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LDCE MGMT > Terrestrial Radio links, MLLN, Plng&Inst > Flashcards

Terrestrial Radio links, MLLN, Plng&Inst Flashcards

1
Q

Microwave links are Sensitive to high pollen count T/F

A

T

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2
Q

Signals can be degraded during Solar proton event T/F

A

T

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3
Q

_______ allot m/w frequencies spectrum, on the basis of various wireless users
1) ITU
2) WPC
3) IEEE

A

wireless planning and co–ordination wing (WPC) of the ministry of communication

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4
Q

various wireless users classified as
_____ and _________

A

general users and major users

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5
Q

BSNL has been nominated as a major wireless user by the WPC in year _______

A

1981

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6
Q

In India the first M/w System was completed in December, 1965 between ___and ___with a system capacity of _____ channels

A

Kolkata and Asansol with a system capacity of 1200 channels

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7
Q

two RF channels are kept as a standby which are switched over automatically on fading or equipment failure.

A

T

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8
Q

Usually the system with capacities up to ___ channels is called narrow band system.

A

300

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9
Q

systems providing more than ___ channels are called wide band system

A

300

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10
Q

M/W systems used to provide communication on major trunk routes with high traffic density and serving long distances are classified as _____ m/w systems

A

long haul m/w systems

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11
Q

Systems used to provide communication over short distances for trunk routes with light traffic density are classified as ______ m/w system

A

short haul m/w system

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12
Q

2, 4, and 6 GHz systems are _________ (short/long) haul systems.

A

long haul m/w systems

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13
Q

7 and 11 GHz systems are _________ (short/long) haul systems

A

short haul m/w systems

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14
Q

The transmission capacities available on digital radio systems are
integral multiples of ______ hierarchical bit rates and are classified into small, medium and
large or high capacity systems.

A

PCM

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15
Q

Bit rates for Low-capacity systems

A

704 kbps, 2 mbps and 8 mbps

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16
Q

Bit rates for Medium capacity systems

A

34 mbps

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17
Q

Bit rates for High-capacity systems

A

140 mbps

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18
Q

704 kbps system corresponds to capacity of ____ channels

A

10 channels

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19
Q

Small capacity radio systems
1) 10 channel and higher
2) UHF
3) 1+0 unprotected configuration
upto 8mbps
4) All of the above

A

All of the above

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20
Q

linking an RAX to the nearest large exchange
1) 10 channel systems
2) 2mbps systems
3) 2-8 mbps systems in 18-20GHz
4) 8 mbps systems in 2GHz

A

10 channel systems

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21
Q

linking secondary switching area centre to concentration points in the rural areas of a secondary switching area
1) 10 channel systems
2) 2mbps systems
3) 2-8 mbps systems in 18-20GHz
4) 8 mbps systems in 2GHz

A

2mbps systems

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22
Q

applied with integral antenna, mounted on a mast and will have point to multipoint application. suitable for business networks in large urban centers.
1) 10 channel systems
2) 2mbps systems
3) 2-8 mbps systems in 18-20GHz
4) 8 mbps systems in 2GHz

A

2-8 mbps systems in 18-20GHz

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23
Q

2-8 mbps systems hop lengths are likely to be a few kilometres depending on rainfall statistics in a given area.
T/F

A

T

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24
Q

suitable for application as a short haul system and will find application in the rural network for linking either secondary switching areas to their next higher TAXs or linking the secondary switching centre to trunk
concentration points in the rural area
1) 10 channel systems
2) 2mbps systems
3) 2-8 mbps systems in 18-20GHz
4) 8 mbps systems in 2GHz

A

8 mbps systems in 2GHz

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25
Q

long hope is possible in
1) 10 channel systems
2) 2mbps systems
3) 2-8 mbps systems in 18-20GHz
4) 8 mbps systems in 2GHz

A

8 mbps systems in 2GHz
The type of antenna used will be grid paraboloid.

