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WAN Terminology

Network Fundamentals / Ch. 4 - Fundamentals of WANs

QuestionAnswer
Synchronous The imposition of time ordering on a bit stream. A device will try to use the same speed as another device on the other end of a serial link. Each device can notice slight variations in the speed on each end and can adjust its speed accordingly.
Clock source The device to which the other devices on the link adjust their speed when using synchronous links.
CSU/DSU Channel service unit/data service unit. A device that understands the Layer 1 details of serial links installed by a telco and how to use a serial cable to communicate with networking equipment such as routers.
Telco Telephone company.
Four-wire circuit A line from the telco with four wires, composed of two twisted-pair wires. Each pair is used to send in one direction, so a four-wire circuit allows full-duplex communication.
T1 A line from the telco that allows transmission of data at 1.544 Mbps.
E1 Similar to a T1, but used in Europe. It uses a rate of 2.048 Mbps and 32 64-kbps channels.
Created by: k3ntucky
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