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.
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.
iMSS (Italtel Multi Service Solution), a.k.a. i-SSW
i-VLS (Italtel Virtual Lite Switch)
i-MCS (Italtel Multimedia Communications Suite) - NGN Class 4 and Class 5 SoftSwitch + IMS Core + TAS for delivery of POTS/ISDN/SIP services over legacy and IP Broadband access type networks
i-RPS (Italtel Routing Policy Server) - Centralized Routing Platform for IP Convergent Networks
ITEC
EMS-1 (The ITEC Electronic Modular Switch is an electronic direct control switching system. The modules are combined to form a complete switch or any of the modules can be added to your present Step-by-Step Systems.)
EMS-2 (The EMS-2 RURAL SWITCH is a stored program control analog switch designed to be cost-effective in small exchanges. The modular design with connectorized cabling permits fast initial installation and growth. The system requires minimum maintenance and is particularly suitable for unattended exchanges. The EMS-2 distributed control design prevents total switch failure which could isolate a remote community.)
(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
CS2000 (180,000 lines 200,000 trunks TDM and VoIP)
CS2100 (230,000 ports, 125,000 IP phones, 150,000 analog telephones, 125,000 digital telephones, 200,000 IP trunks, 50,025 digital trunks, 32,000 analog trunks, 200,000 SS7 trunks, 4,093 H.323 gateways, 112,000 nodes per host, 99,999 ACD agents)
DMS-10 Carrier Class Switching System (320 ISDN PRI links or more than 20,000 lines) (First "production" class 5 digital switch installed in the North American public telephone network[citation needed])
DMS-10 RLCM (640 line remote)
DMS-10 RSLE (520 line remote)
DMS-10 RSLM (640 line remote)
DMS-10S (super small DMS-10 for very small exchanges, less than 640 lines)
DMS-10M (prepackaged DMS-10, a Community Dial Office in a pre-packaged container/"box")
DMS-100 (large local digital Class 5) (also known as an SL-100 when used as CPE (Customer Provided Equipment or PBX service)also known as Centrex.A NortelDMS-100e used by an operator to offer local and long-distance services in France
DMS-100/200 (local/toll digital more than 135,000 lines)
DMS-200 (toll digital)
DMS-250 (Equal Access Carrier Switch-digital)
DMS-300 (International Gateway Switch-digital)
DMS-300/250 (combination Carrier/International Gateway 70,000 to 100,000 trunks)
DMS-500 (Local/Toll + CLEC Switch)
DMS-Global Services Platform
DMS-MTX (Cellular MTSO)
Stored Program (SP) (Electronic Stored Program Control using mini-bar switches)
SP1 2-Wire (Local)
The SP1 processor was constructed using Small Scale Integration (SSI) Diode Transistor (DTL) Logic. Two types of memory was used. Processor read/write scratch memory (called CALL STORE) was implemented using a magnetic core variant called Ferrite Sheet. Program and Data Store (used to store Software and infrequently changed data) was implemented using a technology called piggy back twistor - in modern parlance a write once, read many times non-volatile memory system). As was the case with the #1ESS systems, processors and memory were duplicated with automatic comparison of processing results and automatic recovery in the event that a mismatch was discovered. It did not however support the complex recovery mechanism provided in the #1ESS where a processor from one half of the complex could be connected to a mix of memory (both call store and program store) modules from both halves of the complex in order to achieve a working combination. Processor diagnostics would generally narrow a problem down to a board or three. Connection was made via a crossbar switch.
A SP1 2-wire variant was also available that provided Centrex services.
A version of the SP-1 ESS that could provide both 2 & 4 wire services was also built. The first instance was installed in Vegreville Alberta in 1976 or 1977.
SP1 4-Wire (Toll)
The first example of this switch was installed for Bell Canada, in Thunder Bay, Ontario in late 1973. It provided toll services for North Western Ontario and CAMA (Centralized Message Accounting) for the City of Thunder Bay. The City of Thunder Bay which operated its own Telephone Company installed a number of 2W SP1s.
SP1E (used NT40 processor which was later the first processor system for the DMS-100 Family of switches)
NE-1ESS (Northern Electric version of Western Electric) #1ESS {licensee} [citation needed]
Bell Canada operated NE-1ESS 2 wire switches (some of which also provided Centrex services) in Toronto, Ottawa and Montreal. A 4W NE-1ESS was installed in Thunder Bay to provide telephone switching services (SAGE and AUTOVON)for USA and Canadian bases in that part of North America. The #1ESS was implemented using discrete diode transistor logic. A typical circuit board would implement a single 4 input "NAND" gate. Of the myriad of cards in the system - many were dedicated diagnostic gates. The diagnostic software had a very high (95% +) success rate identifying a single failing card. The success rate dropped quickly thereafter. Drifting Voltage Regulator cards caused a lot of angst.
NE-4A (Northern Electric version of Western Electric) 4A toll {licensee} [citation needed])
NE-5XB (Northern Electric version of Western Electric) #5Xbar {licensee} [citation needed])
