data service unit


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data service unit

(communications)
(DSU or "data service unit") A device used in digital transmission for connecting a CSU (Channel Service Unit) to Data Terminal Equipment (a terminal or computer), in the same way that a modem is used for connection to an analogue medium.

A DSU provides a standard interface to a user's terminal which is compatible with modems and handles such functions as signal translation, regeneration, reformatting, and timing. The transmitting portion of the DSU processeses the customers' signal into bipolar pulses suitable for transmission over the digital facility. The receiving portion of the DSU is used both to extract timing information and to regenerate mark and space information from the received bipolar signal.
References in periodicals archive ?
The user may either provide a CSU into which a data service unit must interface or a combination CSU/DSU device.
Lab equipment and lab facilities (routers, Channel Service Unit/ Data Service Units, Asynchronous Transfer Mode switches, Private Branch Exchange, and communications security equipment) were provided by the BCBL (G) and through a contract with the General Dynamics Corporation.
The Access Bank II includes two T1 network interfaces with fully integrated CSU and Data Service Units (DSU), offering up to 3 Mbps of total throughput.
1) data service units or network channels (80 Unit)
Data service units mold the information into a D4-compatible signal.
The Infineon QuadFALC provides the optimal E1/T1/J1 interface solution for wireless base stations, Frame Relay and ATM gateways, Voice over DSL and Voice over IP gateways, Channel & Data service units, Internet access equipment, LAN/WAN routers, remote access concentrators, digital access cross-connect and digital loop carrier systems.
Three California firms have recently unveiled fractional-T1-compatible data service units.
InternetConnect is also authorized to sell Polycom's NetEngine routers, Integrated Access Devices (IADs) and data service units (DSUs).
Tiara's aggregation edge routers are also ideal for supercharging existing routers, providing a cost-effective alternative to legacy aggregation solutions such as data service units, integrated WAN cards, and inefficient front-end routers.