Search results “Telephone exchange switches”
AT&T Archives: The Step-By-Step Switch
See more from the AT&T Archives at http://techchannel.att.com/archives The purpose of this film was to show employees, back in 1951, how calls were automatically switched through an SxS office. This film gives a general appreciation of the importance, complexity, and cost of switching equipment in an average 1950s telephone office. The path of a call is illustrated as it runs through a demonstration unit. "Careful adherance to Bell System maintenance practices" is stressed. While this is only part I, Part II eventually showed the equipment in various types of use, and Part II showed the internal circuit operations. Switchers today are digital and look drastically different. These systems at this time were still not even transistorized, so this film shows a system that's not only years back in time, but many generations back in terms of technology. Producer: Audio Productions, Inc. Footage courtesy of AT&T Archives and History Center, Warren, NJ
Views: 226181 AT&T Tech Channel
T 4.3  Telephone exchanges -- Manual, Strowger, Cross Bar and Stored Program SPC
A complete video lecture course with anaimations on telecom technology
Dialing Through The Step-by-Step Telephone Switching System
NOTE: ALL MY REPLIES TO COMMENTS PRIOR TO AUG 24, 2017 HAVE BEEN LOST DUE TO A PROBLEM WITH MY GOOGLE ACCOUNT. I WILL CONTINUE TO ANSWER NEW QUESTIONS GOING FORWARD. Watch a rotary dial telephone call progress through the SXS switching system to telephone number Beechwood 4-5789. You can see a complete SXS Central Office in operation at this link https://www.youtube.com/watch?v=_VO7MWFI9SU
Views: 7526 Hicken65
Telephone Switching||Time Division Switching||Space Division Switching||Switching
It gives classification of Switching in Telephone Systems. #ekteacher #telephoneswitching #switching #spacedivisionswitching #timedivisionswitching #combinedspaceandtimedivisionswitching #typesofswitching
Views: 3923 ek teacher
Automatic telephone exchange - operating
A step-by-step automatic telephone exchange brought into operation in 1921 at a post office in Ljubljana, which was the first automatic exchange in the then Kingdom of Serbs, Croats and Slovenes (later Yugoslavia). Originally it connected 500 users, but the facilities were later upgraded. Before being donated to the Museum of Post & Telecommunications in 1981, it had a total of 2000 subscribers. Two automatic telephones are connected to the exchange; the first is a Siemens & Halske and the other Telefongyar R. T. Budapest.
Views: 29598 Sounds of Changes
Inside a Siemens (GPT) ISDX Telephone Switch
These are all over the place but it's not often you'll see one, let alone four! Time to take a look inside three ISDX 300s, plus their bigger brother, the ISDX 3000. Info on the ISDX 300, a.k.a. ISDX-S: http://hipath.custhelp.com/DX_files/HiPath_DX_EP_V9new/EP%20v9.0/description/isdx_s/main_equipment.htm Info on the ISDX 3000, a.k.a. ISDX-L or ISDX-T: http://hipath.custhelp.com/DX_files/HiPath_DX_EP_V9new/EP%20v9.0/description/isdx_lt/main_equipment.htm INDEX 0:09 Introduction 1:03 Under the hood of a running ISDX 300 2:56 Decommissioned ISDX 300s - TWO of them 4:01 Inside the old one (rev. 5.x) 4:16 RISC loader 5:09 RISC CPU 5:49 4 Channel Serial I/O 6:16 Delta Channel Controller 6:33 Digital Switch Controller 6:58 300 Baud Modem 7:28 Shelf Interface 7:45 16 Channel GP I/O 8:19 Rotary Register 8:53 Universal Trunk Controller 9:39 4 Channel Interface 1 (SPM) 10:32 2M Word Memory and Control 11:03 CPU 1 11:30 CPU 2 12:37 16 Channel Codec 12:59 16 Channel Extension 13:47 Communications Equipment 14:20 8 Channel Bypass 15:20 Ops Console Interface 16:39 Inside the new one (rev. 9) 17:00 System Card 17:51 Backplanes 19:16 30 Channel Digital Line Card 19:37 GPIO and Modem 20:22 Backplanes again 21:56 Bigger brother: the ISDX 3000
Views: 13181 AintBigAintClever
Exclusive: Inside Verizon's 3G and 4G Network | Pocketnow
