Could this be among the projects for the coming year?

From what I have seen so far about the SheevaPlug it is a very compact (4.33″ x 2.74″ x 1.91″) plug computer.  The SheevaPlug comes as a development kit for $99.00

At PlugPBX Project they talk about a easy way of getting FreePBX / Asterisk working on the SheevaPlug.  The idea of creating a “plug computer” Asterisk Server that is portable is quite appealing.   Getting it to work with the RF Gateway may be a little challenging (primarily a power issue for operating the USB Radio Interface), but why not use this as a on-ramp to other RF Gateways?

Could always match the PlugPBX with High Speed Multi Media for Internet Access to a Remote Repeater / Base site.

Resource: PlugComputer.org

What is the function?

What will it be used for?

How will it connect to other stations?

What is the function:

A Remote Base provides a method in which locations outside the normal range of a Base Station or Repeater can be accessed. Thus providing additional communications coverage area.

What will it be used for:

Provide additional communications coverage area; also can be used to augment communications resources in emergency situations and special events.

How will it connect to other stations:

Depending on the complexity of the Remote Base (and the amount of funds available) the ideal situation would be to have a combination of RF and Internet backhaul capabilities. If Internet access is available this would be the ideal method for connectivity. Once again if funds are available use of Satellite Internet services would provide some additional remote accessibility.

When using RF backhaul capabilities there are number of methods that can prove to be beneficial. When possible consider VHF Links and for full-duplex A VHF / UHF combination. We cannot forget about the flexibility of HSMM on 2.4, 3.3, 5.8 GHz and even 902 MHz has some promising potential.

Can HF be considered a viable extension of the Remote Base Link? Depends on the mission objective. Looking back to some of the applications in the past couple of years where HF Remote Base Links have been used as a method to receive emergency traffic from distant locations out of normal range of EOC there may be some practical usage for HF.

The way the Amateur Radio licensing is set up it is rather tough to test a station in a non-emergency setting. Especially for those holding a Technician Class license. There are some that have taken the test for the General and Extra class license and passed the test yet don’t have a clue about the technology that they were tested on. It appears that some don’t really care about the technology just the fact that they can now “talk voice on HF.” In some instances voice on HF will not be the best approach for getting the necessary information from those that have it to those that need it.

Okay back to the Remote Base chatter …

So what do we need to create a Remote Base?

What do we need to create a Remote Base:

Determine the type of terrain in which the Remote Base will operate;

is it urban, rural, forested, hilly, mountains, etc.

What resources are available;

• Internet; Dial-up, Broadband, HSMM, Satellite;
• RF Equipment – HF, VHF, UHF, Microwave;
• Power – Grid, Solar, Wind, Battery, Generator
• Antenna Structure – Building, Tower, Mast;

What is the distance that needs to be covered between the Remote Base and Base / Repeater Site:

Will the distance require additional enhancements via extenders, cross-band repeaters, etc:

Once the above information is available we can start working on creating the actual Remote Base

711 is the nationwide telephone number for accessing Telephone Relay Service (TRS).    TRS permits persons with a hearing or speech disability to use the telephone system via a text telephone (TTY) or other device to call persons with or without such disabilities.

Making TRS Calls

If you want to call someone using TRS, use your TTY, or dial 711 on your telephone, and you will automatically be connected to a TRS operator. If you’re a TRS user traveling out of state and want to make a call, there is no longer a need to learn the state’s TRS provider’s telephone number.  Just dial 711. It’s fast, functional, and free.

The 711 code is not just for use by persons with disabilities. Both voice and TRS users can initiate a call from any telephone, anywhere in the United States, without having to remember and dial a seven or ten-digit access number. For persons who have been using TRS for years, the convenience of dialing three digits is obvious.

711 dialing access does not work for Video Relay Service (VRS) or Internet Protocol (IP) Relay calls, because such calls are initiated through the Internet. Hearing persons initiating a VRS or IP Relay call may do so by calling a provider’s 800 number.

Dialing 711 From A Private Branch Exchange

FCC rules require all telephone companies (including wireline, wireless, and payphone providers) that operate private branch exchanges (PBXs) to implement three-digit 711 dialing for access to TRS. A PBX is a private telephone system within an organization that switches calls between internal users and allows users to share a certain number of external phone lines. PBX operators are required to modify their equipment to enable 711 dialing to ensure that everyone benefits from abbreviated dialing and consumers have easy access to TRS.

Callers from locations served by PBXs may be required to dial 9 or another prefix before entering the 711 code or placing an outside call. The FCC encourages PBX operators to work with telephone companies and TRS providers to facilitate 711 dialing for users.

The FCC recently determined that providers of interconnected Voice over Internet Protocol (VoIP) service also must offer 711 abbreviated dialing.

911 and 711

Dialing 911 is the most familiar and effective way Americans have to find help in an emergency. The Americans with Disabilities Act (ADA) requires all Public Safety Answering Points (PSAPs) to provide direct, equal access to their emergency response services for people with disabilities who use TTYs or other devices. Therefore, in the event of an emergency, TTY users should call 911 directly, and not make a TRS call via 711.

Why is 711 TRS important to us?

As a communications resource we need to be ready to handle traffic that may need to be delivered to a person that may have hearing or speech.  Via 711 TRS we will be able to deliver messages in a more timely fashion when the situation arises.   We also need to let people know that the service exists.

