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Voice Telephony over Asynchronous Transfer Mode (VToA)

Table of Contents:
Definition and Overview
1. Introduction
2. Traditional Voice Transmission
3. ATM Transmission
4. What Business Problems Can VToA Address?
5. Why Will ATM Dominate Future Markets?
6. Companies with VToA Products
7. Standards Groups
Self-Test
Glossary
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Self-Test
1. Traditional telephone networks are composed of a large number of ______ lines.
a. OC–3
b. wire
c. T1
d. leased
2. The major advantage of ATM over TDM transmission is _________.
a. noise-free transmission
b. fewer trunks required for same number of active calls
c. circuit paths are not used until calls are actually answered
d. out-of-band signaling improves call handling capacity of the network
e. all of the above
3. VToA makes better use of available bandwidth than TDM because __________.
a. VToA is packet switched
b. VToA uses out-of-band signaling, freeing available bandwidth for payload use
c. TDM uses static time slot assignments for payload of each call
d. all of the above
4. ATM has the added advantage over TDM of ________________.
a. higher speed
b. less processing overhead per unit of data transmitted
c. bandwidth on demand
d. built in silence suppression
e. both a and c
f. a, c, and d
g. none of the above
5. Analog noise can be picked up during a call _________________.
a. at any point where the signal is in analog form
b. only with TDM transmission
c. only with ATM transmission
d. while being switched within the PSTN
e. none of the above
6. One reason VToA was developed was to ________________.
a. transmit voice signals in digital form
b. make more efficient use of existing copper circuits
c. free up T1 circuits interconnecting PSTN offices
d. none of the above
7. The original order of ______________ is preserved in both TDM and ATM transmission when it reaches the other end point of the call.
a. voice samples
b. signaling information
c. both a and b
d. none of the above
8. A channelized T1 line can handle up to ___ simultaneous calls using one set of wires.
a. 1
b. 8
c. 16
d. 24
e. 32
f. none of the above
9. ATM Standards help to protect a company's investment because _____________.
a. the future is very uncertain
b. upgrading high-technology equipment is almost a constant need
c. equipment purchased today will work in the future
d. the standards do not permit changes or modifications
10. Support for convergent networks can be best understood through which phrase?
a. ATM supports mixed media
b. ATM interconnects with LANs, MANs, or WANs
c. ATM can integrate any variety of services onto one platform
d. all of the above
e. none of the above
11. The interest for ATM in the telecommunications industry is not very high.
a. true
b. false
12. It has been estimated that ATM networks can support network sizes that are ____________.
a. unlimited in size
b. able to support 1.5 Mbps only
c. never going to surpass 2.5 Gbps
d. depends upon the number of users
Glossary >>

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