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Network Performance

I realize this post assumes more technical knowledge than many of my readers possess. In the pre-COVID-19 era, my grandson Chris and I held free consultation sessions at the Ferndale Public Library to help folks over technical hurdles. We’re working with the Whatcom County Library System to resume these sessions online. I’m in several COVID-19 hyper-vulnerable categories and do not plan to resume in-person sessions until the viral landscape changes significantly, but Chris and I miss our library sessions and hope to get something going online soon.

An image in a Zoom meeting pixilates into a messy checkerboard of colored squares. Or the screen freezes. Or a voice sounds like a chef is chopping it up and throwing it on a sizzling griddle.

These, and a hundred variations, are network performance issues, which, from an engineering standpoint, can be reduced, but never eliminated.

You may find it hard to believe, but these visual and audio burps demonstrate the computer network’s reliability. The web we experience today is an engineering miracle that has transformed a ramshackle collection of unreliable and inconsistently implemented subnetworks into a reliable global service. Unlike a traditional phone connection, which is essentially an unbroken wire from one user to another that either succeeds or breaks, computer network connections steer their own path like a car on a cross-country drive taking detours and switching highways, slowing down and speeding up as conditions change, but never stopping. Instead of failing, the network recovers and corrects itself with these gyrations.

Great. Wonderful. But we all want the broken images and garbled sound to go away.

Here are some fixes. Most are not expensive. 

Network speed check

Start with a speed check. There are many free speed checkers available. Google “free network speed check” and take your pick. Follow the simple instructions (press GO.) In half a minute or so, you’ll get a download and upload rate in MBPS (MegaBytes Per Second). You may also get a Ping time in milliseconds, (ms), but it’s the upload and download rates you want. Most aggravating problems are with downloads. An upload of a large file like a video that takes five minutes is not nearly as painful as a garbled movie image or a messed-up Zoom meeting, which are almost always due to slow downloads.

Note, however, a full-on home office may need fast uploads. Businesses pay extra for fast uploads. If you find yourself losing valuable time waiting for files to upload, a business network connection will cost, but it should solve the problem. Premium residential service probably won’t help.

We have comparatively good network service from Comcast here in Ferndale. That’s because the Comcast infrastructure here is fairly new and reliable. Other areas may differ. At the moment at our house, downloads are about 400 MBPS, upload 20 MBPS. This is good for residential service. Disregard theoretical 1000 MBPS promises. Theory is wonderful, but practice is what you get for your money.

Your internet service provider

If you have speeds substantially below ours, call your internet service provider. (Comcast, Frontier, etc.) Something may be wrong that they can easily fix with a reset or reconfiguration. At worst, they will try to sell you premium service. Ask for a free upgrade. You might get one. For internet service providers, losing a customer is often a greater loss than a free upgrade. Internet service providers often comp and discount freely to avoid completely losing your monthly payment. When 5G cellular comes online your negotiating position is likely to get even stronger.

Secrets

Now, I’ll let you in on a few secrets. Your real performance may depend more on your home network than your internet service provider. If you have a typical broadband connection, you have a modem and router attached to a television or telephone cable coming into your house. The modem separates the computer network signal from the incoming signals and converts it to the Ethernet signal used by your computing devices. The router distributes Ethernet signals to your devices. Almost all residential routers emit radio waves (Wi-Fi) that link the router to your computers, but they also have sockets (typically four) that you can use for cabled connections. These days, modems and routers are usually combined into a single device.

Modem-routers

If your modem-router is old, you might need a new one. In the computer world, newer means faster. If your modem- router is more than five years old, a replacement will almost certainly improve your performance. I use 18 months as a rule of thumb for replacement. If you got your modem-router from your internet service provider, ask for a free upgrade. They want you as a customer.

Wisdom is that you can get a better deal by purchasing your own modem-router, but the internet service providers prefer to support their own equipment and they will fight you on it. You have a legal right to use your own equipment, but, in my experience, the providers are more likely to offer a free modem-router than cease trying to charge you for using your own.

Upgrading the software on your modem-router may help performance and some serious security issues with home modem-routers have been corrected recently with software upgrades. If you can, it’s safer to opt-in on automatic upgrades.

Ethernet cables vs. Wi-Fi

When it’s possible, I use an Ethernet cable rather than a wireless connection to devices. On our home network, a cabled Ethernet connection is ten times faster than a Wi-Fi connection. Cables are their own form of torture, but they perform better.

Our house, which is only two years old, was wired with CAT6 ethernet cables but not set up to use them. When we moved in, my grandson Christopher and I worked on our inhouse cabling. Now, we can plug into wired Ethernet anywhere in the house we want. There are lots of YouTube tutorials on Ethernet home wiring if you have the DIY bent. A few special tools are almost a necessity for DIY, but you can also have the wiring done for you. If the wires are already in the walls, a pro can finish the job in a few hours. Typically, you can add an Ethernet socket to all your television cable outlets.

If you want more connections than the usual four on the router, get an unmanaged Ethernet switch, which will branch a single socket to multiple sockets. Avoid “hubs.” They also multiplex Ethernet connections and are sometimes cheap, but they are old and slow technology. Managed switches are for network engineers, not residences.