Additional Relay Services

IP Relay – Internet Protocol Relay

VRS -Video Relay Service

Information Resources

711 Telephone Relay Service for the Deaf

FCC Dial 711 for Telecommunications Relay

i711.com

ip-relay.com

]]> http://asteriskradio.net/wp/2009/05/03/dialing-711via-pbx/feed/ 0 http://asteriskradio.net/wp/2009/04/29/digital-integration-to-pstn/ http://asteriskradio.net/wp/2009/04/29/digital-integration-to-pstn/#comments Wed, 29 Apr 2009 04:36:28 +0000 admin http://asteriskradio.net/wp/2009/04/29/digital-integration-to-pstn/ A new digital project is coming up that will provide a method to push digital radio traffic to SIP / IAX2 phones as well as PSTN. Testing is in progress now, more details coming soon.

1) HSMM capabilities at least in the 70cm band and even in 1.25m band.

2 ) Long range HSMM networks with data/video/voice capabilities. (With products like the Ubiquiti Networks Bullet [ubnt.com] should be able to get some decent range)

3) Low-cost Digital Interface that can plug into any radio with a data port (most new radios have a data port present, plus by regulation {at least for Part 90 equipment} they have to be able to handle at least 4k8 baud data – definitely not high speed, but it lets messaging take place).

4) Compact Rapid Deployment Links (RaDL) based on Asterisk that can be quickly delivered to any location thus providing phone and radio connectivity. ** Come up with a way to do it with the Gumstix Overo boards everything could fit in a radio. Add a Ethernet pigtail on the back of the radio one would have access to local SIP/IAX2 phone capabilities plus the radio could provide long-haul capabilities for at least one call to the outside world. Instant dispatch capabilities with the package too, along with intertie to other radio systems.**

The radio itself would work as a link/remote base anyone in the local network could connect through the LAN/wLAN to the RF side to transmit/receive via the radio itself. Plus they would still have local network capabilities. Since the original gumstix/Asterisk package was able to handle 10 to 15 calls, the new package should be able to increase that by at least to 15 to 20 calls.  Attach another wLAN to the RaDL would create another sub-network as well as capability for a second RF Gateway channel.

DARN defined as “to mend by weaving thread across a gap” that is what is being done. Those that want to see flexibility will go with the DARN approach, as a improvement while there will be others that find it to be just annoyance. DARN definitely fits the new Digital Analog Radio Networks.

Sometimes logic can indeed be simple (send in most potentially linkable exchange).

The Digital Analog Radio Network web site is located at http://darnsimple.net

The primary purpose for HSMM and Hinternet is to augment emergency communications via long range high speed wireless data networks that can handle voice, data and video communications. HSMM can also be used in the day-to-day aspects of Amateur Radio Communications.

The Fit …

With the rapid expansion of Asterisk PBX into the relm of radio communications the added flexibility of having a wireless linking system has also expanded.

It is now possible to have a network of repeaters and link stations that never touch a standard public switched telephone network, yet at the same time this network of repeaters and link stations has all the standard features one will expect to find with any telephone system.

By integrating HSMM along with Asterisk PBX a truly transportable network can be delivered to any location where communications is needed, with voice, data and video all being available to the agencies and organizations being supported.

Learn more about High Speed Multi Media (HSMM)

RtpDir bridge software(Real Time Protocol Director). RtpDir is a VoIP software for Amateur(ham) operators. It can also be used on other bands, Government, commercial and private nets, or direct user to user without any radios connected. If a band requires an FCC license, it is the responsibility of the end-user to obtain one. rtpDir runs on Linux or Windows platforms. NEW FEATURE: *Asterisk* app_rpt PBX interface.

Basic features:
================

• Runs as Echolink/Echolink conference, IRLP reflector/Echolink conference, Echolink+IRLP, private net.
• Accepts *Asterisk*/app_rpt connections
• Can transmit to *Asterisk*,IRLP,Echolink using computer mic or radio
• Graphical environment.
• DTMF control from Windows or Linux
• Remote text command control using ssh/Linux or PuTTY/Windows.
• Can TX/RX IRLP messages without the IRLP board.
• Any station can connect to rtpDir bridge. It does not have to be IRLP or Echolink
• GSM, ADPCM, LINEAR codecs are supported.
• Protocol conversion between IRLP, Echolink and *Asterisk*/app_rpt
• ADPCM —> GSM, GSM —> ADPCM transcoder included.
• DTMF processing internal(built-in) or External(hardware).
• Morse code IDs or Voice.
• COS “sensing” or VOX or both.
• Support for all link interfaces(sound mode or ASCII mode, VA3TO, WB2REM, G3VFP, G4CDY,…Rigblasters, MFJ, SignalLink,…)
• Mark a station as “Mute”, “Deaf” or “Mute and Deaf”.
• Timeouts for login, download, connection.
• Activity reporting.
• Audio recording and playback.
• RF station identification(audio, CW).
• Welcome message(audio, CW or text).
• Convert text to CW.
• Runs as server or client.
• Interfaces with external scripts.
• Runs with or without a soundcard.
• Audio signal strength indicator.

For more information about RtpDIR visit http://tech.groups.yahoo.com/group/rtpDir/