On the heels of the one-year anniversary of its 4G LTE service rollout, Verizon Wireless has granted Pocketnow exclusive access to one of their switches in southeastern Pennsylvania. The switch (or Mobile Telephone Switching Office -- MTSO) is a hub of Verizon's network in the Philadelphia tri-state area: it's what connects the towers in the region and processes all voice and data calls. The switch, which is a building filled with miles of fiber optic cable, a battery backup system and a generator system, dozens of servers, and a control room that monitors precise data as it pertains to the performance and stability of the system, is a marvel of engineering and technology. We also get to witness Verizon's obsession with reliability of their network. Each and every component is redundant within the switch so that if there are any equipment failures or even a natural disaster that disrupts power to the entire facility, Verizon customers are likely to still have service. We also learn a lot about the difference between Verizon's 3G and 4G network, the latter of which now reaches 200 million people in 190 markets across the U.S., including much of the Philadelphia region. During multiple Q&A session, we learn about the capabilities of Verizon's 4G LTE network, which is only going to increase with further network upgrades. Thank you to the folks at Verizon Wireless for letting us take a tour of the infrastructure that is responsible for making their network operate. If you want to learn even more about Verizon's network, check out our exclusive tour of their hardware testing lab: http://www.youtube.com/watch?v=7JHXl_rXXRY Subscribe: http://bit.ly/pocketnowsub https://pocketnow.com Follow us: http://flipboard.com/@Pocketnow http://facebook.com/pocketnow http://twitter.com/pocketnow http://google.com/+pocketnow http://instagram.com/pocketnow About us: Pocketnow has been a key source of mobile technology news and reviews since its establishment in 2000. With offices on three continents, Pocketnow offers round-the-clock coverage of the mobile technology landscape, from smartphones to tablets to wearables. We aim to be your number-one source for mobile tech news, reviews, comparisons, and commentary. If you love mobile as much as we do, be sure to subscribe! Exclusive: Inside Verizon's 3G and 4G Network | Pocketnow https://www.youtube.com/watch?v=qZSsfTnQPIE PocketNow https://www.youtube.com/pocketnow
Views: 63417 Pocketnow
Step-by-Step Telephone Switch Line Finder HD
Some various short video clips from a Western Electric Strowger telephone switch from a telephone office. I'm working on a video of my switch, and thought I'd upload a few sample clips.
Views: 80164 westernelectric
CP's Local Telephone Exchange Personal Tour. Unedi
This is Raw footage of my Trip to the Local Telephone Exchange Location in Miami, Florida. Switches, dslams, Local Exchanges, ISDN, LD, InterLATA, ect. ATT Local Switch in the 305 / 786 Area Code
Views: 17040 Carlos Pineiro
Speedy Cutover Service, SXS switching cutover to ESS filmed live at Glendale CA central office, 1984
A brief but surprisingly exciting 1984 video showing the preparation and live, real-time cutover from Step By Step switching system (SXS) to a new electronic switching system (ESS) in Glendale, California. Western Electric offered the Speedy Cutover Service to switching offices throughout the Bell System. Western Electric installers would visit a facility and prepare it, installing the new equipment inside the facility. They would identify and mark the existing cables that would need to be cut, then prepare employees for the cutover to the new ESS system. Previously a cutover from step-by-step (or from crossbar service) to ESS would take many frantic minutes, upwards of an hour, during which time active telephone service would be lost mid-call. With the speedy cutover service – 51 installers simultaneously cutting 927 cables as fast as possible, all on cue – the interrupted service could be brought down to well under a single minute. The climax here is unquestionably the moment of truth, the cutting of the cables, which is shown in real time. After making sure no emergency calls are underway, and with a shout of "Let's cut it!" the race is on, with three camera set-ups and a disco score capturing and preserving the moment of truth. Footage Courtesy of AT&T Archives and History Center, Warren, NJ
Views: 39244 AT&T Tech Channel
No  5 Crossbar Tour
Museum volunteer Ed Mattson gives a tour of the 5XB from Mercer Island's ADams exchange. This video is captioned, because the 5XB can get loud sometimes ;) Part 2 here: https://youtu.be/f_0K8EMN6iI
Views: 19209 Connections Museum
Les 'Andy' Anderson demonstrates a 7 digital call (722-5634) through Seattle's PARKWAY Panel Office (In service from 1923 - 1972). This historic Panel Office provided Seattle with its first dial tone and direct dial calling (no operator assist) in September of 1923. This video shows the call as it is set up from the Line Finder through the District and Sender frames to the Final Frame. The Sequence Switches are shown at each stage (you'll hear an overlap of sound).
