Monday, June 18, 2012

Wednesday Plans: 3-Point Testing

Mostly for the benefit of J's friends Ben and Julian who are helping with the testing on Wednesday:

The goal: to set up a three-point Internet link in which we broadcast Internet signal from the first point and give Internet access to the third point (which normally wouldn't have it). The first point will have a large directional dish antenna broadcasting the signal directly to a midpoint antenna that receives and broadcasts in all directions- the midpoint is the one you'll be manning. The third point will also have a directional dish antenna receiving signal from the midpoint antenna. (I'm using the terms "broadcasting" and "receiving" to refer to the Internet access; in reality, all the antennas are both sending and receiving signals in the process of communicating.)

At the midpoint, you won't have to do any aiming; while the two endpoints move around and try to find the best angle to point our antennas at, you should stay in the same place and keep the antenna oriented vertically. (The only exception is if the connection isn't working and you see some object blocking the lines of sight between our locations and yours; then we might ask you to move.)

The setup: You'll have in your possession a portable battery pack, into which you should plug the Power over Ethernet (POE) converter (the little black box-looking thing that has one or more Ethernet cables coming out of it). The POE converter's "POE" jack should be connected to the Bullet modem (cylindrical tan device) via an Ethernet cable, and the Bullet should be connected to the antenna. (We'll make sure everything is connected okay before we begin.)

This will be the order of the testing locations:

Test 1: Tang Hall (broadcasting) to MIT West Parking Garage (midpt) to MacGregor (receiving)- 1.15 km total
Test 1a. If Test 1 works, the next test will be Tang to Parking to Tang side field- 1.25 km total
If this works, we're done!

Test 2. If Test 1 does not work, we will try Tang to Simmons to MacGregor- 0.61 km total
Test 2a. If Test 2 works, we will troubleshoot Test 1 and try again.

Test 3. If the previous two fail, we will try Tang to Tang side field to MacGregor- 0.36 km total
Test 3a. If Test 3 works, we will troubleshoot Test 2 and try again.
If this doesn't work, we will think very hard and try to figure out why.


Example test route: Test 1, from Tang to MIT West Parking Garage to MacGregor dorm

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