Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

51 posts

Master Geek

Topic # 29816 20-Jan-2009 14:29
Send private message

We have done a few customers EFTPOS over VFX  through SPA2102's, most work fine but I struck one that was a brand new terminal that simply refused to work.

I would love to hear success stories and nightmares, tricks and traps!

Are you confident in doing EFTPOS over VFX?

Create new topic
27476 posts

Uber Geek
+1 received by user: 6942

Biddle Corp
Lifetime subscriber

  Reply # 190804 20-Jan-2009 14:41
Send private message

While EFTPOS does work in a VoIP environment if you are encountering issues the simplest solution to get around the problem is to just move to an IP based terminal. Most vendors now have them.

3267 posts

Uber Geek
+1 received by user: 77


  Reply # 190817 20-Jan-2009 15:41
Send private message

We had an AC Neilson Home Scan terminal where you scan the bar codes of all your shopping and the terminal regularly uploads the data to their server.  It does not work over VFX at all, but being an electronic engineer I've tried various things.  In the end I got it working perfectly by simply connecting an ADSL line filter between the terminal and the VFX router.  My theory as to why it worked is that the modem assumes you are connected to a normal phone line and thus expects the signal to already be bandwidth limited.  But the router does not provide you with that and also assumes the signal you put into it will be bandwidth limited.  Then when the ADC and DAC (analogue to digital and digital to analogue converter) samples the signal you get image frequencies etc.  Long story, but basically you need to sample fast enough to capture the highest frequency in your signal or else low frequencies will appear where there were none (Nyquist sampling criteria).

An ADSL line filter is a simple way of limiting the bandwidth, easy to try, and might just work for you.  Wiring is easier when you realise that the "line" plug and the "modem" socked is electrically the same and the filter works in either direction, so you can plug on device into the "modem" socket and the other device into the "phone" socket and leave the "line" plug unconnected.  Please try it and let us know if it works for you.

You can never have enough Volvos!

Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.