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26
Q

The type of antenna used will be
grid paraboloid.
1) 10 channel systems
2) 2mbps systems
3) 2-8 mbps systems in 18-20GHz
4) 8 mbps systems in 2GHz

A

8 mbps systems in 2GHz

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27
Q

________ is to be used in the trunk network with longer hops
1) 2 GHz, 34 Mb/s
2) 2 GHz, 8 Mb/s
3) 18-20GHz, 2-8 Mb/s
4) 7GHz, 34 Mb/s

A

2 GHz, 34 Mb/s
Medium capacity system

28
Q

________ is to connect primary switching centres to secondary switching centres
1) 2 GHz, 34 Mb/s
2) 2 GHz, 8 Mb/s
3) 18-20GHz, 2-8 Mb/s
4) 7GHz, 34 Mb/s

A

7GHz, 34 Mb/s
Medium capacity system
4PSK modulation

29
Q

________ is used almost exclusively in the junction
network in large urban telephone systems
1) 2 GHz, 34 Mb/s
2) 2 GHz, 8 Mb/s
3) 13 GHz, 34 Mb/s
4) 7GHz, 34 Mb/s

A

13 GHz, 34 Mb/s
Medium capacity system
4PSK modulation

30
Q

________ is used for long haul trunk
routes between major cities
1) 13 GHz, 34 Mb/s
2) 7GHz, 34 Mb/s
3) 6GHz, 140 Mb/s

A

6GHz, 140 Mb/s
High Capacity Digital Radio Systems
used in the N+1 mode with N=7

31
Q

High-Capacity Digital Radio Systems use adaptive equalisers
1) band transversal equalizer
2) IF band resonance equalizer

A

both
band transversal equaliser to minimize intersymbol interference
IF band resonance equalizer to equalize notch and slope besides using space diversity

32
Q

In MLLN, Bandwidth of a leased line can be
1) E0
2) E1
3) E3

A

1, 2 and in between
(E0 Interface) at 64Kbps and n x 64 Kbps up to a
maximum of 2 Mbps (E1 Interface)

33
Q

In MLLN, All operations & maintenance is carried out through
1) NMS
2) ROT
3) NTU

A

ROT (Remote Operating Terminal)

34
Q

In MLLN, supports service provisioning, Network optimization, planning & service monitoring.
1) NMS
2) ROT
3) NTU

A

NMS

35
Q

In MLLN, recovery Management process is
1) automatic
2) manual

A

both

36
Q

In MLLN, range in single copper pair is
1) 64 kbps : 4 kms & for 2mbps : 2 kms
2) 64 kbps : 7 kms & for 2mbps : 3.5 kms
3) 64 kbps : 8 kms & for 2mbps : 4 kms
4) 64 kbps : 10 kms & for 2mbps : 5 kms

A

64 kbps : 7 kms & for 2mbps : 3.5 kms

37
Q

w.r.t MLLN, IPLC stands for

A

International Private Leased Circuits

38
Q

MLLN applications include
1) VPN on MLLN
2) Hotline for voice
3) Extension of VPN (MPLS)
4) Private data network

A

all of them

39
Q

MLLN applications include
1) LAN interconnection
2) EPABX Interconnection
3) International leased circuits
4) Point-to-point and point-to-multipoint connection

A

all of them

40
Q

MLLN nodes
1) DXC
2) VMUX
3) NTU
4) NMS

A

All of them
DXC (Digital Cross-Connect)
VMUX (Versatile Multiplexer)
NTU (Network Terminating Unit)
NMS (Network Management System)

41
Q

V.54 refers to
1) data communication standard
2) line loop testing
3) multiplexing standard

A

line loop testing

42
Q

MLLN NMS
1) HP Open view
2) Cisco works

A

both
which would reside on SNMP server for managing the servers and IT elements

43
Q

Maximum cross connect capacity of cluster node
1) 64 Mbit/s
2) 128 Mbit/s
3) 256 Mbit/s
4) 512 Mbit/s

A

512 Mbit/s
= 8 x 64Mbit/s
= 64 x 8Mbit/s
= 256 x 2Mbit/s

44
Q

Maximum cross connect capacity of basic node
1) 16 Mbit/s
2) 32 Mbit/s
3) 64 Mbit/s
4) 128 Mbit/s

A

64 Mbit/s
= 8 x 8Mbit/s
= 32 x 2Mbit/s

45
Q

in the ______ the common units
(Control Unit, Cross-connection Unit and Power Supply Unit) are integrated to the node.
1) basic node
2) mini node

A

mini node

46
Q

The largest node of the system
1) cluster node
2) basic node
3) midi node
4) accelerator node

A

cluster node
It is built in Master-slave architecture.

