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Synchronous Digital Hierarchy (SDH)

Table of Contents:
Definition and Overview
1. Introduction: Emergence of SDH
2. SDH Standards
3. SDH Features and Management
4. Network Generic Applications
5. Network Generic Applications: Equipment and Uses
6. Cross-Connect Types
7. Trends in Deployment
8. Network Design
9. SDH Frame Structure
10. Virtual Containers
11. Supporting Different Rates
Self-Test
Glossary
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Self-Test
1. The removal of which constraints allowed the development of SDH and SONET features?
a. shortage of optical fibers
b. costs of digital devices
c. cost of transmission bandwidth
d. regulations on competition
e. limitations of laser technology
f. both b and c
2. SDH traffic interfaces are defined only for optical interfaces.
a. true
b. false
3. Standards for network management allow interworking of all management functions between vendors via the fiber.
a. true
b. false
4. How long does SDH circuit recovery take?
a. microseconds
b. milliseconds
c. seconds
d. minutes
e. hours
f. b, c, and d
5. Higher-order SDH cross-connects route what entity?
a. 1.5 Mbps
b. ATM cells
c. management data channels
d. payload within 155 Mbps
6. The installation of an SDH network requires that the network topology be changed.
a. true
b. false
7. What is a TUG?
a. a fiber interface on a multiplexer
b. a managed group of tributary units
c. a column of the payload structure
d. part of the management overheads
8. Concatenation provides which benefit?
a. interworking between vendors
b. better system reliability
c. management of very large payloads
d. operation over radio systems
9. Scrambling is used in SDH for which reason?
a. to randomize the bit sequence for better transmission performance
b. to reduce the power consumption of equipment
c. to allow for upgrades to higher bit rates
d. to prevent unauthorized access
10. PDH is the predecessor of both SDH and SONET.
a. true
b. false

Glossary >>

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