I've done contracting jobs for a publishing company. They had a 64k line and it cost them around R6200.
40 people trying to surf the net. And send emails (not to mention receive the email) is not just a bottleneck, its a damn near pain in the ass.
"Why is the internet so slow"
"Gee gorsh, is it because your mail server is trying to download 150meg of email while trying to send 300meg plus 39 other people trying to go to
www.datingbuzz.com THROUGH A 64K LINE!"
They got very pissed off with me after a while. So I had to come up with a proposal (note, this isnt what I do primarily) to how I can not ONLY speed everything up, but save them 50% of the expense.
Now. Please take note. In around 4 months time I was there. The diginet line went offline 7 times. Sometimes for up to 3 days. Since I got them their uncapped business adsl 512k line. The only down time which was experienced is if there were heavy storms. (Satelite array) And this was only international. Mail worked like a charm... all they had to bear with is the slow to non-existant international website access.
So. Having said that. ADSL with a static option is the way to go. If you REALLY want to have no down time (aka cloud cover ruins your international) then go get the fibre option which would set you back a bit more.
I would also recommend getting Mail Marshall, a local one, and routing any mails (incoming and outgoing) through there. It's perfect because when your server goes down, it piles up the email for later delivery, and your server isn't trying to send to international mail servers (which probably would reject your mail as spam because you need to setup reverse dns lookups etc which is a pain in the ass if your ISP is a stick in the mud)
Diginet is such an old technology that if you go to the USA and ask about it. They'll have to google it because in THEIR lifetime, they haven't experienced diginet.
The costs associated of installing a diginet line is also huge. It costs Telkom almost 10x more to install the line for you. So, you won't be suprised to know that you have to sign a 24 month contract...
Your choice. If the company you work for can't afford a 64k diginet line, they don't deserve having any kind of internet connection if they won't consider ADSL.