Views: 19452 Connections Museum
Strowger Step-by-step Demonstration
A short training film, believed to be from Telstra showing the operation of Strowger telephone switching using a model exchange. It illustrates a uniselector, group selectors and a final selector. Note the mix of 2000 type and 4000 type groups selectors. Video courtesy of Richard Youl. A correspondent adds: "This is from the first year apprentice course at the Telecom Training School at Tooronga in Melbourne from the mid 1970's. I remember it well."
Views: 34903 Sam Hallas
AT&T Archives: Switchboards, Old and New (Bonus Edition)
See more from the AT&T Archives at http://techchannel.att.com/archives Introduction by George Kupczak of the AT&T Archives and History Center Switchboards, Old and New traces the development of voice switching methods from the first system that utilized the wires of a burglar alarm unit in Boston in 1877, to the "latest type" of switching in central offices, circa 1932. Along the way, we get the evolution of the Operator as well. Originally teenage boys were hired as operators, but it was quickly noted that they were not ideal due to being rambunctious and prone to pranks. Emma and her sister Stella Nutt were the first female operators, hired in 1878. They started a tradition that continued to the 1970s, when equal hiring practices made it possible for men to become operators as well, again. Switchboards started to be replaced by TSPS (Traffic Service Position System), starting in 1969. Voicemail trees, also called Interactive Voice Response, also replaced operators. In 2000, there were fewer than 300,000 operators working in the U.S., most at the switchboards of large companies or hotels. That number continues to drop by the thousands every year. Produced by Loucks and Norling Studios Footage courtesy of AT&T Archives and History Center, Warren, NJ
Views: 88916 AT&T Tech Channel
The Traveling Telephone Switching Machine - AT&T Archives
See more from the AT&T Archives at http://techchannel.att.com/archives The #5A Crossbar switcher, built by Western Electric at the Columbus Works, was a telephone switching machine that could handle either around 1000 lines, or up to 2000 with an extension upgrade. This made it ideal for smaller towns and communities, new large subdivisions, and larger companies. The crossbar switch itself took up 10 by 42 feet, and weighed 25 tons. The machine was pre-assembled in Ohio, and then trucked to its final installation site. This film shows the assembly and transportation, and further details about the crossbar switch's "plug and play" type of capabilities. The Columbus Works were one of the Bell System's later plants, built specifically for switching equipment manufacture, and opened in the late 1950s. It eventually manufactured not just the crossbar switch but also the 4ESS digital switch. The last major manufacturing effort AT&T ran at the plant was its Airloop, which was a wireless system announced in 1995 that was a potential replacement for crossbar-type switching systems in hard-to-reach areas. It could bring quantities of new lines to the network wirelessly, without having to build in new trunk lines to a site. At its peak, the Columbus Works employed around 12,000 workers, including 1,000 Bell Labs employees alone. In 1996 it became part of Lucent Technologies, which sold the plant in 2003. Today, the office building on the site is still occupied, but much of the manufacturing plant is empty. Writer/director: Dick Martin Music: Steve Covello Footage Courtesy of AT&T Archives and History Center, Warren, NJ
Views: 31285 AT&T Tech Channel
Automatic Electric 32A21 PAX telephone switching system.
A 1950's vintage automatic telephone system in operation.
Views: 6783 smithno41
Crossbar switching system - Telephone
From the Museum of Communications, this is a quick video of me standing in one of the aisles of the crossbar frames. I don't know which model this was, but I'll update the video when I figure it out. The system is constantly dialing via an auto-dialer one aisle over.
Views: 20835 VeeDubTDI
2012. Telephone Switch Tour
June 8, 2012. A tour of John Jones's SxS (Step by Step) switch. Film ends with a shot of Paul Will's railroad telephone board.
