Download Week 01 Lecture

DCCT 4020 –BROADBAND COMMUNICATIONS
FINAL ASSIGNMENT
NAME:
_____________________________
STUDENT #: _____________________________
Hyder Khoja P.Eng
1. Sonet operates on a clock called-----------------whose accuracy is --------parts in one
billion parts.
2. All clocks of T-carrier system are synchronized with a reference clock. T- F
3. Plesichronous and synchronous mean one and the same thing.
T- F
4. One of the main advantages of SONET is that it allows synchronous ------------- of
asynchronous payloads.
5 What do the following abbreviations stand for:
SDH:----------------------------------------DCS:----------------------------------------SPE:-----------------------------------------6. SONET’s highest transport rate is ---------------------------Gbps
7. The equipment responsible for converting user payload into a standard STS
Format is called ---------------------.
8. The user portion of SPE contains -----------------------bytes.
9. The purpose of the virtual tributaries is to allow --------------to be carried in an SPE.
(more than one answers)
a)
STS-1 signals b) sub STS-1 signals c)
CEPT-1 signals
d)
OC-3 signals
e) ATM cells
10. There are ------------VT1.5 or --------------VT6 or -----------------VT2 or -----------VT3 in a VT group
11. Each VT group data rate is-------------------Mbps.
12. When an SPE is used to carry VT groups, what is carried in the first column of
The SPE.-----------------------13. When the input is running slower than the frame, the transmitter will:
(a)
Invert D bits (b) Perform Negative justification (c) Inserts stuff byte after
H3 (d) Decrement pointer value by one (e) None of the above
Fig below shows the contents of payload pointer for normal operation. Assuming that the
input is running slower than the frame, show the contents of the H1,H2, H3 bytes and the
location of the start of payload after the transmitter performs frequency justification.
N D F
I D I D I D I D I D
0 1 1 0 0 0 0 0 0 1 0 1 1 0 0 1
14. Name two functions performed by section overhead that are not performed by
line overhead. ------------------------------------------15. Which overhead bytes compensate for timing variations. ---------- ---------- ----16. The C1 value for the 7th STS-1 signal in an STS 12 frame would be -----------------.
17. List three types of commercially available SONET equipment.
------------------------------------------------ ------------------------18. List four most popular OC rates in North America. ---------- ---------- ----------
ATM TEST - Part 1
1. Circle true or false:
(a) ATM is a connection oriented service
T-F
(b) ATM does not provide any flow control between the user
and the network
T-F
(c) Routing and multiplexing in ATM is the responsibility of the
AAL layer
T-F
(d) The term Asynchronous in ATM means variable data rates T - F
(e) A VPI can carry up to 212 VCI’s
T-F
2. Fill in the blanks.
(a) User information is converted into ATM format by the
_____________________________ sublayer.
(b) In an ATM network, cell switching and routing is the responsibility of the
_____________________________ layer.
(c) Cell delineation and frame generation in ATM is the responsibility of the
_____________________________ sublayer.
(d) Disassembly and assembly of user traffic is the responsibility of the
_____________________________ sublayer of the ATM.
(e) In ATM, flow control and cell multiplexing is performed by
_____________________________ layer.
3. ATM implements following layers:
(a) Physical and data link
(b) Physical and network
(c) Physical and AAL
(d)
Physical, ATM, and AAL
4.
Show how ATM AAL5 will process 280 bytes of Data. Show complete segmentation,
number of Cells required and the number of padding bytes. Show the contents of last cell. How
would the receiver now it is the last cell?
5. Which of the following application does not require a timing relationship between
the transmitter and the receiver?
(a) Compressed video
(b) Circuit emulation
(c) DSI signal carrying PCM voice
(d) Constant bit rate video
(e) X.25 traffic
6. Which AAL type processes constant bit rate voice and video?
(a) AAL 3/4
(b) AAL 2
(c) AAL 1
(d) AAL 5
(e) none of the above
7. A VPI is logically equivalent to:
(a) The subscriber’s loop in a public telephone network
(b) An individual telephone line
(c) A telephone cable carrying several circuits terminating in a central office.
(d) Twisted wire pair carrying a telephone conversation.
(e) None of the above.
8. The unassigned cells in an ATM network are used.
(a) to fill the available band width
(b) to adapt the speed of transmission to the required application
(c) to align the boundaries of bit transmission
(d) for network diagnostics functions
(e) for network internal communications
ADSL
1 .____________ has a higher transmission rate in the downstream direction than in
the upstream direction.
(a)
(b)
(c)
(d)
VDSL
ADSL
SDSL
(a) and (b)
2. ____________is suitable for businesses that require comparable upstream and downstream
data rates
(e)
VDSL
(f)
ADSL
(g)
SDSL
(h)
(a) and (b)
3. DMT is a modulation scheme that combines elements of _______ and _______
(a)
(b)
(c)
(d)
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FDM; TDM
QDM;QAM
FDM;QAM
PSK; FSK
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4.
The largest portion of the bandwidth for ADSL carries______________
(a)
Voice communication
(b)
Upstream Data
©
Downstream data
(d)
Control Data
5.
