---------------------------------------------------------------------- Message-ID: <4956e67b-c382-4ade-8987-ca51a798caa2@googlegroups.com> Date: 5 Feb 2019 13:55:26 -0800 From: HAncock4 <withheld@invalid.telecom-digest.org> Subject: History Northern Electric ESS 1970 bitsavers posted a detailed technical manual for this. "The SP-I Electronic Switching System is a common control system which relies on a stored program control to give it the flexibility required to meet current telephone requirements and to readily adapt to the sophisticated services of the future. The common control utilizes the high speed of electronic devices to perform the basic switching functions of logic, memory, and input-output control Control is accomplished by sub-dividing the work required to process a call into small segments, and then time sharing the segments of several calls. High operating speeds enable a very small number of control circuits to service a very large number of lines and trunks. " "Perhaps the most advanced design feature to be introduced into the SP-l ESS is the use of integrated circuits. Components, occupying an area slightly larger than a pin head, are ecapsulated in metal units. Aside from the obvious advantage of minimal space requirements, integrated circuits are favoured in cost comparisons and reliability tests over discrete electronic components. Solid-state components are used wherever speed, reliability and size are important factors. They are incorporated in most control circuits and functional elements associated with the setting-up and supervision of calls. Set-up times for establishing network talking paths are in the order of a few hundred milliseconds. " http://www.bitsavers.org/communications/nothernElectric/Nothern_Electric_SP-1_Electronic_Switching_System_Feb1970.pdf ------------------------------ Message-ID: <20190205134348.GA5971@telecom.csail.mit.edu> Date: Tue, 5 Feb 2019 08:43:48 -0500 From: Bill Horne <bill@horneQRM.net> Subject: Some Verizon Wireless customers in Fayetteville unable to call 911 Some Verizon Wireless customers in Fayetteville unable to call 911 FAYETTEVILLE, N.C. - Police in Fayetteville are cautioning Verizon Wireless customers that they may not be able to call 911 Tuesday morning. Verizon Wireless is aware of the issue and is working to resolve it, according to a statement from the Fayetteville police. https://www.wral.com/some-verizon-wireless-customers-in-fayetteville-unable-to-call-911/18170434/ -- Bill Horne (Remove QRM from my email address to write to me directly) ------------------------------ Message-ID: <20190205140709.GA6009@telecom.csail.mit.edu> Date: Tue, 5 Feb 2019 09:07:09 -0500 From: Bill Horne <bill@horneQRM.net> Subject: Verizon customers unable to contact 9-1-1 Verizon customers unable to contact 9-1-1 By Hrisanthi Kroi Verizon Wireless customers are currently unable to contact 9-1-1, according to a news release by the Fayetteville Police Department. Verizon is aware of the issue and are working to resolve it. https://www.fayobserver.com/news/20190205/verizon-customers-unable-to-contact-9-1-1 -- Bill Horne (Remove QRM from my email address to write to me directly) ------------------------------ Message-ID: <20190206162349.GA1795@telecom2018.csail.mit.edu> Date: Wed, 6 Feb 2019 16:23:49 +0000 From: Bill Horne <bill@horneQRM.net> Subject: We have a new server [nfp] The Telecom Digest has transitioned to a new server, and I'd appreciate you feeding back info about any anomalies that you notice. My thanks to Garrett Wollman and his crew at the Computer Science and Artificial Intelligence Laboratory (CSAIL). Bill -- Bill Horne Moderator ------------------------------ ********************************************* End of telecom Digest Thu, 07 Feb 2019