Regulations have already been drafted on the operation of public payphones, and the rules covering value added service providers, which offer services such as internet access and private data networks
The D6600 NetCom Fire Alarm Reporting System from Radionics of Salinas, California, has received UL 864 Commercial Fire Listing for communication of fire alarms over private data networks
and the Internet.
ISPs have long argued the access charges were designed for telephone lines which terminate in private data networks
, but an ISP network is a public network and so should not have charges levied on the telephones lines it uses.
At the switching center, Teligent uses ATM (asynchronous transfer mode) switches and data routers along with Nortel DM5 500 switches to hand off the traffic to other networks - the public circuit-switched voice network, the packet-switched Internet, and private data networks
For example, PTT Netherlands, Televerket (in Sweden) and the Swiss PTT formed Unisource to help develop and manage private data networks