____________ is a device at the Telephone company site that can packetize data to be
sent to the ISP server
(a)
(b)
(c)
(d)
A DSLAM
An ADSL Modem
A Filter
A Splitter
6. . __________________ Encoded Data is more susceptible to attenuation than ________
encoded data
(a)
(b)
(c)
(d)
An AMI ; a 2B2Q
A 2B1Q ; an AMI
An AMI ; a 2B1Q
None of the above
7 .The practical upper limit of length of ADSL is ____________.
a. 6,000 ft
b. 12,000 ft
c. 18,000 ft
d. 36,000 ft
8. The DSLs that target symmetric transmission applications include all but which of
the following?
e.
f.
g.
h.
i.
MSDSL
HDSL
ADSL
SDSL
ISDN
9. Which of the following statements about VDSL is not true?
j.
k.
l.
m.
VDSL is both symmetric and asymmetric
VDSL has a longer range in the loop
VDSL is nearly ten times faster than ADSL
VDSL is over thirty times faster than HDSL
9. In ADSL, channels _______ to _________ are reserved for upstream transmission
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a. 6 to 30
b. 31 to 255
c. 30 to 254
d. 5 to 31
e. 4 to 30
10. The maximum theoretical downstream BW for Cable Modems is:
a.
30MHZ
b.
6MHZ
c.
42MHZ
d.
60MHZ
VOIP
1.
List 3 functions performed by a Gateway:
___________________
__________________________ ______________________
2. A Gatekeeper performs which of the following functions:
a.
b.
c.
d.
e.
56.
Admission Control
Capability Negotiations
Call Setup
Call Termination
User Location
Name a device needed to manage Multiparty conferences: ___________
57. Specify 3 most important QoS parameters for VOIP conversation.
_________________ ____________________ ______________________
58.Sketch a diagram showing how a VOIP system is constructed for a Phone –to Phone
Call.
60. Sketch a PBX based VOIP Network linking the branch office a major corporation
with its head office.
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61.Sketch a diagram showing the essential components of VOIP protocol Stack.
62. In addition to digitization, list 5 vital functions required for a viable VOIP Network
implementation.
___________________________
___________________________
____________________________
____________________________
___________________________
65. Which of the following protocols is used to carry the Signalling messages over VOIP
Network
a.
b.
c.
d.
e.
f.
TCP
RSVP
UDP
Q.931
IP
None of the above
66. ITU-T recommends which of the following CODEC for Video transmission
a. G.711
b. H.261
c. G.723
d. G.729
e. H.263
f. (b) & (e)
g. G.722
67. Which of the following CODEC can carry maximum number of calls in the available
BW.
a. G.711
b. G.722
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c. G.729
d. G.723
e. G.721
69. Maximum tolerable jitter for a VOIP call is
a. 200 ms
b. 250ms
c. 300ms
d. 150ms
e. 100ms
71. For a VOIP call, jitter is defined as :
a.
b.
c.
d.
e.
Time delay between the transmission and reception of a voice packet
The number of packet lost
The number of missequenced packets
Variation in the arrival time of VOIP packets at the receiver
None of the above
72. Excessive jitter manifests itself as : __________________________________
74. SIP is a newer protocol proposed by:
a.
b.
c.
d.
e.
ITU-T
ITEF
ANSI
IEEE
ISO
76. SIP is a _______________ Protocol
a.
b.
c.
d.
e.
Signalling
Media transmission
Transport
Routing
None of the above
77. SIP provides following functions:
a.
b.
c.
d.
e.
f.
Call Setup
Call Management
Capability exchange mechanism
User location
All of the above
None of the above
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78. SIP works in conjunction with: Name at least 3 additional protocols.
________________ ______________________
_________________________
81. Show, with the help of a sketch, the encapsulation of SIP data
82. SIP uses a _____________/_______________ Model with ___________/_________.
83. List 4 essential components of SIP Architecture.
_________________ _________________
________________ ________________
84. SIP signaling messages are created by USER _________ Process and response are
created by a USER _____________ Process.
87. SIP messages consist of a ______________ and a Body
88. SIP addresses look like an ____________ address with the word __________ added
in the front
MPLS SECTION:
1.
MPLS converts
(a) L2 routing into L3 Switching
(b) L3 switching into L2 Routing
(c) L3 Routing onto L2 Switching
(d) L4 transport into L2 routing
(e) None of the above
2.
List 4 parameters used to determine the FEC
_____________
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3.
With the Static Explicit Routing in MPLS:
(a)
(b)
(c)
(d)
Each LSR determines the route independently
Routes are manually configured
Routes are pre-configured for all FECs
Routes are dynamically determined by the INGRESS LSR at the time of
arrival of the packet
(e) None of the above
4.
The Label is placed:
(a)
(b)
(c)
(d)
Before the L2 Header
After the L2 Header
After the L3 header
Between the L2 and L3 headers
5.
LDP gathers information regarding______________, to calculate the
Route along the LSP: List 3 parameters.
______________ ___________________ __________________.
6.
Sketch a diagram showing the MPLS Protocol stack architecture.
7.
8.
List 5 steps that must be taken for data to travel through an MPLS Network
Draw a sketch, showing the creation of a tunnel through an MPLS Network
using Label stack
9. What does FEC stands for:________________________________
10. Which of the following is not a feature of the MPLS?
(a)
(b)
(c)
(d)
(e)
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Routing based on Label
Last in Last out
Label binding based on FEC
Tunnel creation
Last in first out
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