channel service unit


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channel service unit

(communications)
(CSU) A type of interface used to connect a terminal or computer to a digital medium in the same way that a modem is used for connection to an analogue medium.

A CSU is provided by the communication carrier to customers who wish to use their own equipment to retime and regenerate the incoming signals. The customer must supply all of the transmit logic, receive logic and timing recovery in order to use the CSU, whereas a digital service unit DSU performs these functions.
References in periodicals archive ?
Lower Cost Single Platform - multiple T1 channel service units (CSUs), multiplexing, and IP QoS router functionality in a single, compact-footprint platform for lower hardware and backhaul costs.
Channel service units effectively act as a repeater, conditioning, shaping and enhancing the signal while providing testing and signal monitoring capabilities.
Options include built-in subrate data multiplexer cards and T1 ESF Channel Service Units.