In my office I have an unmanaged five-port switch I bought from Amazon for a little over ten dollars. Connected to a single Ethernet wall socket, the switch yields four fast network connections.

If your house is not wired for Ethernet and you don’t want to spend much, you can buy premade Ethernet cables to run on the floor like extension cords from your modem-router. Shop around for cables. Prices vary. Avoid trip hazards, be neat, and don’t use cables that are longer than needed. If you coil the excess, strange interference patterns can cause erratic performance. Use switches to provide more fast remote connections than the four on the router.

Wi-Fi

Typically, you still need Wi-Fi for tablets and phones, although I sometimes use a USB-Ethernet cable adapter with my Surface tablets.

There are some tricks you can try with wireless when you have performance issues. The cheapest and easiest is to move around. Wi-Fi signals pass through most walls, but metal objects, like a water heater or other appliances can slow a signal down. High current appliances like starting air conditioners or furnaces also affect radio signals, which can explain fluctuating performance. Try to locate your modem-router centrally and close to the areas where network performance matters most.

If a Wi-Fi signal is unreliable in the perfect spot for your home office, don’t despair. Current standard Wi-Fi uses two channels: 2.4 GHz and 5 GHz. The 5 GHz channel is faster, but it does not penetrate walls well and it has a shorter range than the older 2.4 GHz channel. Routers today default to 5 GHz and reserve 2.4 GHz channel for old devices that can’t access the 5 GHz channel. If your perfect spot is in a remote corner, you may get better performance if you configure your router to use the 2.4 GHz channel for the device you use in your perfect spot even if it will work on 5 GHz.

If your home network covers a large area, you may want to look into a “mesh” system that emits Wi-Fi signals from more than one source. These are a more effective version of the Wi-Fi repeaters that were touted as range extenders a few years ago.

Tri-band routers have two 5 GHz channels and one 2.4 GHz channel. The router distributes 5 GHz devices over the two fast channels. Decreased congestion on the fast channels improves performance. If your biggest problem is distance, go with a mesh. If you have a ton of contending devices, get a tri-band.

Don’t just shrug your shoulders when you have network performance issues. You have a good chance of improving your experience.

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Masks For a Hard-Headed Dutchman

In my carpenter days, I thought I was a hard-headed Dutchman who feared nothing. My mother’s family is Lynden Dutch from the Netherlands. Outside Whatcom County, a Dutchman is usually a person of German descent. My father’s family is from Prussia, home to the hardest headed Germans. Both families were stubborn dairy farmers accustomed to hard work and bad weather. They formed their own opinions and stuck to them. I was turned out from a tough and hard-headed Dutchman mold.

Back in the late 70s, I was a carpenter. Sometimes I got orders to wear a mask, but I avoided them whenever I could, although I knew full well that masks were self-protection and for my benefit.

I didn’t need any stinking masks. I knew I was supposed to wear a carbon filter when I worked with hot solvents like acetone and lacquer thinner, but I was young and tough. Once, I had a job installing a Formica bathtub surround. I’ve installed acres of Formica laminate and my process was down pat. Paint the wall and the Formica with contact cement and let it dry, releasing clouds of solvent. Use thin strips of waste to separate the laminate from the wall until the surround was positioned perfectly, then pull the strips and roll the laminate down tight. I applied the cement, waited, then began to wrestle the surround into place, inhaling solvent fumes. My head started to swim, and brown clouds rushed in from the sides. I stumbled, opened a window, and turned on the exhaust fan as my vision constricted to a foggy tunnel. Fortunately, fresh air cleared my head and I was able to finish the installation.

At the time, I was proud of myself. I came through a tough spot and delivered a good job. Forty years later, I have a different opinion. I was a stupid kid who was lucky to have survived. The only good thing I can say is that I endangered myself, no one else.

In those days, I was also not as careful as I should have been around asbestos, which was all over construction sites back then. Not too long ago I heard of another tough Dutchman, a skilled craftsman whom I admired. He was my foreman on a few jobs. He died of asbestosis, a fatal lung disease caused by asbestos dust. Many of the carpenters I knew from those days are dead now, not all of them from lung diseases, but a fair number. My lungs are still good, but that’s luck, not being tough. I should have been more careful.

Forty years later, I still have some of that hard-headed Dutchman attitude. Well, so what? We tough Dutchmen make our decisions and don’t complain about the consequences. That’s what tough means to me. Back in the day, I acted like a first responder who doesn’t take time to grab protective gear. Yeah. A foolish hero. I made bad decisions but I was the one I placed in danger.

Today is different. The kind of masks that most of us are requested to wear now do not protect the wearer, at least not directly. To start with, since COVID-19 is infectious before its victims have symptoms, anyone in an area where COVID-19 is active, unless they have tested negative for the virus in the last three days, can transmit the disease without knowing it. Some people spread the virus without ever getting sick. That’s why public health officials in some places ask everyone to wear masks.

