This list of telephone switches is a compilation of telephone switches used in the public switched telephone network (PSTN) or in large enterprises.
Alcatel
This lists Alcatel switches before the merger with Lucent Technologies.
- 1000 E10 / S12 (during the 1990s the E10 and S12 systems were converted into a single product line)
- E10 versions:
- E10A (E10N3)- Original switch introduced in 1972 one of the earliest deployments of TDM switching in the world.
- E10B (E10N1)- Major revision in the 1980s which eventually saw ISDN capabilities. Common in France, Ireland, China, India and elsewhere.
- E10B3 - major revision in the 1990s. Common in France & Ireland
- OCB-283 - Another name for more modern versions of E10B and often the name used in India to distinguish it from older versions.
- E10-MT formerly Thomson MT-25 found mostly in France, and MT20 too.
- E10-Five E10B adapted for the North American environment as a class-5 switch.
- E10S satellite switching unit.
- E10-MSC mobile switching center for GSM and other protocols.
- 1000 (MM) E10 - Evolved switch for multimedia / broadband and IP network environments. Provides POTS/ISDN and next generation services.
- S12 - Formerly known as "System 12" or the ITT 1240 or acquired by Alcatel when it purchased ITT's assets in Europe. This is a very widely deployed switching system found in Italy, Germany, Belgium, Australia and many other countries around the world. There are a large number of versions of this type of switch ranging from local, to transit to international gateway to mobile switching centers. The line was converted with the E10 family of exchanges.
- OmniPCX Office
- OmniPCX Enterprise
Thomson
Automatic Electric Co.
Automatic Electric started producing electromechanical switching systems in the 19th century.
- 32A42
- 32A44
- 35E97
- 370A
- 370B
- 375A
- 375B
- 385A
- 385B
- C1-EAX
- CXP5
- CXP5A
- EAX #1
- EAX #2
- EAX #3
- ESU 3072 Line
- FW1 (Four Wire 1 Toll Switch)
- GTD-3 EAX (Toll switch, NOT CCS7 capable although CCIS capable)
- GTD-5 EAX (Class 5 switch, many in use today, was the primary switch in former GTE exchanges. Now supported by Lucent.)
- GTD-120 Digital PABX
- GTD-1000 Digital PABX
- GTD-4600 Digital PABX
- OMNI-S1 Digital PABX
- OMNI-S2 Digital PABX
- OMNI-S3 Digital PABX
- Strowger Automatic Toll Ticketing (SATT); relay and type 45 rotary switch mechanics
- Strowger Step-by-Step (Strowger patents were exclusively licensed to the Automatic Electric Company).
- TSPS (Traffic Service Position System, obsolete system for operator handled LD calls.)
- XPT No. 1
- 101 Director
- OXO
- OXE
DSC Communications Corp.
DSC merged with Alcatel-Lucent
- DEX 200
- DEX 400
- DEX 600
- DEX 600E
- DEX 600SC
GEC
GEC later became Marconi (Britain)
- SE50 (4000-type in GPO naming)
Hasler
List of the mainly electro mechanical switching systems from Hasler AG Bern, which were used in public telephone network in Switzerland for many decades. Hasler AG finally merged into Ascom in 1987.
- HS 25 (modified from the Ericsson OL-100 system with double relays and 25-point selector (Ericsson license), mainly used for small villages and towns in the counties)
- HS 31 (new developed register system, introduced in 1931, based on a new flat type relay and a 100-point two-motion selector, suitable for small and large exchanges)
- HS 52 (new developed register system, introduced in 1953, based on a new 120-point selector, which was in fact a 4 x 30-point uniselector with 2 x 4 brushes offset by 180°, no zero position)
- HS 52 A (new variant of HS 52 from 1973 with an almost full-electronic register evaluation unit called 'Umrechner', not processor based but centralized programmable by diode matrices)
- HS 52 B (Processor controlled multiregister system with identifier, but the relay and selector based coupling stage was maintained from the original HS 52 system)
- HS 68 (prototype of a semi-electronic switching system, based on adhesive reed-relays in the coupling stage. One sample system built but not pursued because of the arising PTT IFS-project)
- AXE-10 (digital switching system from Ericsson, initially built and adapted for the Swiss market by Ascom Hasler under Ericsson license)
The last HS 52 A and B exchanges were in operation until the end of 1997. The personnel-intensive electro mechanical systems were shut down prematurely then, due to the imminent opening of the telecoms market in Switzerland. The last AXE-10 local subscriber were migrated to VoIP in June 2020.
