FabFi Site Summaries

From Fab Lab wiki

FabFi Node List

This page may lag behind reality. For more photos go HERE.

Contents 1 Base Station, the FabLab 2 Public Hospital Water Tower 3 Public Hospital Administration Building 4 OPM 5 Bagrami Village 6 IOC 7 The Triple Nickel 8 DLS 9 RN 10 HT 11 RH 12 RS

Base Station, the FabLab

The Fablab serves as the uplink to the web for FabFi Jalalabad, including the MIT Open CourseWare mirror. It makes direct links to the Public Hospital water tower and Bagrami village.

The footlocker contains the central routing hub for all the FabFi links, and power from a UPS. The large reflector *link to large reflector file* is directed toward the water tower *direction*, and the small acrylic one *link to reflector file* points to Bagrami *direction*.

Public Hospital Water Tower

The Public Hospital water tower is the endpoint of the long-range backhaul link from the FabLab to Jalalabad City. It uses the same reflector as the FabLab side of the link for the backhaul, and provides downlinks to both the Public Hospital administration building and a local NGO through two small wooden reflectors *link to small wooden reflector*. Specs on the back-haul link at setup were:

• Jalalabad City District 3
• Distance: 3,880m
• Signal Strength: -67 to -79 dBm, weather dependent. Nominally, it is about -72 dBm
• Noise Floor: -92 dBm
• Throughput: 11.4Mbps (link speed, not internet)

Public Hospital Administration Building

The public hospital Admin link serves net to the entire hospital administration building by linking the FabFi endpoint to a wired switch.

• Jalalabad City District 3
• Distance: 57m
• Signal Strength: -41 dBm
• Noise Floor: -95 dBm
• Throughput: untested

OPM

This link is also fed from the water tower on channel 11.

• Jalalabad City District 3
• Distance: 326m
• Signal Strength: -68 dBm
• Noise Floor: -92 dBm
• Throughput: 1.8Mbps (to internet)

The signal strength is affected here by the placement of the tower-side reflector away from the edge of the platform on the water tower (see small reflector in water tower photo above). This was done deliberately because it eased the lashing of the reflector to the platform and the signal margin was available.

Bagrami Village

The link to Bagrami features the 18" acrylic antenna design (version 0.1) that was created in the Jalalabad FabLab. A second router was also added to provide a local wireless net for the school, the roof of which is home to the reflector. Bagrami will be using the net to do teacher training with OLPCs

• Bagrami (suburb to the west of Jalalabad City)
• Distance: 375m
• Signal Strength: -65 dBm
• Noise Floor: -92 dBm
• Throughput: untested

The lashing job pictured at left was improved markedly in the final installation...

IOC

The link to the IOC school features the 18" acrylic antenna design (version 1.0) that was created in the Jalalabad FabLab. This is the first link that has been made with the FabLab crew absent, and we're very proud of the local talent!

• Jalalabad City District 3
• Distance: 167m
• Signal Strength: -70 dBm
• Noise Floor: -94 dBm
• Throughput: untested

The Triple Nickel

• Jalalabad City District 4
• Distance: 3800m
• Signal Strength: unrecorded
• Noise Floor: unrecorded
• Throughput: untested

DLS

• Jalalabad City District 3
• Distance: <500m
• Signal Strength: unrecorded
• Noise Floor: unrecorded
• Throughput: untested

RN

• Jalalabad City District 2
• Distance: 3500m
• Signal Strength: -85dBm
• Noise Floor: -94dBm
• Throughput: 1.5Mbps

HT

• Jalalabad City District 3
• Distance: ~1000m
• Signal Strength: unrecorded
• Noise Floor: unrecorded
• Throughput: untested

RH

• Jalalabad City District 3
• Distance: ~600m
• Signal Strength: unrecorded
• Noise Floor: unrecorded
• Throughput: untested

RS

• Jalalabad City District 3
• Distance: ~400m
• Signal Strength: unrecorded
• Noise Floor: unrecorded
• Throughput: untested

Fabfi node list

Wtgphoben 18:51, 24 March 2009 (UTC)