Two wires? What to do

A long time ago SDSL technology was the new thing. . . it brought high speed internet to thousands of consumers, all using only two wires of the phone line. Fast forward to 2019 and you still may find a need for sending data over phone lines (two conductors). What can you do? Try using a bridge/media converter like the ones they sell at PlanetTech USA. PlanetTech is a local seller (Southern Califiornia) of network technology. This device will allow you to move data over two wires, farther than a mile away! Need a link farther than a mile away? What to do? I am unsure, but usually DSL will also send data farther, yet speeds will decrease. We would have to ask PlanetTech people to be sure.

The BNC / coaxial connection can be used or simply use a connector for your two wire data line. Remember two wire data lines in the world of ethernet are not possible! Let us review, you need at least four conductors to send 100 megabit ethernet data/packets. And recall that the range is? It is limited to a few hundred meters. What about two wires? Using two wires, with HDSL, or VDSL, the range is almost ten times greater!

These VDSL converters will need to be bought as a pair to make a point to point link (or bridge).

https://planetechusa.com/vc-232g-1-port-101001000t-ethernet-over-coaxial-converter/?gclid=CjwKCAjwqLblBRBYEiwAV3pCJkuksHAxRl9GvYGhiYt7jTY_Svc3yDJVCSD1qdpy7v_-aDOgiG57jhoCmNsQAvD_BwE

sales@planetechusa.com

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cisco control-plane

If you setup a new router,  you might see that this command is near the end of the running-config:

control-plane

Alone that command does little, but with a preceding policy statement, it can make your router more secure,  and possibly less prone to overload of the control-plane.   If you don’t fully understand the control-plane of a Cisco router -or- you don’t recall what a CEF function is,  read this article that describes it:  neat Cisco link about router functions 

Test question, what does the CEF do?

ACM Papers

You know ACM, right?  A wireless special interest group awarded a special nomination to the guys who wrote this paper.  An experimental idea, a revolution in process, an ad-hoc building of a network?   This is what they wrote.  Experimental things are awesome.

I’d like to see layer 1 signaling indication,  like a RSSI level, that is part of the route updates.  I think without this,  you have certain performance issues?  Perhaps if layer 1 and processing is fast enough,  then irrelevant?  Hard to say until it is tested.

This  revolution?  Yes

A communications protocol, called AODV, was ahead of its time.  Only now in 2019.  Only now are the networks capable to make something like this be useful.

All the components exist now!  But they did not exist in handsets 9 years ago!

The modern handset now has the power.   Radio power, spectrum efficiency, and CPU processing.

I would love to see this protocol in action.

It can only be done now with modern handsets!

https://www.sigmobile.org/grav/awards/test-of-time-paper

Click above link, then look at 2018 awards,  paper by Charles E. Perkins and Elizabeth M. Royer.

Need drones to talk to swarms of drones?  This process might help. As verbatim from the paper, they say:

The AODV routing protocol is designed for mobile ad hoc networks with
populations of tens to thousands of mobile nodes.  AODV can handle
low, moderate, and relatively high mobility rates, as well as a
variety of data traffic levels.  AODV is designed for use in networks
where the nodes can all trust each other, either by use of
preconfigured keys, or because it is known that there are no
malicious intruder nodes

One of the challenges of these protocols is link flapping,  meaning layer 1 communications is intermittent.   AODV manages this only per interface.  Any simulation of this protocol?

And if you want to read up on more distance vector protocols, see this one, another distance vector routing protocol.  Request for Comments: 3561.

https://tools.ietf.org/html/rfc3561

2019 Rod Deluhery

Fiber distribution

I found several hundred feet of clearfield fiber cable!  It has 10 color coded fibers.  They call it fieldshield model cable.  In the clearfield videos they show cables with partial connectors.  This way you do not need a fiber fusion splice.

It  came to me, the reason the telco company threw away the fiber!  One or more of the fibers broke, and they are not trained to splice fiber.  Also they may not have the 7000 dollar splicer tool.  There are some splicing techniques that use a gel to field repair cables.  Only fiber fusion splicer can do the job with the lowest decibel loss in power.  Light power.  Fusion splices like the ones created by Fujikura are good:

https://www.fusionsplicer.fujikura.com

Splicers will also have heaters to shrink the heat shrink tubing, needed to protect the fiber.

 

Cisco tech contest.

First person to email what this means gets a free Cisco magnet, worth $25.00.  Or choose any item with $25.00 of value, from this cisco store

Contest starts now on December 8th, 2018 at 9:00pm pst.

contest rules:   email me (rod.deluhery@gmail.com) with the answer to this question.  What the heck does BIDI mean, in regards to high tech communications gear?

Hint:  Cisco has used this technology widely since 2014,  I know that for a fact.   Yet still many technicians have not ran across this beast.

troubleshooting slow WAN

In troubleshooting a WAN, you must be aware of the latency and its affect on speed.  You also must be aware of tcp windows and how they work, and if they are working correctly.  Use a packet capture tool to find your TCP window settings as the data is being pushed.  Check your clients and servers that they have correctly setup tcp parameters.  For some information on windows server parameters, check the microsoft link below. There is also a TCP networking book that the author mentions.  Wait, do you need to read a book to know TCP?  Well you actually do, tcp\ip is that complicated!

For specific help with WAN, call us @ http://www.networksetup.com

https://blogs.technet.microsoft.com/netgeeks/2018/05/21/a-word-about-autotuninglevel-tcp-receive-auto-tuning-level-explained/