Skip to main content

Microwave Backhaul Connects American Samoa

Earlier this year, Ericsson published an interesting case study about American Samoa. Quoting from the report:

American Samoa Telecommunications Authority, ASTCA, supplies telecommunication services to the residents of the American Samoan islands, a territory of the United States, which are found in a remote area of the Pacific Ocean. The primary backhaul system between the islands consists of fiber-optic cables and satellite connections. Over Independence Day weekend 2021, the undersea fiber-optic cable linking the Tutuila and Manu’a Islands failed, completely stranding the Manu’a Islands from all telecommunication services.

ASTCA selected Ericsson in 2019 to provide a high-capacity wireless backup system to the existing fiber-optic network between the islands. One of the planned microwave links was to connect the island Tutuila to the Manu’a Islands with a challenging distance of 84.23 miles (135.55 km). To put this into perspective, it’s the same distance as between New York City and Philadelphia.

Adding to the challenge was the fact that more than 95 percent of the link was over water with a high probability of multipath reflections that could degrade link performance. The solution was to use MINI-LINK 6291, a long haul split-mount system, with 6L GHz frequency, 2+0 with space diversity and with ACCP.

The MINI-LINK 6200 microwave product family combines multiple channels to create a trunk radio link while keeping low loss on the link budget. With low losses, the link can achieve long distances with high microwave capacity of up to 10Gbps while maintaining high availability.

Ericsson’s long-haul systems utilize the frequency range of 6-13 GHz, providing best-in-class spectrum efficiency and maximizing available frequency spectrum.

Ericsson received an urgent call on July 4 to get the microwave link between Tutuila to the Manu’a Islands up and running immediately – well ahead of the planned schedule. This was a challenge as the American Samoa islands are very remote and COVID-19 travelling restrictions were enforced. As much of the preparations were already in place, the Ericsson team could get the link installed with the local ASTCA team providing the installation of the microwave dishes and alignment with Ericsson’s remote support and guidance. Telecommunication services was then restored to the people of Manu’a islands. The link is now providing a steady 1Gbps backhaul most of the time of the year with 600Mbps at four 9’s availability, over this extremely long distance.

You can also download Ericsson Microwave Outlook report 2022 report here.

Related Posts

Comments

Popular posts from this blog

Laser Inter-Satellite Links (LISLs) in a Starlink Constellation

When we first talked about Starlink back in 2019 , we saw in the video that the concept involved laser communication to communicate between the satellites. While the initially launched satellites did not have the laser communication mechanism built in, it looks like they are being added to the newer ones.  A report from Fast Company in late 2021 said: One of the next big upgrades in telecom will involve satellites firing lasers at each other—to beam data, not blow stuff up. The upside of replacing traditional radio-frequency communication with lasers, that encode data as pulses of light, can be much like that of deploying fiber-optic cable for terrestrial broadband: much faster speeds and much lower latency. “Laser links in orbit can reduce long-distance latency by as much as 50%, due to higher speed of light in vacuum & shorter path than undersea fiber,” SpaceX founder Elon Musk tweeted in July about the upgrade now beginning for that firm’s Starlink satellite constellation. The

CSI-RS vs SRS Beamforming

In an issue of Signals Flash by Signals Research Group (SRG), they talked about 2 different types of MIMO. Quoting from their journal, "CSI-RS versus SRS. Those operators that have tested or made token use of MU-MIMO leverage a flavor of MU-MIMO that is based on CSI-RS. The MU-MIMO network we tested was based on SRS, which makes it far more likely to observe sixteen spatial layers (versus eight)." I reached out to Emil Bj√∂rnson, Visiting Professor at KTH Royal Institute of Technology and Associate Professor at Link√∂ping University to see if he has explained this in any of his videos. Here is what he said: " I'm not talking about 3GPP terminology in any of my videos. But you can listen to the slides that starts around 12:40 in this video (embedded below) . If you are looking for CSI-RS vs SRS based MU-MIMO, then jump to around 12:40 in this video where you can see CSI-RS being referred to as "grid of beams" and SRS is similar to the other option, which is t

IEEE 802.11be Extremely High Throughput (EHT), a.k.a. Wi-Fi 7

We have been writing about Wi-Fi for a long time, weather it's to do with indoor connectivity , competition with 5G or just a name change to something simpler. When we last wrote about WiFi 6, a.k.a. 802.11ax, we were expecting a quick adoption of the technology in the industry. We are still not there yet.  You know what's strange? None of the new @madebygoogle gadgets from yesterday support Wi-Fi 6. Not the Pixel 5, not the Pixel 4a 5G, not the Nest Audio, and not the new Chromecast. pic.twitter.com/QtJ8iB9FeO — Ry Crist (@rycrist) October 1, 2020 Take for instance the new iPhone 12 supports Wi-Fi 6 in all their models as one would expect but none of the new Google Pixel phones (4a, 4a 5G and 5) support it. In fact none of the new Google devices support it. Which is rather bizarre. While we are still looking forward to Wi-Fi 6 becoming widespread, IEEE has already started working on the successor of 802.11ax, 802.11be - Standard for Information technology--Telecommunicati