Exercise 2.2: xDSL Variants - Revision history

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	[[Category:Examples of Communication Systems: Exercises\|^2.2 xDSL Systems		[[Category:Examples of Communication Systems: Exercises\|^2.2 xDSL Systems
	^]]		^]]
	[[de:2.2:~~_xDSL–Varianten~~]]		[[de:Aufgabe 2.2: xDSL–Varianten]]

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	[[Category:Examples of Communication Systems: Exercises\|^2.2 xDSL Systems		[[Category:Examples of Communication Systems: Exercises\|^2.2 xDSL Systems
	^]]		^]]
			[[de:2.2:_xDSL–Varianten]]

Guenter at 09:16, 22 March 2023

2023-03-22T09:16:46Z

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	[[File:~~P_ID1929__Bei_A_2_2~~.png\|right\|frame\|~~Vorgegebene xDSL–Konfiguration~~]]		[[File:EN_Bei_T_2_2_S4.png\|right\|frame\|ADSL connection from the end customer to the local exchange]]

	$\rm xDSL$  is a very broad generic term that includes a whole range of different system variants for fast Internet access:		$\rm xDSL$  is a very broad generic term that includes a whole range of different system variants for fast Internet access:

Noah at 14:49, 5 March 2023

2023-03-05T14:49:46Z

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	<quiz display=simple>		<quiz display=simple>

	{ ~~Welche xDSL–Variante ist~~ in ~~der Grafik dargestellt~~?		{ Which xDSL variant is shown in the graphic?
	\|type="()"}		\|type="()"}
	+ ADSL,		+ ADSL,
	- VDSL.		- VDSL.

	{ ~~Welche Aussagen stimmen~~:  ~~Bei~~ xDSL ~~liegt der Glasfaser–Abschlusspunkt~~		{ Which statements are true:  With xDSL, the optical fiber termination point is located
	\|type="[]"}		\|type="[]"}
	- ~~immer~~ in ~~der Ortsvermittlungsstelle~~,		- always in the local exchange,
	+ im so ~~genannten~~ DSLAM,		+ in the so-called DSLAM,
	- ~~beim Endkunden~~.		- at the end customer.

	{ ~~Das Telefonsignal~~ (analog ~~oder~~ ISDN) ~~und das xDSL–Signal werden getrennt~~		{ the telephone signal (analog or ISDN) and the xDSL signal are separated
	\|type="[]"}		\|type="[]"}
	- ~~mit Hilfe eines Routers~~,		- with the help of a router,
	- ~~des~~ DSLAM,		- the DSLAM,
	- ~~des DSL–Modems~~,		- the DSL modem,
	+ ~~des Splitters~~.		+ the splitter.

	{ ~~Welche der folgenden Aussagen sind richtig~~?		{ Which of the following statements are correct?
	\|type="[]"}		\|type="[]"}
	+ ~~Bei~~ ADSL ~~sind stets~~ 32 kbit/s ~~für Verwaltungsdaten reserviert~~.		+ With ADSL, 32 kbit/s are always reserved for management data.
	- ~~Bei~~ ADSL2 ~~sind stets~~ 32 kbit/s ~~für Verwaltungsdaten reserviert~~.		- With ADSL2, 32 kbit/s are always reserved for management data.
	+ ~~Eine Neuerung bei~~ ADSL2 ~~ist~~  ''Seamless Rate Adaption''.		+ An innovation in ADSL2 is  ''Seamless Rate Adaption''.
	- VDSL(2) ~~bietet stets eine höhere Datenrate als~~ ADSL2+.		- VDSL(2) always offers a higher data rate than ADSL2+.


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	</quiz>		</quiz>

	===~~Musterlösung~~===		===Solution===
	{{ML-Kopf}}		{{ML-Kopf}}
	'''(1)'''  ~~Richtig ist der~~ <u>~~Lösungsvorschlag~~ 1</u>: ~~Die Grafik zeigt~~ ADSL.		'''(1)'''  Correct is the <u>proposed solution 1</u>: The graphic shows ADSL.
	*~~Bei~~ VDSL ~~ist der~~ DSLAM (''Digital Subscriber Line Access Multiplexer'') in ~~den Kabelverzweiger verlegt~~.		*In VDSL, the DSLAM (''Digital Subscriber Line Access Multiplexer'') is located in the cable branch.



