read More
Cisco routers remain the backbone of internet connections worldwide. Deep in the heart of networks, core routers perform the essential plumbing of the web. Further out on the edges, access routers provide connectivity for mobile devices via microwave radios (many of which are Eclipse radios from Aviat Networks). Generally, routers assume a full 1 Gbps bandwidth capability between Layer 2 connections provided by microwave radios.
However, modulation and channel size selections can vary the actual bandwidth between 1 Mbps and 1000 Mbps (i.e., 1 Gbps). This can also happen when Adaptive Coding Modulation (ACM) is activated on a point-to-point microwave link and the link’s bandwidth varies based on propagation conditions. If congestion occurs on the link, the router cannot quickly prioritize traffic nor select the optimal path, resulting in possible “black holing” of critical traffic.Read More
Aviat Networks has been there all along the way, helping operators design and deploy aggregation systems. We’ve seen and learned a lot as some of the leading mobile phone carriers have upgraded their networks. Now as LTE works its way into mainstream status, cell phone networks are transitioning to full-IP, the underlying technology of LTE.Read More
Link between Honduras and Belize Crosses Water and Land
Last year I wrote about the world’s longest all-IP microwave link, stretching 193 km over the Atlantic Ocean in Honduras. Aviat Networks and Telecomunicaciones y Sistemas S.A. (TELSSA) designed and implemented this link together. This year, Aviat Networks and TELSSA again worked together to build another link and achieve another record—an Eclipse microwave link between Honduras and Belize that crosses 75 km of the Atlantic Ocean and 105 km of rugged terrain for a total path length of 180 km. This is a new world record for a hybrid diversity microwave link!
After the success of implementing the 193km link over water, Aviat Networks and TELSSA were eager to meet the challenge to connect Honduras and the neighboring nation of Belize using a single microwave link. Aviat Networks network engineers and TELSSA engineers were able to use their extensive knowledge of local propagation conditions, thorough understanding of long path design principles and precise installation practices to successfully implement this 180km microwave link.
Long Path Design Considerations
As outlined in the article last year for the longest all-IP hop, a deep understanding of path design considerations and experience in microwave transmission path design are necessary to successfully complete a long path design. Key considerations involved:
To read more about this world-record Hybrid Diversity IP microwave link, download the full article.
Senior Network Engineer
Like the Interstate Highway system in the 1950s, building out a national LTE infrastructure in the U.S. is a major undertaking. The largest challenges in building out an LTE network consist of planning, staging and deploying the technology at maximum speed and with minimal costs. Mobile operators are in a tight race to build out LTE networks in the U.S. as quickly and cost-effectively as possible, and backhaul is a key component of the job.
There are more than 300,000 2G/3G cell sites in the United States; LTE penetration is at approximately 50,000 sites today. Mobile operators want to have 95% of their footprints covered with LTE within the next year or two, so a massive construction project lies ahead with a tight timeframe for completing it…see the entire article at Telecom Engine.
Senior Product Marketing Manager
As we blogged last summer, the FCC has released 650 MHz of new wireless technology spectrum for Fixed Service wireless communication technology operators. Now Comsearch, a leading provider of spectrum management and wireless engineering services in the US, has highlighted this issue in its latest online newsletter, with an article that includes some very informative coverage maps showing the zones where the new bandwidth is available.
These maps are excellent at conveying the limitations of the newly released spectrum for microwave link applications in the 7 GHz (6.875–7.125) and 13 GHz (12.7–13.1) bands. After taking into account the zones that are reserved for existing Fixed and Mobile Broadcast Auxiliary Service (BAS) and the Cable TV Relay Service (CARS) users, these new bands are only available in about 50 percent of the US land mass covering only 10 percent of the population.
What do you think? Should the FCC loosen the spectrum sharing rules even more for 7GHz and 13GHz bands? Take our poll and tell us:
To compare how different wireless backhaul network topologies perform under the same operating scenario, let’s analyze how a traditional hub-and-spoke and a ring configuration compare in connecting the same six sites (See table below). For the hub-and-spoke configuration, each cell site is provided 50 Mbps capacity in 1+1 protection. With five links and no path diversity, full protection is the only way to achieve five nines reliability. In this configuration, 10 antennas are employed, which average a large and costly 5.2 feet in diameter. Total cost of ownership for this six-site network is close to $700,000 for five years.
For a ring design for the same six sites, throughput of 200 Mbps is established to carry the traffic for each specific hop and any traffic coming in that direction from farther up the network. Designed to take advantage of higher-level redundancy schemes, the ring configuration only requires antennas that average 2.3 feet in diameter, which are much lower in cost compared to the antennas in the hub-and-spoke configuration. And even though the ring configuration requires 12 antennas and six links, its overall TCO amounts to a little under $500,000 over five years—30 percent less than TCO for the hub-and-spoke design for the same six sites.
This comparison is based upon deployments in the USA, where most operators lease tower space from other providers.
Senior Product Marketing Manager