SI
SI
discoversearch

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor.  We ask that you disable ad blocking while on Silicon Investor in the best interests of our community.  If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.
Technology Stocks : Voice-on-the-net (VON), VoIP, Internet (IP) Telephony
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  
To: Frank A. Coluccio who wrote (773)6/17/1998 2:53:00 AM
From: Daniel G. DeBusschere  Read Replies (1) of 3178
 
Frank, some folk lore on Feature Group D-
Before the breakup of AT&T, the network was designed for AT&T only. That is, the state telephone companies that were owned by AT&T but reported to the state PUC were the only planned users of this interface between the Class 5 and Class 4 network switches. All other riff raff had to use "inferior" Feature Group B connections (if they could get them) which required additional dialing digits. When the break up occurred, the Feature Group D was referred to as the "Premium" connection and the RBOCs were ordered to make them available to the likes of MCI and Sprint. This required additional software, hardware, but I believe that MCI and Sprint got a big break on the use of Feature Group B access charges. At any rate, the billing systems for IXC access charges were built around these two connections. Everything else was considered to be user to network which connected on the other side of the Class 5 central office switch. These other connections were never programmed into the massive multi-mainframe data systems that tried to keep track of access charges. Such connections are ISDN PRI connections which are favored by ISPs.
Report TOU ViolationShare This Post
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  

HomeMailHotSubjectMarksPeopleMarksKeepersSettings
Terms Of UseContact UsCopyright/IP PolicyPrivacy PolicyAbout UsFAQAdvertise on SI
© 2026 Knight Sac Media.  Data provided by Twelve Data, Alpha Vantage, and CityFALCON News