Working in a telephone exchange,  1960's -- Film 3792
Telephone exchange. Going for an interview as a telephone operator. Hand writing test. Training in class and use of the old style exchanges. Dummy exchange for training. London Telephone Exchange. Emergency numbers. Continental Exchange and you have to speak French.
Views: 24039 HuntleyFilmArchives
Telephone Exchange Step Switch Desk Lamp
Should be Strowger Switch instead of Stowger. Telephone exchange step switch modified as a retirement gift. I thought this was interesting and made a video of it. I remember visiting a telephone exchange when I was a kid. A building full of these switches was quite noisy. 70+ year old technology. Shooting video through the Plexiglass case was difficult.
Views: 4598 Ronald Walters
Strowger CAA-61-stara Centrala telefoniczna old exchange
Strowger PWRN Kielce-Polska
Views: 48296 MrKozjusz
GPO Telephone Exchange Rotary Cam Switch
An unusual telephone exchange (?) rotary cam switch from the 1960s or 1970s.
Views: 2402 CarlsTechShed
North Electric CX 100 All relay Telephone switch.
North Electric CX 100 TPL switch. 80 lines and 1000 numbers. 7 talking links, 6 incoming trunk links. 80 10 party lines, frequency ringing, 20,30,40,50 and 60 Hertz. All phones must have the correct ringers for the number that was assigned by the telco. The ringers are wired from Tip to ground or Ring to ground. No customer owned phones allowed. Working PSTN 218-488-2345 good 24 x 7. or C*net 448-2xxx all numbers good 24 x 7.
Views: 279 sxsphil
Electromechanical automatic telephone exchange
Dialing the last few digits before a connection is made. Recorded in Museum of Post and Telecommunications in Polhov Gradec, Slovenia.
Views: 37944 avian6
The Line Finder In The Step-By-Step Telephone Switching System
This video describes in detail the operation of the electromechanical line finder switch in the Step-By-Step telephone switching system. You can see a complete SXS Central Office in operation at this link https://www.youtube.com/watch?v=_VO7MWFI9SU
Views: 1379 Hicken65
Strowger step-by-step switch demonstration
This is a 2-digit strowger switch. It counts pulses from a rotary dial telephone (or system) and can accumulate two dialed digits. These were usually combined to allow for longer digit strings. A 7-digit string would require at least 4 of such switches (and a lot of other gear to send the ring signal, the dial tone, the busy tone, etc.) Anyone having knowledge of these (or this stuff in general) please do add your thoughts, especially if I got something wrong.
Views: 18839 glasstronic
Strowger Telephone Switch in Action
Views: 2168 Watts Ueltschey
Introduction to Telephone Systems
Follow Eli on the Vlog Channel: https://www.youtube.com/user/EliComputerGuyLive Info Level: Beginner Presenter: Eli the Computer Guy Date Created: August 2, 2010 Length of Class: 54 Minutes Tracks Telephone Systems Prerequisites None Purpose of Class This class introduces students to the basic components of telephone systems. Topics Covered Public Switched Telephone Network Central Offices Trunk Lines PBX and Voicemail Systems PBX Stations Voicemail Subcribers Class Notes Introduction Telephone systems are not complicated if you understand how they work. A Word on VoIP VoIP is not a telephone system PSTN PSTN -- Public Switched Telephone Network is like the Internet, but for telephone communication NADP -- North American Dialing Plan -- Is the system for routing telephone calls. Central Office -- All telephone lines connect to a local central office Trunk Lines Every Trunk Line has a telephone number A Trunk Line allows for 1 incoming or outgoing call. You can have far more telephones in a building then you have trunk lines. Incoming Trunk lines are setup in Hunt Groups. If the main phone number is busy the call is automatically forwarded to the next number in the Hunt Group Incoming Hunt Groups are setup by your local telephone company. Outgoing calls can be routed to use selected trunk lines. This in configured in your PBX. PBX and Voicemail The PBX routes telephone calls The Voicemail system provides all audio messaging. (Voicemail boxes, Message Boards, and Auto Attendant Messages) Stations All devices that connect to the PBX are "Stations". This includes telephones, call boxes, intercom systems, etc. There are 2 types of stations; Analogue and Digital. Analogue and Digital stations have to be connected to appropriate ports on the PBX. An analogue phone cannot connect to a digital port and vice versa. Almost all fax machines and phones you buy at retail stores are analogue. If your new fax machine does not work it may be because it's plugged into a digital line. Subscribers Subscribers are users of the Voicemail system. Subscribers do not have to have stations Voicemail ports are the number of connections to the Voicemail system at any one time. This includes not just people retrieving their voicemail, but also incoming calls that connect to Auto Attendant messages. Final Thoughts Be careful before you touch! Most older telephone and voicemail systems were administered using a phone keypad, NOT and computer interface. If you mess something up it can be very difficult to rebuild a deleted Auto Attendant or such. Resources North American Numbering Plan PSTN -- Wikipedia
