Dave Courvoisier's Blog

Dave Immer of Digifon, is one of a handful of North Americans who knows ISDN up and down, North and South, in and out…and still keeps his sanity.

He's held my hand through many a frustrating moment in the installation of ISDN in my studio, and always seems to have the right answer with a calm demeanor.

I asked him if he'd be willing to offer his advice on some of the most common questions concerning ISDN — a sort of ISDN FAQ if you will — and he graciously agreed.  Click below to see the Q & A….it's worth it, whether you have considered, are considering, or might consider acquiring ISDN technology in your studiio.

Dave:  thanks again… your answers are spot-on!

BTW, you can reach Dave seemingly anytime at: 203-254-0869.  He DOES have a minimal time-based charge for support.

1. Why is ISDN so obscure in North America, and widely accepted in Europe? 

A: Europe, especially Germany, was first out of the gate with ISDN. In
Germany, ISDN is what you get when you order a telephone line. In
France, the telco actively promoted digital feature-rich telephones.
The vast US telephone network really didn't present a good business
model opportunity due to line-quality limitations. Also, broadband IP
came along and blew ISDN out of the water with regard to average data
speed. While ISDN is perfectly suited to live-audio applications, other
non time-sensitive forms of data-delivery benefit more from the much
faster, albeit bursty, speeds of broadband IP. 

2. Are most of the ISDN equipment manufacturers based in Europe? 

A: Taking into account all ISDN applications, probably. But the 2 most
popular audio codec brands, Musicam and Telos, are US companies. APT is
Irish and Mayah is German. 

3. What portion of your clients are individuals? Professional Studios? Other companies? 

A: Our bridge clients tend to be pro studios and production facilities
since it is typically the producer that books bridging services.
However, we have probably sold more codec systems to voiceover artists. 

4. You offer a wide array of hardware solutions on your Digifon.com
website. Do you have a favorite for reliability? Ease-of-use? Customer
support? Durability? 

A: In all those categories I would choose the Musicam line of audio codecs. 

5. What is the minimum set of specifications you recommend for someone purchasing a codec? (a box, not AudioTX) 

A: An ISDN audio codec should be compatible with MPEG layer II
(L2MONO128) since that has emerged as the street standard among
voiceover producers and artists. For other applications such as music
or ADR, a high-end APT-X system would be best. 

6. With the codecs, does spending more money equal buying a better
product (in other words, do you get what you pay for, or are you buying
a “name” in some instances?) 

A: Generally speaking, yes, more money usually gets you more functionality, better quality. 

7. In your experience, what is the greatest challenge for the
individual voice-actor in acquiring and installing ISDN in a
home/private studio? 

A: Finding/creating the space in which to work and dealing with the
acoustics is the greatest challenge. Setting up and learning how to use
the equipment is relatively easy. 

8. Why are North American telephone companies seemingly difficult to
work with for the uninitiated individual who is trying to install and
configure ISDN? 

A: Live broadcast audio is one of the few applications for which ISDN
is perfectly suited. As a result it doesn't generate much profit for
the telcos and so they don't allocate many resources to personnel and
training. Which, in turn, makes it difficult to identify and locate
helpful, knowledgeable individuals at the telcos because there are so
few. 

9. Which telephone company carrier do you perceive has the best plan
for installing ISDN? For customer service with ISDN? For long distance
ISDN service? For long distance ISDN costs? 

A: It depends on the which area has the biggest concentration of users,
these being California, New York and Illinois. Providers in those
states generally offer the best pricing for the local loop. For long
distance either Sprint or MCI provide the most reliable and inexpensive
service. 

10. Should an ISDN subscriber expect to pay a monthly or per-call fee for outgoing ISDN calls? 

A: Expect to pay both a monthly access fee and per-minute outgoing charges, just like a standard land line. 

11. Are there geographic (i.e. urban vs. rural) differences in
installation and monthly ISDN service fees? If so, why? 

A: Each telco has filed tariffs with the state(s) outlining service
plans and charges. It varies widely from area to area and will often be
more expensive in rural locations than urban. ISDN has a circuit
distance limitation of about 3 miles, beyond which "repeaters" are
required. This adds expense to the deployment and gets passed on the
the customer. 

12. Is AudioTX a viable alternative to hardware codecs? 

A: Yes. But bear in mind that it will be affected by the stability of the PC it is running on. 

13. How does AudioTX achieve par with codecs? Is something sacrificied? 

A: As long as you have a good quality sound card, your results should be similar. 

14. What’s the biggest trade-off in choosing the more affordable
AudioTX, over a popular codec like, say, the Telos Zephyr? 

A: A PC-based software codec like AudioTX is subject to instability
such as software conflicts, general PC health and system overhead
unlike a dedicated hardware codec. 

15. What specific components are needed to complete the AudioTX hardware configuration? 

A: You need the AudioTX software and license, a good sound card, an ISDN terminal adapter and an NT-1 network terminator. 

16. Do you see a day when Voice Over broadband IP solutions are as reliable as the copper-wire ISDN of today? 

A: That day is here providing you use the latest hardware models from
Musicam – the Suprima and RoadWarrior. These boxes enable the user to
make fine adjustments in the bit-stream behaviors to optimize the
reliability and delay resulting in ISDN-like performance.

CourVO

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