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Centrex is a portmanteau of central exchange, a kind of telephone exchange. It provides functions similar to a PBX, but is provisioned with equipment owned by, and located at, the telephone company premises. [1] Centrex service was first installed in the early 1960s in New York's financial district by New York Telephone.
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)
The voice switching fabric plan was similar to that of the earlier 5XB switch in being bidirectional and in using the call-back principle. [clarification needed] [citation needed] The largest full-access matrix switches (the 12A line grids had partial access) in the system, however, were 8x8 rather than 10x10 or 20x16.
5ESS uses a time-space-time (TST) topology in which the Time-Slot-Interchangers (TSI) in the Switching Modules assign each phone call to a time slot for routing through the CM. CMs perform time-divided switching and are provided in pairs; each module (cabinet) belonging to Office Network and Timing Complex (ONTC) 0 or 1, roughly corresponding ...
Electronic shared-control systems led quickly to the modern hybrid telephone system, as the features of PBXs and key systems quickly merged. One of the most recognized such systems is the AT&T Merlin. Additionally, these more modern systems allowed a diverse set of features including: Answering machine functions; Automatic call accounting ...
AT&T (NYS: T) Mobility launched five new smartphones using Google's (NAS: GOOG) Android platform, including the Motorola Mobility (NYS: MMI) Atrix 2, a sequel to the Motorola Matrix that AT&T ...
Multiline hunting (sometimes MLH, line hunting or MHG, multiline hunting group) is a feature that allows multiple telephone lines going into a business to act as a single group, called a hunt group. This type of fallback is a somewhat more complex form of call forwarding. If the line called is busy, the call goes to the next available line.
AT&T Long Distance was the primary customer for the switch. Driving development from the customer's perspective was AT&T VP Billy Oliver. [4] Previous tandem switching systems, primarily the No. 4 Crossbar switch, used analog voice signaling. The decision to switch in a digital voice format was controversial at the time, both from a technical ...