Views: 663877 Eli the Computer Guy
Lecture -18 Switching Techniques Circuit Switching
Lecture Series on Data Communication by Prof.A. Pal, Department of Computer Science Engineering,IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 98082 nptelhrd
What is TELEPHONE SWITCHBOARD? What does TELEPHONE SWITCHBOARD mean? TELEPHONE SWITCHBOARD meaning - TELEPHONE SWITCHBOARD definition - TELEPHONE SWITCHBOARD explanation. SUBSCRIBE to our Google Earth flights channel - https://www.youtube.com/channel/UC6UuCPh7GrXznZi0Hz2YQnQ Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. A telephone switchboard is a telecommunications system used in the public switched telephone network or in enterprises to interconnect circuits of telephones to establish telephone calls between the subscribers or users, or between other exchanges. The switchboard was an essential component of a manual telephone exchange, and was operated by switchboard operators who used electrical cords or switches to establish the connections. The electromechanical automatic telephone exchange, invented by Almon Strowger in 1888, gradually replaced manual switchboards in central telephone exchanges around the world. In 1919, the Bell System in Canada also adopted automatic switching as its future technology, after years of reliance on manual systems. Nevertheless, many manual branch exchanges remained operational into the second half of the 20th century in many enterprises. Later electronic devices and computer technology gave the operator access to an abundance of features. A private branch exchange (PBX) in a business usually has an attendant console for the operator, or an auto-attendant, which bypasses the operator entirely. The switchboard is usually designed to accommodate the operator, who sits facing it. It has a high back panel, which consists of rows of female jacks, each jack designated and wired as a local extension of the switchboard (which serves an individual subscriber) or as an incoming or outgoing trunk line. The jack is also associated with a lamp. On the table or desk area in front of the operator are columns of keys, lamps and cords. Each column consists of a front key and a rear key, a front lamp and a rear lamp, followed by a front cord and a rear cord, making up together a cord circuit. The front key is the "talk" key allowing the operator to speak with that particular cord pair. The rear key on older "manual" boards and PBXs is used to ring a telephone physically. On newer boards, the back key is used to collect (retrieve) money from coin telephones. Each of the keys has three positions: back, normal and forward. When a key is in the normal position an electrical talk path connects the front and rear cords. A key in the forward position (front key) connects the operator to the cord pair, and a key in the back position sends a ring signal out on the cord (on older manual exchanges). Each cord has a three-wire TRS phone connector: tip and ring for testing, ringing and voice; and a sleeve wire for busy signals. When a call is received, a jack lamp lights on the back panel and the operator responds by placing the rear cord into the corresponding jack and throwing the front key forward. The operator then converses with the caller, who informs the operator to whom he or she would like to speak. If it is another extension, the operator places the front cord in the associated jack and pulls the front key backwards to ring the called party. After connecting, the operator leaves both cords "up" with the keys in the normal position so the parties can converse. The supervision lamps light to alert the operator when the parties finish their conversation and go on-hook. Either party could "flash" the operator's supervision lamps by depressing their switch hook for a second and releasing it, in case they needed assistance with a problem. When the operator pulls down a cord, a pulley weight behind the switchboard pulls it down to prevent it from tangling. On a trunk, on-hook and off-hook signals must pass in both directions. In a one-way trunk, the originating or A board sends a short for off-hook, and an open for on-hook, while the terminating or B board sends normal polarity or reverse polarity. This "reverse battery" signaling was carried over to later automatic exchanges.