47
Q

It is built in Master-slave architecture.
1) cluster node
2) basic node
3) midi node
4) accelerator node

A

cluster node
The largest node of the system

48
Q

Basic building block of the system
1) cluster node
2) basic node
3) midi node
4) accelerator node

A

basic node

49
Q

Maximum cross connect capacity of Midi, mini and micro nodes
1) 16 Mbit/s
2) 32 Mbit/s
3) 64 Mbit/s
4) 128 Mbit/s

A

64 Mbit/s
same as basic node

50
Q

They can make cross-connections both at time slot and at bit level.
1) basic node
2) midi node
3) mini node
4) micro node

A

micro node
- The cross-connection delay is one frame (125
microsecond).
- do not support CAS signaling

51
Q

_______ do not support CAS signaling
1) basic node
2) midi node
3) mini node
4) micro node

A

micro node
- The cross-connection delay is one frame (125
microsecond).

52
Q

Typically _______ are used as an access level node in a network or as base station transmission equipment in mobile networks
1) basic node
2) midi node
3) mini node
4) micro node

A

mini node

53
Q

It is an access node combining PDH and SDH technologies
1) cluster node
2) basic node
3) midi node
4) accelerator node

A

accelerator node

54
Q

Maximum cross connect capacity of accelerator nodes
1) 16 Mbit/s
2) 32 Mbit/s
3) 64 Mbit/s
4) 128 Mbit/s

A

128 Mbit/s
-Two X-buses and consequently 2 x 64 Mbps
-Cross connections are done only at TS level, 64 kbps.

55
Q

It is an access node used for DSLAM
1) basic node
2) midi node
3) switch node
4) accelerator node

A

accelerator node

56
Q

It is an N.E with ADM, LTM and SDXC
1) basic node
2) midi node
3) switch node
4) accelerator node

A

switch node

57
Q

shorter OFC links use
1) 1310 nm lasers on regular single mode fiber (G.652)
2) Non-Zero dispersion shifted fiber optimized for operation with 1550 nm lasers (G.655)

A

1310 nm lasers on regular single mode fiber (G.652)

58
Q

Non-Zero dLonger links for STH/DWDM will use
1) 1310 nm lasers on regular single mode fiber (G.652)
2) Non-Zero dispersion shifted fiber optimized for operation with 1550 nm lasers (G.655)

A

Non-Zero dispersion shifted fiber optimized for operation with 1550 nm lasers (G.655)

59
Q

Ideally, there should be at least _______ dB less loss in the cable plant than the link dynamic range to allow for component degradation and potential restoration splicing.
1) 1 dB
2) 2 dB
3) 3 dB
4) 5 dB

A

3 dB

60
Q

To calculate the worst-case estimate of power budget (PB), you assume minimum transmitter power (PT) and minimum receiver sensitivity (PR)
1) PB = PT + PR
2) PB = PT – PR
3) PB = PR – PT
4) PB = PT – PR - 3dB

A

PB = PT – PR

61
Q

The difference between minimum transmitter power (PT) and minimum receiver sensitivity (PR)
1) power margin (PM)
2) power budget (PB)
3) link loss (LL)

A

power budget (PB)

62
Q

The link loss is the difference between
1) minimum transmitter power (PT) and power margin(PM)
2) minimum transmitter power (PT) and power budget (PB)
3) power budget (PB) and power margin(PM)
4) minimum receiver sensitivity (PR) and minimum transmitter power (PT)

A

power budget (PB) and power margin(PM)
LL = PB - PM
or PM = PB – LL
i.e. PM = PT - PR - LL

63
Q

The distance between two suits in DTS may be taken as
1) 0.5 meter
1) 1.0 meter
1) 1.5 meter
1) 2.0 meter

A

1.5 meter

64
Q

There should be more than ___mm space between two rows of racks and between wall and racks for operators to open the racks.
1) 400mm
2) 600mm
3) 800mm
4) 1000mm

A

800mm

65
Q

Typical types of antennas used in radio relay link installations are
1) parabolic reflectors
2) horn radiators
3) both

A

both

66
Q

Terrestrial Radio links use ____ band
1) UHF
2) VHF
3) SHF
4) EHF

A

SHF: 3-30GHz

LDCE MGMT (16 decks)

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