List of Telephone Switches - North Electric (Galion, Ohio)

North Electric (Galion, Ohio)

• CX "All-Relay Exchanges:

(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 1959-60)
  • 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)
• 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)