	'''(2)'''  ~~Richtig ist allein~~ <u>~~der Lösungsvorschlag~~ 2</u>:		'''(2)'''  Only <u>the proposed solution 2</u> is correct:
	*~~Der Glasfaser–Abschlusspunkt liegt bei~~ DSL ~~meist im DSLAM~~. ~~Nur~~ in ~~der ADSL–Variante befindet sich der~~ DSLAM in ~~der Ortsvermittlungsstelle~~.		*The fiber termination point is usually in the DSLAM in DSL. Only in the ADSL variant is the DSLAM located in the local exchange.
	*~~Dagegen ist der~~ DSLAM in ~~der VDSL–Variante im Kabelverzweiger~~ (~~oder für die~~ VDSL(2)~~– Variante im~~ ''Outdoor DSLAM'' ~~neben dem Kabelverzweiger~~) ~~untergebracht, um die „Last Mile”~~ (~~Länge der Kupferleitung~~) ~~zu reduzieren und somit höhere Datenraten zu erreichen~~.		*In contrast, the DSLAM in the VDSL variant is located in the cable distribution frame (or for the VDSL(2) variant in the ''Outdoor DSLAM'' next to the cable distribution frame) in order to reduce the "last mile" (length of the copper line) and thus achieve higher data rates.
	*~~Der Glasfaserabschluss befindet sich nur dann beim Endkunden, wenn FttH– oder FttB–Technologien eingesetzt werden~~.		*The fiber optic termination is located at the end customer only if FttH or FttB technologies are used.
	*~~Es handelt sich dann allerdings nicht mehr um~~ DSL.		*However, it is then no longer DSL.



	'''(3)'''  ~~Richtig ist allein~~ <u>~~der Lösungsvorschlag~~ 4</u>:		'''(3)'''  Only <u>the proposed solution 4</u> is correct:
	*~~Der~~ ''~~Splitter~~'' ~~beinhaltet je ein Tiefpass– und ein Hochpassfilter~~.		*The ''splitter'' contains one low-pass and one high-pass filter.
	*~~Er kann damit die niedrigen Frequenzen~~ (~~Telefonsignal~~) ~~von den höheren Frequenzen~~ (~~xDSL–Signal~~) ~~trennen~~.		*It can thus separate the low frequencies (telephone signal) from the higher frequencies (xDSL signal).



	'''(4)'''  ~~Richtig sind die~~ <u>~~Aussagen~~ 1 ~~und~~ 3</u>:		'''(4)'''  Correct are<u>statements 1 and 3</u>:
	*~~Bei ADSL–Systemen werden tatsächlich stets~~ 32 kbit/s ~~für Verwaltungsdaten reserviert~~.		*In fact, ADSL systems always reserve 32 kbit/s for administrative data.
	*~~Dagegen kann bei~~ ADSL2 ~~die Länge des Overheads zwischen~~ 4 kbit/s ~~und~~ 32 kbit/s ~~variieren~~. ~~Bei einer Reduzierung erreicht man eine höhere Nutzdatenrate~~.		*In contrast, with ADSL2 the length of the overhead can vary between 4 kbit/s and 32 kbit/s. If it is reduced, a higher user data rate is achieved.
	*~~Die Aussage~~ 3 ~~ist richtig~~: ~~Durch die Aufnahme von~~ ''Seamless Rate ~~Adaption~~'' in ~~den Standard kann ein eventueller Verlust der Synchronisation bei einer Variation der Kanalgüte vermieden werden~~.		*Statement 3 is correct: By including ''Seamless Rate Adaptation'' in the standard, a possible loss of synchronization in case of a variation of the channel quality can be avoided.


	~~Dagegen ist die letzte Aussage falsch~~:		In contrast, the last statement is incorrect:
	*~~Die maximal erreichbare Datenrate beträgt bei~~ VDSL(2) ~~zwar~~ (~~theoretisch~~) 250 Mbit/s. ~~Die Datenrate sinkt aber bei einer Entfernung von 500 Meter auf bis zu~~ 100 Mbit/s. ~~Bei~~ 2000 ~~Meter Kupferleitung beträgt sie sogar weniger als~~ 10 Mbit/s.		*The maximum achievable data rate for VDSL(2) is indeed (theoretically) 250 Mbit/s. However, the data rate drops to as low as 100 Mbit/s at a distance of 500 meters. At 2000 meters of copper line, it is even less than 10 Mbit/s.
	*ADSL2+ ~~erreicht dagegen maximal „nur”~~ 25 Mbit/s, ~~aber die Datenrate nimmt bei größerer Entfernung deutlich langsamer ab als~~ VDSL(2) ~~und beträgt bei 2000 Meter ungefähr noch~~ 15 Mbit/s. ~~Der „Schnittpunkt” liegt bei ungefähr~~ 1500 m.		*ADSL2+, on the other hand, achieves a maximum of "only" 25 Mbit/s, but the data rate decreases much more slowly than VDSL(2) at greater distances and is still approximately 15 Mbit/s at 2000 meters. The "intersection point" is at about 1500 meters.