North Electric (Galion, Ohio)
(CX evolved from the "Automanual" system designed by Edward Clements: "Clement eXchange" or "Community eXchange")
- CX30 (30 line)
- CX60 (60 line)
- CX100 (100 line)
- CX200 ("broadspan" up to 200 lines)
- CX1000 (large CX expandable to 10,000 lines)
- MCX A version of the CX product line designed by F.R. McBerty after leaving Western Electric/Bell Labs and becoming President of North Electric.
The McBerty design used an early "wire spring relay" and welded piano wire interconnections rather than complex wire multiples. The system never achieved the reputation of the CX product due to problems with poor contact pressure in the interconnection relays. 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.
- DSS1 (North's first digital switch for local exchanges)
This later was renamed the ITT 1210 product upon purchase of North electric by ITT.
- DSS2
- ETS4 (Large #4A-ETS class toll switch based on Ericsson "code switch")
- NTS4E (4-wire toll switch with Xbar switches and "Omni" processors)
- NX1 (Family NX1A, B, C & D; All based on Ericsson By-Path Crossbar license)
L.M. Ericsson purchased North Electric in the early 1950s and brought this Swedish design to North where it was reworked to conform to U.S. telecommunications requirements.
- NX1D (Final production version)
- NX1E (NX-1D with OMNI Processor for line/directory, trunk and number-group translation services)
The NX-1E was not a SPC switch, rather it was a conventional path controlled switching matrix with electronic processors (computers) replacing the control, route selection and translation (directory number to line ID) functions.
- NX2 (Family Small 90–1800 line CDO Xbar)
- NX2 (Original design 1959–1960)
- NX2A (Improved cabinets ~1962)
- UN2 Electrically and mechanically the same as the NX-2A but with design modifications specified by United Telecom (United Telecom/Sprint/Embarq) when they acquired North from L.M. Ericsson in the early 1960s. The "United" version of NX-2A replaced the intercabling connection blocks with wire wrap connections so that switches could be installed or expanded without having custom cable harnesses provided by North Electric.
- Switcher Family (NX-2A pre-installed in a trailer for rapid installation or portable/emergency use)
- TSW Basic Unit with growth to ~360 lines
- TSW2 Expanded unit with growth to ~1200 lines
- TSW3 Jumbo unit with growth to system recommended maximums
- TSD (toll switch)[30]
- AN/TTC-20 568 Line Military Fixed Switch (Used by US Air Force - only one was known in existence at Sembach AB, Germany) (retired)
- AN/TTC-30 568 Line Military Tactical Mobile Switch (Used by US Army and Air Force) (retired)
- DCO 21
- DCO 80
- DCO 200
- DCO 360
- Century DCO6000
- DCO Remote Line Switch 1000 (RLS 1000)
- DCO Remote Line Switch 4000 (RLS 4000)
- RLS 450
- DCO-SE
- DTM
- ESC-1 "Crossreed" electronic exchange
- MS30
- SC#5 (#5 Crossbar licensed from Northern Electric (Canada) for US sales/distribution)
- Motorswitch - Siemens (Germany)
- XY (Stromberg version of Ericsson "flat motion" switch operated in horizontal planes)
The DCO family starts as generic DCO
- DCO
- DCO-E (Line Switch 10,000 lines)
- DCO-SE (Line Switch 10,000 lines, software enhanced, class features, centrex, etc.)
- DCO-RLS (Remote Line Switch, controlled by hosts above)
- RLS 1000 (Pedestal mount cabinet 1000 lines in a subdivision - required multiple T-1's to host)
- RLS 4000 (Same thing, but 4000 lines)
- RLS (This has the ability in a host outage to make intra-cabinet calls)
- The line switches will also talk to AT&T SLC-96 pedestals – 96 lines on a ped
- DCO-CS (Long-distance, very limited lines – 1+ trunking to long-distance all T-1 cards)
Note: DCO systems are now supported by GENBAND
