Wha What is an A t is an AREDN M REDN Mesh esh Ne Network! ork! - - PowerPoint PPT Presentation

Wha What is an A t is an AREDN M REDN Mesh esh Ne Network!

• rk!

Bob Nobis – N7RJN Tri-City ARA – March 19, 2018

The AREDN™ Proje ject’s focus is Eme mergency Commu mmunications (EmC mComm mm). It seek ). It seeks s to provide hams ms a me means to imp mpleme ment this technology in practical wa ways to support local and regional eme mergency commu mmunications needs.

Types of network T

• pography

• The internet is fault tolerant! If one path goes down there is another

path.

an adhoc wirel es s mesh routing daemon

W hat is OLSR ?

The Optimized Link State Routing protocol (OLSR) is a routing protocol that is optim ised for mobile ad-hoc netw orks but can also be used on

• ther wireless ad-hoc networks. It is a proactive

link-state routing protocol that floods a topology table of it's neighbors to all nodes in the network which then compute optimal for w arding paths locally.

Spectrum Allocations Multiple band plans EXIST !

• 13 Centimeters Band 2.4 GHz

(2300-2310 and 2390-2450 MHz)

• 10cm Centimeters Band 3.4 GHz

(3300-3500 MHz)

• 5cm Centimeters Band 5.8 GHz

(5650.0-5925.0 MHz) http://www.arrl.org/band-plan

2.4 GHz and 3.4 GHz

NOTE Broadband Modes, 2410.000-2450.000, 22 MHz max. Broadband segment may be used for any combination of high-speed data (e.g. 802.11 protocols), Amateur Television and other high-bandwidth activities. Division into channels and/or separation of uses within this segment may be done regionally based on needs and usage.

5.8 GHz (5,650.0 - 5,925.0 MHz)

Broadband segment may be used for any combination of high-speed data (eg: 802.11 protocols), Amateur T elevision and other high-bandwidth activities. Division into channels and/or separation of uses within this segment may be done regionally based on needs and usage.

Applications That Can Run On Mesh

• ANY program that runs on a TCP/IP network
• (exceptions: Bandwidth of the RFlink, Multicast traffic, internet access)
• VOIP PBXs (RPi image)
• IRLP, Echolink
• IP cameras (bandwidth allowing)
• Mesh Chat (web based group text chat that runs on the node or RPi)
• Ham chat (web page that runs on the node)
• APRS
• Incident command tickets
• Software defined Radios RX/TX
• Map cashing

Ubiquiti Hardware Used To Build A Mesh

Supported Platform Matrix

AREDN Status Window

AREDN Setup Window

• AL7MH Portable Mesh Node

AL7MH Portable Mesh Node (continued)

Google Earth AL7MH to N7RJN

AirLink https://airlink.ubnt.com/#/

Metro-Phoenix AREDN Nodes

Microwave Propagation

• LOS Line Of Sight & reflections off large surfaces like Buildings!
• Directional Antennas with GAIN!!!! With more gain comes a

directional pattern with noise rejection.

Cable

• Cat6 utp (unshielded twisted pair w/ crosstalk protection)
• Cat5e / Cat6a is ANSI/TIA-568-C.1 (crosstalk protection, unshielded)
• Cate 7a (Crosstalk and EMI protection w/ Overall Cable Shield )
• Shielded connectors
• Nodes shielded (Titanium models)
• Near field antenna separation.

Power Over Ethernet (PoE)

Nanostation Loco : sector coverage, low gain antenna. Nano Stations : sector antenna, ~ 11dbi of gain NanoBridge : Beam antenna ~ 18dbi of gain Rockets allows you to pick the antenna that your site needs, it will cost you a bit more. Ubiquity has great self-contained panel antennas.

Directional High Gain Antennas

AL7MH-N7RJN Experimentation & Testing

• Do some range testing - how far can nodes be separated

and still carry traffic?

• Get email working - Winlink Express
• IP Video
• Internet connection across an amateur radio mesh network.
• Internet tunneling
• VOIP
• File transfer
• Wifi Scan

Questions The AREDN web site has extensive documentation and a user forum https://www.aredn.org