Views: 248 The Audiopedia
Crossbar Switch
This is a video of a Bell System Number 5 Crossbar Switching System registering and connecting calls dialed from rotary phones. This machine was made in the 1960s and was at the time the peak of electromechanical telephone switching technology, able to route calls in and out of its office, allowing for direct long distance dialing, and able to select the first available idle trunk to the next central office based on the area code it was given. None of these are left on the public telephone network, having all been replaced with digital switches. This one is on display in a museum.
Views: 3314 Novar Lynx
Manual telephone exchange
Manual desktop telephone exchange with wooden casing, a dial and a Bakelite handset. Manual exchanges were in use from the second half of the 19th century. In Slovenia, the last manual telephone exchange with eight connections ceased operating in September 1987. Two magneto telephones are connected to the exchange. The exchange is part of the collection of Museum of Post & Telecommunications.
Views: 5034 Sounds of Changes
Gil Smiths Basement CO, PBX, Step by Step Switch Telephone Setup 4/17/2014
Here is a tour of Gil Smiths setup. Had a good time seeing it all in action again. I did my best to fit it all in a video under 30 mins.
Views: 9964 chris537a
strowger telephone switches
These "step by step" switches were used in many telephone exchanges around the world before the advent of digital technology. This is just a small demonstration unit, but a typical central office would've contained several large racks filled with switches.
Views: 24066 Jamie P
Strowger "Step by Step" Telephone Switch: Close Up
Medium Close up of Strowger Telephone Switch Pt. 1
Views: 320 Something Phoney
Strowger Switch
Bringing an old GPO telephone exchange Strowger Switch to life..
Views: 682 mimesia
Western Electric #3 Crossbar switch.
This is a 800 line class 5 end office. Not powered up 24 x 7 yet. Their were only 28 of these made. Hope to record in HD, Also fix my narration issues. Please leave feed back if this was useful.
Views: 929 sxsphil
The Selector In The Step-By-Step Telephone Switching System Part 1
NOTE: ALL MY REPLIES TO COMMENTS PRIOR TO AUG 24, 2017 HAVE BEEN LOST DUE TO A PROBLEM WITH MY GOOGLE ACCOUNT. I WILL CONTINUE TO ANSWER NEW QUESTIONS GOING FORWARD. This video describes in detail the operation of the electromechanical selector switch in the Step-By-Step telephone switching system. Only the single digit processing functions are covered. Digit absorbing functions are covered in the Part 2 video. You can see a complete SXS Central Office in operation at this link https://www.youtube.com/watch?v=_VO7MWFI9SU
Views: 2037 Hicken65
The Life of a Telephone Operator in 1969 (with special introduction) - AT&T Archives
See more from the AT&T Archives at http://techchannel.att.com/archives Bonus Edition Introduction by George Kupczak of the AT&T Archives and History Center. A non-linear documentary about operators - male and female, but mostly female - at their work, and describing their work and the type of customers they encounter. A fascinating inside look at the skills needed by operators in dealing with the public. Shot in the style of a Maysles- or Weisman-type documentary. There are clips from a 1913 D.W. Griffith silent film, Telephone Girl and the Lady, at the beginning and end. "The operator's job, despite tensions and aggravations, is one which consists primarily of human contact and as such, carries rich rewards." Cox went on to direct television in Hollywood and also documentaries for PBS. She now lives in Kentucky and still makes documentaries. Cox also made "All in a Day's Work" for AT&T. Directed by Nell Cox Song "Operator" by the New York Rock & Roll Ensemble was originally released as a 45rpm record. Footage courtesy of AT&T Archives and History Center, Warren, NJ
Views: 146827 AT&T Tech Channel
Strowger "Step by Step" Telephone Switch PART 3: Extreme Close up
Please comment, like, & subscribe!
Views: 196 Something Phoney
See a old Telephone Switches during a phonecall
Old Telephone Switch in action
Views: 756 Ches Misso
Telephone Switchboard
Wiki: A telephone switchboard is a telecommunications system used in the public switched telephone network or in enterprises to interconnect circuits of telephones to establish telephone calls between the subscribers or users, or between other exchanges. The switchboard was an essential component of a manual telephone exchange, and was operated by one or more persons, called operators who either used electrical cords or switches to establish the connections. The electromechanical automatic telephone exchange, invented by Almon Strowger in 1888, gradually replaced manual switchboards in central telephone exchanges starting in 1919 when the Bell System adopted automatic switching, but many manual branch exchanges remained operational during the last half of the 20th century in offices, hotels, or other enterprises. Later electronic devices and computer technology gave the operator access to an abundance of features. In modern businesses, a private branch exchange (PBX) often has an attendant console for the operator, or an auto-attendant, which bypasses the operator entirely.
