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The device converts bipolar digital signals coming ultimately from a digital circuit and directly from a Channel service unit (CSU), into a format (e.g. RS- 530) compatible with the piece of data terminal equipment (DTE) (e.g. a router) to which the data is sent. The DSU also performs a similar process in reverse for data heading from the DTE ...
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In telecommunications, a channel service unit (CSU) is a line bridging device for use with T-carrier, which is used to perform loopback testing; may perform bit stuffing; may also provide a framing and formatting pattern compatible with the network; provides a barrier for electrical interference from either side of the unit; and
The purpose of CPRI is to allow replacement of a copper or coax cable connection between a radio transceiver (used example for mobile-telephone communication and typically located in a tower) and a base station/baseband unit [3] (typically located at the ground nearby), so the connection can be made to a remote and more convenient location. [4]
The two phrases, "customer-premises equipment" and "customer-provided equipment", reflect the history of this equipment.Under the Bell System monopoly in the United States (post Communications Act of 1934), the Bell System owned the telephones, and one could not attach privately owned or supplied devices to the network, or to the station apparatus.
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)
A typical system consisted of a basic metal mounting frame, the Key Service Unit (KSU), also called a panel, with card-edge connectors and mounting brackets for components and punch-down blocks for interconnecting cabling. The principal switching and control modules were constructed on printed circuit boards, called Key Telephone Units (KTU).
When a user picks up their phone, the concentrator produces the dial tone.When the user dials, it reads the tones. Once the user has completed dialing, the concentrator's microcomputer sends the dialing data to the central switch, which allocates a time slot for the dialing phone on the wire pairs that pass through the concentrator and through the switch.