Noah at 14:43, 5 March 2023

2023-03-05T14:43:10Z

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	{{quiz-Header\|Buchseite=~~Beispiele von Nachrichtensystemen~~/~~xDSL–Systeme~~		{{quiz-Header\|Buchseite=Examples_of_Communication_Systems/xDSL_Systems
	}}		}}

	[[File:P_ID1929__Bei_A_2_2.png\|right\|frame\|Vorgegebene xDSL–Konfiguration]]		[[File:P_ID1929__Bei_A_2_2.png\|right\|frame\|Vorgegebene xDSL–Konfiguration]]

	$\rm xDSL$  ~~ist ein sehr weit gefasster Oberbegriff, der eine ganze Reihe verschiedener Systemvarianten für schnellen Internetzugang beinhaltet~~:		$\rm xDSL$  is a very broad generic term that includes a whole range of different system variants for fast Internet access:

	*$\rm ADSL$:  ''Asymmetric Digital Subscriber Line'',		*$\rm ADSL$:  ''Asymmetric Digital Subscriber Line'',

	*~~die Erweiterungen~~  $\rm ADSL2$  ~~und~~  $\rm ADSL2+$,		*the extensions  $\rm ADSL2$  and  $\rm ADSL2+$,

	*$\rm VDSL$:  ''Very ~~high–speed~~ Digital Subscriber Line'', in ~~Deutschland das System~~  $\rm VDSL(2)$.		*$\rm VDSL$:  ''Very high-speed Digital Subscriber Line'', in Germany the system  $\rm VDSL(2)$.


	~~Die Aufgabe beinhaltet einige allgemeine Fragestellungen zu den drei oben genannten Systemvarianten~~.		The exercise includes some general questions about the three system variants mentioned above.


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	~~''Hinweise~~:''		Hints:

	*~~Die Aufgabe gehört zum Kapitel~~  [[Examples_of_Communication_Systems/~~xDSL–Systeme~~\|~~xDSL–Systeme~~]].		*This exercise belongs to the chapter  [[Examples_of_Communication_Systems/xDSL_Systems\|"xDSL Systems"]].
	*~~Die Grafik zeigt die Ortsvermittlungsstelle sowie den Kabelverzweiger einer der oben genannten Varianten~~.		*The graphic shows the local exchange as well as the cable branch of one of the above mentioned variants.


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	===~~Fragebogen~~===		===Questions===
	<quiz display=simple>		<quiz display=simple>

Guenter at 12:59, 5 March 2023

2023-03-05T12:59:43Z

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	[[Category:Examples of Communication Systems: Exercises\|^2.2 ~~DSL~~ Systems		[[Category:Examples of Communication Systems: Exercises\|^2.2 xDSL Systems
	^]]		^]]

Guenter at 12:57, 5 March 2023

2023-03-05T12:57:38Z

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	[[Category:Examples of Communication Systems: Exercises\|^2.2 ~~xDSL–Systeme~~		[[Category:Examples of Communication Systems: Exercises\|^2.2 DSL Systems
	^]]		^]]

Guenter: Guenter moved page Aufgabe 2.2: xDSL–Varianten to Exercise 2.2: xDSL Variants

2023-03-05T12:55:18Z

Guenter moved page Aufgabe 2.2: xDSL–Varianten to Exercise 2.2: xDSL Variants

← Older revision	Revision as of 14:55, 5 March 2023
(No difference)

Javier: Text replacement - "Category:Aufgaben zu Beispiele von Nachrichtensystemen" to "Category:Examples of Communication Systems: Exercises"

2021-03-23T12:51:03Z

Text replacement - "Category:Aufgaben zu Beispiele von Nachrichtensystemen" to "Category:Examples of Communication Systems: Exercises"

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	[[Category:~~Aufgaben zu Beispiele von Nachrichtensystemen~~\|^2.2 xDSL–Systeme		[[Category:Examples of Communication Systems: Exercises\|^2.2 xDSL–Systeme
	^]]		^]]

Javier: Text replacement - "[[Beispiele_von_Nachrichtensystemen" to "[[Examples_of_Communication_Systems"

2020-07-09T12:50:43Z

Text replacement - "[[Beispiele_von_Nachrichtensystemen" to "[[Examples_of_Communication_Systems"

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	''Hinweise:''		''Hinweise:''

	*Die Aufgabe gehört zum Kapitel  [[~~Beispiele_von_Nachrichtensystemen~~/xDSL–Systeme\|xDSL–Systeme]].		*Die Aufgabe gehört zum Kapitel  [[Examples_of_Communication_Systems/xDSL–Systeme\|xDSL–Systeme]].
	*Die Grafik zeigt die Ortsvermittlungsstelle sowie den Kabelverzweiger einer der oben genannten Varianten.		*Die Grafik zeigt die Ortsvermittlungsstelle sowie den Kabelverzweiger einer der oben genannten Varianten.