From nargun.cc.uq.oz.au!bunyip.cc.uq.oz.au!munnari.OZ.AU!spool.mu.edu!newspump.sol.net!www.nntp.primenet.com!nntp.primenet.com!netcom.com!ricardo Mon Nov 18 10:01:19 1996 Article: 31256 of comp.dsp Newsgroups: comp.dsp Path: nargun.cc.uq.oz.au!bunyip.cc.uq.oz.au!munnari.OZ.AU!spool.mu.edu!newspump.sol.net!www.nntp.primenet.com!nntp.primenet.com!netcom.com!ricardo From: ricardo@netcom.com (Ricardo Cedar Springs Dallas TX) Subject: Small Telephone Switch System Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) X-Newsreader: TIN [version 1.2 PL1] Date: Thu, 14 Nov 1996 05:39:17 GMT Lines: 145 Sender: ricardo@netcom15.netcom.com Xref: nargun.cc.uq.oz.au comp.dsp:31256 Many people emailed me about by last posting asking for technical information on the SX38 product. Here is an intermediate technical blurp. Be sure to look at the suggested applications at the end of the document. Thanks. Begin SX38 Blurp: The sx38 product is a complete small modularly expandable open architecture private branch exchange on a 12' by 12' circuit board and is delivered partially assembled with a PC compatible 120W power supply. The sx38 switch can provide complete standalone service in remote applications. Complete schematics and source code (8051 written in C, compatible with popular compilers) are provided to facilitate development of industry standard peripherals, interfaces, software and companion switching modules. The basic printed circuit board has 8 subscriber line interfaces and 3 central office line interfaces. 2 of the slics and 1 of the co interfaces are delivered pre-assembled, working and tested. 12 speech paths are provided to support non-blocked operation and support multiple conference calls in progress at the same time. All of the ports have the same terminating impedance when measured from the switch matrix allowing any port to be connected to any other port. One board provides a complete system, all the necessary common control and signaling components to set up multiple conversations at one time are included. Basic and flexible, the software is modular by nature allowing complete software control to create sophisticated communications products. The evaluation kit is $260 and is provided with a power supply which is UL registered. Two of the eight slics and one of the three co interfaces are already assembled. When you receive the board you will be able to lift either extension phone and receive dial tone, be able to make intercom calls which ring standard phones, make calls external to the system by dialing 9, receive calls from the outside and transfer the calls to another extension and answer any ringing phone by dialing 9. The evaluation kit works when you receive it. You can also expand the evaluation kit by adding easy to purchase components and simply soldering them to the board following the pattern of the already assembled circuits. Feature Overview: 8 station 3 trunk, expandable to 16 station 6 trunk. (expansion board is $120 partially assembled). 2 DTMF Senders (one provided in EVKIT) 2 DTMF Receivers (one provided in EVKIT) 2 imprecise call progress receivers (one provided in EVKIT) 2 dial tone generators 90vac 20hz Bell Ringing Invertor SLIC Supervision Generator (forces answering machines to hang up) SLIC Ring trip detect (detects offhook during application of ringing signal) All ports can add gain to the call. SLIC can transmit audio during on-hook. (Slic can send audio, like caller id, to extensions) CO can receive audio on-hook (caller id can be decoded by a central, shared, CID decoder) 2 expansion connectors with CPU bus and audio channels. Full Duplex Serial Port (300,1200,9600 bps 8-N-1) Conference Matrix for conference calls. (Any time three ports need to be on the same call.) 8051 CPU, 64KROM, 8KRAM Suggested Applications with provided software: +Small Telephone System for Home or Small Business. +Personalized Ringing Pattern Decoder for fax machine or modem. +Modem Pool controller. You cant barge in on a conversation in progress. +Any place one phone needs to call another. +Any place one, two or three telephone lines need to be shared in a convenient non intrusive manner. Applications you might develop by modifying the software and interfacing to the hardware: +SEAMLESS integration of internet phone software/sound blaster card to home or office phone system. Imagine picking up a standard phone and dialing a intercom call around the world over the internet phone and reaching another standard phone at the other end. Might even be able to receive calls from the switched network and go back to the switched network. +Automated and transparent (to the user) intercept and rerouting of voice calls to private networks or common carriers. (1+ to 10XXX+ as an example). Remember the schematics and source code are included which makes modification, expansion and integration easier. Specific Questions: EMAIL RICARDO @ NETCOM.COM