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Telekommunikation (S2) > Test fragen > Flashcards

Test fragen Flashcards

1
Q

Outline the main EDFA components

A

Optical isolator
Optical filter
Optical Pump
Doped fibre

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2
Q

The main advantages of SDH over PDH are?

A
  • High transmission rates
  • Simplified Add & Drop functionality
  • Bandwidth for OAM&P purpose
  • Pointers
  • Network Management
  • Interconnection
  • Enhanced performance monitoring
  • Future ready technology
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3
Q

What is a splitter (ADSL)?

A

A splitter is an electronic low pass filter that seperates the analog voice or ISDN signal from ADSL data frequencies

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4
Q

What is LDP?

A
  • LDP is defined for the purpose of distributing labels in an MPLS environment.
  • LDP is defined by the IETF in RFC 5036
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5
Q

What is the difference between WDM and FDM?

A

None, it is the same concept

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6
Q

Which one is more critical regarding xDSL?

A

NEXT is more critical for DSL systems than FEXT

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7
Q

In combination with which request is an ack-request allowed

A

INVITE

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8
Q

Link-state routing protocols are:

A
  • Ospf
  • Is-is
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9
Q

MPLS main components are:

A
  • Ingress LSR
  • Core LSR
  • Engress LSR
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10
Q

Telekommunikation bezeichnet den informationsaustausch via räumlicher Distanz zum Benutzer (Früher Fernmeldewesen genannt) –> Heute:

A

Versteht man darunter den Datenaustausch moderner übertragungstechniken unter zuhilfenahme von Elektronik und Elektrotechnik

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11
Q

The basic idea of adsl is to divide the available frequency spectrum into three different channels

A
  • Telephony services channel
  • Upstream channel (16-640 kbit/s)
  • Downstream channel (up to 9 Mbit/s).
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12
Q

There are types of amplifiers and regenerators

A
  • 1R Amplificatino
  • 2R Amplification and reshaping
  • 3R Amplification, reshaping and retiming
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13
Q

Two types of crosstalk pose potential problems for DSL Systems

A
  • Far end crosstalk
  • Near end crosstalk
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14
Q

What are main sip tasks

A
  • User location
  • User availability
  • User capabilities
  • Session setup
  • Session management
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15
Q

What are the benefits of MPLS VPN

A

Scalable VPNs

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16
Q

What are the main adsl components:

A
  • ADSL modem at the customer premises
  • Modem of the central office
  • DSLAM (DSL access multiplexer)
  • Splitter
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17
Q

What are the main benefits of optical networks:

A
  • Fiber Capacity
  • Restoration Capability
  • Reduced Cost
  • Wavelength Services
18
Q

What are the main tasks of LDP

A
  • Label Distribution and Management
  • Discovery of neighbour LSRs
  • Establishing and Maintaining LDP Sessions
  • Monitoring and notification of errors
19
Q

What are the tasks of POH?

A
  • Alarming
  • Error monitoring for VC
  • Information about the content of VC
  • Indication of path connectivity
  • Maintenance functions
20
Q

What is a B2BUA (functionality)

A
  • He can also initiate a new session
  • He can terminate an existing session
  • He forwards SIP messages
  • He provides a similar functionality as a proxy server
  • He can also maintain media streams related to the session
21
Q

What is a splitter (ADSL)

A

A splitter is an electronic low pass filter that seperates the analog voice or ISDN signal from ADSL data frequencies

22
Q

What is behind the term php

A

It refers to the process whereby the outermost label of an MPLS tagged packet is removed by a LSR before the packet is passed to an adjacent egress LSR

23
Q

What is true concerning labeling in MPLS

A

MPLS inserts a MPLS label between the 2nd and 3rd layer of each packet

24
Q

What is optical attenuation

A
  • impurities reducing the optical throughput of the fiber
  • Hydroxyl radical (OH radical) causing strong attenuation
25
Q

What is SDH

A

basis for a powerful backbone network

26
Q

What is the basic idea of WDM single optical fibre

A

The sending of many different wavelengths down the same optical fibre

27
Q

What is the difference between FDM and EC?

A
  • The EC design is more flexible for changing upstream capacity!!
  • The main disadvantage of EC is the requirement for echo cancellation logic!!
28
Q

What is the purpose of the via header field

A

Routing of response

29
Q

Main purpose of SOH is to provide:

A
  • Service channels,
  • error monitoring,
  • Operational functions,
  • Automatic protection switching
  • Maintenance functions,
  • Data communication channels
30
Q

What is usually carried in the body of an INVITE request

A
  • Session information
  • Connection information
  • Time zone
  • Session description URI
  • Bandwidth information
31
Q

What kind of DSL do you know

A

Alles

32
Q

Which kind of dispersion are there

A

Mode dispersion
Chromatische Dispersion / Materialdispersion)
Polarisierende Modendispersion

33
Q

Which modulation technologies can be used for ADSL

A
  • CAP
  • QAM
  • DTM
34
Q

Which network elements are defined in SIP

A

alles

35
Q

Which one is more critical regarding xDSL

A

NEXT is more critical for DSL systems than FEXT

36
Q

Which optical components do you know?

A

alles

37
Q

Which technology has been replaced by SDH

A

PDH

38
Q

Why is ADSL asymmetrical

A

ADSL supports different data rates upstream and downstream

39
Q

Was bedeutet Cell Breathing?

A
  • Soft Handover zur z.B. nächsten UMTS Zelle
  • Handover ins z.B. GSM Netz
  • Verringerung des Versorgebereiches
  • Reduktion der Datenrate
40
Q

Die Verschiedenen Dimensionen des Multiplexverfahren betrifft:

A

Alles (code, zeit, raum, frequenz)

Telekommunikation (S2) (1 decks)

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