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MT64DSU Owner's Manual
DSU Basic Functions
A DSU (Data Service Unit) and a CSU (Channel Service Unit) are
typically connected to provide the interface between DTE (Data
Terminal Equipment) and the DDS (Digital Data Service) or other
four-wire networks. A DSU converts data to a bipolar format for
transmission over the digital line. The CSU terminates the user's
digital circuit, does the line conditioning, provides FCC Rules
compliance, and handles the CO (Central Office) loopback
commands. The MultiDSU64K contains the functions of a Data
Service Unit (DSU) and a Channel Service Unit (CSU) in a single
package.
DSU Functions
The DSU encodes data as pulses on the communications line by
converting the customer data stream to bipolar format for
transmission over the digital network.
CSU Functions
The CSU is used to terminate the digital circuit at the customer site.
It performs line conditioning functions, ensures network compliance
with FCC rules, and responds to test commands (either from the
telco central office or from the CSU).
Figure 1-2 shows the MultiDSU64K in a basic DDS network
installation.
Figure 1-2. Basic DSU/CSU Configuration
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