Water droplets laden with virus are the villains. Breathing, talking, singing, coughing, and sneezing all project droplets into the air. These droplets break up and evaporate into even finer particles called aerosols that hold the virus and float up to six feet before most have fallen to the ground. In cold air, they float longer. The aerosols are so fine, they are inhaled right through a cloth mask. Breathe in enough of these minute virus-carrying packets and you are infected with COVID-19. A cloth mask blocks the droplets and prevents tiny aerosols from forming. Healthcare personnel and first responders, who must get close to infected victims, don special masks that stop the aerosols, but the cloth masks worn by the rest of us only keep the droplets in, which impedes the spread of the virus, but does not protect the wearer from aerosols coming from disease victims. People wearing masks protect each other. Remove your mask and you threaten your neighbor.

If enough people wear cloth masks, and follow other practices like social distancing, frequent hand washing, and surface disinfection, the spread of the virus will slow, and we will all be safer and the daily death toll will go down.

Heroes sacrifice themselves for others; selfish wretches hurt others for their own convenience.

Where does that leave a hard-headed Dutchman who wants to own his fate? He makes his choice based on what he has learned.

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COVID-19 Contact Tracing Training

I finished the COVID-19 contact tracing course from Johns Hopkins online last Friday. This Monday morning I was surprised to find an article in Wired by a journalist who has taken the same class, an article in the New York Times on the huge numbers of people who have applied to become contact tracers, and the MIT Technology Review had both an item on why contact tracing may be a mess in the U.S., and a piece on what it is like to be a contact tracer.

Sonofagun. Sandbagged by a zeitgeist.

The class was easy but contact tracing is not. When I started taking the class, I thought it might be a nice way to volunteer and do my bit in the pandemic crisis. But as I began to learn what a contact tracer does, I began to have doubts that I am tough enough to be a one. If an opportunity arises, I’ll give it a try, but I am not nearly as confident that I can help as I was before I took the class.

Washington State already has a robust contact tracing program in place. Close to 1400 tracers have been trained. Most are from public health services. Around 400 come from the state Department of Licensing which has been idled by the virus, another 350 are National Guard volunteers. I may still have an opportunity to volunteer because experts estimate 30 contract tracers are needed per 100,000 population, in other words, our state may need another 850 tracers. However, an arthritic C++ coder with no background in healthcare is not likely to be among the best candidates.

Contact tracing has been used for centuries for controlling infectious diseases. Recent victories over the Ebola, SARS, and MERSA epidemics are the result of contact tracing. Social distancing slows the spread, but contact tracing defeats epidemics.

Essentially, contact tracers question each person with COVID-19, discover whom they could have infected, phone each of these, warn them that they could contract the virus, and ask them to stay home until the danger that they will infect others stops.

A number of things make contact tracing a tough job. Sometimes, a contact tracer is the first to tell a victim that they have tested positive. Asking someone to stay home from work and away from their family is hard. Tracers also warn victims of symptoms like shortness of breath, chest pain, or turning blue (yes turning blue) that mean they may die soon if they do not get help immediately. Some people will need help getting food, paying bills, and getting child or parent care. None of this is fun.

COVID-19 has some nasty characteristics. Each infected person appears to infect 2-3 others, some estimates are higher. Hence the soaring number of cases and deaths in just a few months. At present, evidence shows that a person can infect others from 2 days before they get sick. The danger continues until they are well. If you are exposed to COVID-19, it can take as long as 2 weeks for symptoms to appear. In other words, you are a threat to others and should quarantine for two weeks after you are exposed.

Perhaps the scariest part is that you may never show symptoms and still pass the disease to others. Remember the Typhoid Mary story? She was a cook who had typhoid, but no symptoms. She refused to quarantine and continued to spread typhoid, leaving a trail of misery and death. This is why we should all wear masks when we are out and about and close to others. The mask prevents you from becoming a COVID-19 Typhoid Mary.

One of the reasons I feel compelled to volunteer is that the virus is so deadly. Best estimates are that people infected with COVID-19 die 2 to 3 times more often than flu victims. The flu kills 12 to 60 thousand Americans each year. And that’s with a vaccine. COVID-19 has killed over 90,000 in 4 months. Early on, it was said that the virus doesn’t affect children, but cases have turned up in which children get severely sick and a few have died. There is some evidence that death rates increase where more people are infected. That is, in ten square miles where 100 people are infected, 2 or 3 may die, but in the same area where 10 times as many are infected, many more than 20 to 30 die. We have to stop the spread of COVID-19.

As is to be expected in 2020, a robust contact tracing plan is accompanied with a haze of vicious misinformation. Isolation and quarantine, contrary to what is being said in some circles, is not mandatory. A National Guard volunteer may call you, but they are calling to trace your contacts, not to force you into quarantine. If asked, quarantine yourself to protect your family, friends, and neighbors from misery and death from the virus. But no one will force you to do the right thing. The information collected by a contact tracer is confidential like health records in your doctor’s office and your name will not be passed to your contacts.

This is the way contact tracing is done in a free democracy. Places under authoritarian regimes force victims to stay inside at gun point and publicly shame them. Not here.

On the other hand, for the time being, the authoritarians are doing much better than we are against the virus. They will be glad to take over if a free nation can’t handle COVID-19.