What is ISDN? ISDN is a digital phone line that has 2 - 64 kbps channels. This technology has been around since the late 1980s. A studio needs certain equipment that can transmit/receive an ISDN connection. Some equipment uses a single ISDN line, like the Telos Zephyr, or Musicam Prima. Other equipment boxes, like the APT Milano, use multiple ISDN lines to achieve a higher bitrate.
What are the advantages? Firstly, constant bandwidth, no drop outs, no need for internet, and low delay.
Disadvantages? Becoming harder to support because telephone providers want to shut services down. Over the last 5 years many communities have lost the ability to install an ISDN line.
Source Connect, ipDTL
There are multiple internet based high quality audio solutions. The advantages that they can be used anywhere there is a high quality internet connection. The disadvantages include dropouts if bandwidth is interrupted anywhere across the internet. There are some excellent sounding solutions such as Source Connect and ipDTL for studio quality audio. With proper implementation these can outperform ISDN quality audio.
Ultimately sound quality has more to do with the room, microphones and preamps then connection type. Our booths are quiet, comfortable and large enough to have up to 3 talent at once. We also have an excellent selection of high end professional microphones for you to choose from and can do patches with time code for video lock. If you have any questions about digital patch compatibility, give us a call.