Views: 938 El B
Ericsson: Switches in time
A movie about telephone switches and the Ericsson AXE system. From 1985. The movie is collected from the movie archive of Ericsson at Centre for Business History, Stockholm, Sweden. Please visit http://ericssonhistory.com and http://www.naringslivshistoria.se for more information. MotivID: LM002095
Views: 4279 ericssonhistory
What is PRIVATE BRANCH EXCHANGE? What does PRIVATE BRANCH EXCHANGE mean? PRIVATE BRANCH EXCHANGE meaning - PRIVATE BRANCH EXCHANGE definition - PRIVATE BRANCH EXCHANGE explanation. Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. SUBSCRIBE to our Google Earth flights channel - https://www.youtube.com/channel/UC6UuCPh7GrXznZi0Hz2YQnQ A private branch exchange (PBX) is a telephone exchange or switching system that serves a private organization and performs concentration of central office lines or trunks and provides intercommunication between a large number of telephone stations in the organization. The central office lines provide connections to the public switched telephone network and the concentration aspect of a PBX permits the shared use of these lines between all stations in the organization. The intercommunication aspect allows two or more stations to directly connect while not using the public switched telephone network. Each PBX-connected station, such as a telephone set, a fax machine, or a computer modem, is often referred to as an extension and has a designated extension telephone number that may or may not be mapped automatically to the numbering plan of the central office and the telephone number block allocated to the PBX. Initially, PBX systems offered the primary advantage of cost savings for internal phone calls: handling the circuit switching locally reduced charges for telephone service via central-office lines. As PBX systems gained popularity, they began to feature services not available in the public network, such as hunt groups, call forwarding, and extension dialing. From the 1960s a simulated PBX known as Centrex provided similar features from the central telephone exchange. A PBX differs from a key telephone system (KTS) in that users of a key system manually select their own outgoing lines on special telephone sets that control buttons for this purpose, while PBXs select the outgoing line automatically, or formerly, by an operator. The telephone sets connected to a PBX do not normally have special keys for central-office line control, but it is not uncommon for key systems to be connected to a PBX to extend its services. A PBX, in contrast to a key system, employs an organizational numbering plan for its stations. In addition, a dial plan determines whether additional digit sequences must be prefixed when dialing to obtain access to a central-office trunk. Modern number-analysis systems permit users to dial internal and external telephone numbers without special codes to distinguish the intended destination. The term PBX originated when switchboard operators managed company switchboards manually using cord circuits. As automated electromechanical switches and later electronic switching systems gradually replaced the manual systems, the terms private automatic branch exchange (PABX) and private manual branch exchange (PMBX) differentiated them. Solid-state digital systems were sometimes referred to as electronic private automatic branch exchanges (EPABX). As of 2016, the term PBX is by far the most widely recognized. The abbreviation now applies to all types of complex, in-house telephony switching systems. Two significant developments during the 1990s led to new types of PBX systems. One was the massive growth of data networks and increased public understanding of packet switching. Companies needed packet-switched networks for data, so using them for telephone calls proved tempting, and the availability of the Internet as a global delivery system made packet-switched communications even more attractive. These factors led to the development of the voice over IP PBX, or IP-PBX. The other trend involved the idea of focusing on core competence. PBX services had always been hard to arrange for smaller companies, and many companies realized that handling their own telephony was not their core competence. These considerations gave rise to the concept of the hosted PBX. In wireline telephony, the original hosted PBX was the Centrex service provided by telcos since the 1960s; later competitive offerings evolved into the modern competitive local exchange carrier. In voice over IP, hosted solutions are easier to implement as the PBX may be located at and managed by any telephone service provider, connecting to the individual extensions via the Internet. The upstream provider no longer needs to run direct, local leased lines to the served premises....
Views: 2736 The Audiopedia