Networking Components and Devices CSU/DSU part_6
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INTRODUCTION (Students read prior to attending lab session)
The CSU is a device that performs protective and diagnostic functions for a telecommunications line while the DSU is used to connect a terminal to a digital line. Typically, the two devices are packaged as a single unit and are required at both ends of a T-1 or T-3 connection.
primary function of the DSU
transmission over the line provided
CSU is to protect the local carrier’s network
tracks statistics
provides loop-back testing
signal regeneration point
a multiplexer or the DTE. The CSU
CSU/DSUs will be provided.
two Cray Communications CSU/DSU together
Mode Bipolar w/ 8 Zero Substitution
Sync DSR On
Sync CTS On
CISCO High Speed Serial to V.35
56 K
64 K
or T1 speed
with four-wire connections
One option for connecting a company’s data network between two geographically distant offices is to use a serial connection. Some of the popular serial connections have T1, Frame Relay and 56 kbps / 64 kbps data rates. To establish the data network link, a high-speed connection (such as a T1 or Digital Data Service (DDS) 56/64 kbps line), is leased from your local carrier (e.g. AT&T/Sprint/MCI) and terminated into a CSU at the customer premise location. A DSU would normally be used to terminate the slower 56/64 kbps DDS line. In most cases, the digital line will terminate into a single device that has the DSU/CSU functionality, although, DSUs and CSUs can be acquired separately.