Path: utzoo!telecom-request Date: Fri, 26 Apr 91 9:51:01 CDT From: Will Martin Newsgroups: comp.dcom.telecom Subject: Caller-ID Chip Specs Message-ID: Organization: TELECOM Digest Sender: Telecom@eecs.nwu.edu Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 310, Message 7 of 11 Lines: 49 The April '91 issue of Electronic Products magazine has a "new-product" announcment for a Caller-ID chip from Sierra Semiconductor Corp. on page 81, and an editorial on the concept on page 7. Here's the chip specs: "The SC11210/211 Caller Indentification Circuit is the first highly- integrated analog front end that supports the Caller Number Delivery feature in a general switched telephone network. It receives and decodes frequency shift key (FSK) modem signals -- sent through telephone lines between the first and second rings -- and allows the caller's number to be transmitted to a user's premises while the phone is on-hook. The device includes a differential-input buffer, a four-pole bandpass filter, an FSK demodulator, a user-selectable energy detect circuit, and a clock generator. The SC11211 version provides support for the power-down and call-progress detect functions and has four energy detect levels. The SC11210/211 operates from a +5V supply and is available in 8- and 14-pin packages. (About $2 ea in qty 10,000 -- available now.)" Contact: Sierra Semiconductor Corp. - Michael Friedman - 408-263-9300 Maybe the availability of this chip will cut the costs of Caller-ID displays and make more PC-interfacing units available, and make it easier for hobbyists to make their own versions. As a practical matter, if a telco implements Caller-ID services, is it going to send the data down the line on each and every call to each and every instrument or line, or is it going to limit the data transmission so that it only goes to people who have paid for it? Would it be cheaper to send it to everyone or to do an edit and send it only to the limited subset? [This might be like touch-tone acceptance used to be in many areas -- it was easier and cheaper (or even necessary) to turn it on for an entire CO or community, rather than enable it just for those who paid the touch-tone premium. Of course, lately we've seen that the telcos have been able to economically discriminate between lines where tone-recognition was paid for and those where it wasn't. So will caller-ID start out with that cost-effective discriminatory ability universally available initially?] Regards, Will wmartin@stl-06sima.army.mil