This list of telephone switches is a compilation of telephone switches used in the public EFive E10B adapted for the North American environment as a class- 5 switch. FW1; GTD-3 EAX (Toll switch, NOT CCS7 capable); GTD-5 EAX ( Class 5 switch, many in use today, was the primary switch in former GTE exchanges. can ne1 help in making a report on E10B switch,which includes all the of OCB switches and other releated switches in telephone exchange. E stands for ELECTRONIC 10 for DIGITAL B for VERSION B. SO, IT IS THE 1ST ELECTRONIC DIGITAL EXCHANGE MADE BY FRANCE IN

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Other designs use time-switching only, throughout the switch. Another handshake, to start timing for billing purposes, caused a second set of clunks when the called party answered. A component of the MDF is protection: Multiple fibre connections can be used to provide redundancy to voice and data connections between switching centres, but careful network design is required to avoid situations where a main fibre and its backup both go through the same damaged central office as a potential common mode failure.

The exchange provides dial tone at that time to indicate to the user that the exchange is ready to receive dialed digits. Telephone switches are usually owned and operated by a telephone service provider or carrier and located in their premises, but sometimes individual businesses or private commercial buildings will house their own switch, called a PBX, or Private branch exchange. Crossbar architecture was more flexible than step offices. Reed relay technology in stored program control exchange finally quieted the environment.

Archived from the original on What is an electronic exchange? I think the 20th, but don’t quote me on. Please help improve this article by adding citations to reliable sources. Archived from the original on 1 August The control logic has to allocate these connections, and most switches do so in a way that is fault tolerant. In modern networks, this is usually controlled using the Signalling System 7 SS7 protocol, or one of its variants.

List of telephone switches

These voltage exvhange on the trunk circuit would cause pops or clicks that were audible to the subscriber as the electrical handshaking stepped e0b its protocol. In manual service, the operator knows where a call is originating by the light on the switchboard jack field.


The system never achieved the reputation of the CX product due exchage problems with poor contact pressure in the interconnection relays. The design and maintenance procedures of all systems involved methods to avoid that subscribers experienced undue changes in the quality of the service or that they noticed failures.

Fifty trunks would require a hundred pair cable between switches, for example. Robbed bits were translated to changes in contact states opens and closures by electronics in the channel bank hardware. From Wikipedia, the free encyclopedia.

Equipment testing, phone numbers reassignments, circuit lockouts and similar tasks were accomplished by data entry on a terminal. For example, a digit receiver part of an element called an Exchagne Register would be connected to a call just long enough to collect the subscriber’s dialed digits.

Examples of signals communicating supervision or call progress include E and M signalingSF signaling, and robbed-bit signaling.

Telephone exchange – Wikipedia

Step-by-step call Subscribers hear a different-sounding dialtone in a step-by-step call. Central exhange locations may also be identified in North America as wire centersdesignating a facility from which a telephone obtains dial tone.

This was done with relay logic and discrete electronics. While many subscribers were served with party-lines in the middle of the 20th century, it was the goal that each subscriber telephone station were connected to an individual pair of wires from the switching system.

In one case, seven digit numbers were preceded by a digit 1 or 2 to differentiate between two area codes or office codes, a two-digit-per-call savings.

In order to connect two voice channels say A1 and B2 together, the telephone switch interchanges the information between A1 and B2. Exchanges based on the Strowger switch were eventually challenged by other exchange types and later by crossbar technology.


Despite its much lower cost of production and installation, the level of maintenance required to keep these systems on good order doomed this variation of the CX design. As a result, if a connection is faulty or noisy and the customer hangs up and redials, they will get a different set of connections and subswitches.

There is continued high-demand for Alcatel E10 parts for networks which still use the technologies to this day. Telephone switches are a small component of a large network. As the capacity of individual switches and the optical fibre which interconnects them increases, potential disruption caused by destruction of one local office will only be magnified.


In rural areas some smaller switching facilities, such as community dial offices CDOswere housed in prefabricated metal buildings. The conversion of the analog signals which represent speech to the pulse code modulated PCM digital form takes place in the local switch units, each e0b which serve around subscribers. Views Read Edit View history. Similar schemes were used in the Americas and in some European countries including Spain.

Telephone exchange

This is the method usually used in central office switches, which have low utilization of their resources. A telephone exchange is a telephone system located at service centers central offices responsible for a small geographic area that provided the switching or interconnection of two or more individual subscriber lines for calls made between them, rather than requiring direct lines between subscriber stations.

Telesis Santral Teknik Servisi. A make-busy identified the part being worked on as in-use, causing the switching logic to route around it. Archived from the original on 10 April At the other end of the line, the digital signals are turned back into analog wave form by remote switches and then transmitted on to the receiving subscriber. An early form called Panel Call Indicator Pulsing used quaternary pulses to set up calls between a panel switch and a manual switchboard.

Digital switches encode the speech going on, in 8, time slices per second. This monitoring of connection status is called supervision. The subscriber could receive calls but could not dial out.

The first commercial roll-out of a fully digital local switching system was Alcatel ‘s E10 system which began serving customers in Brittany in Northwestern France in Archived from the original PDF on Their purpose was to eliminate the need for human switchboard operators who completed the connections required for a telephone call.

The second, all your doctors have immediate access to what you’ve been … doing health care wise throughout the network. The McBerty design used an early ” wire spring relay ” and welded piano wire interconnections rather than complex wire multiples.