Aufgaben:Exercise 1.3Z: ISDN Bus System and Interfaces - Revision history

Maintenance script: Fix interlanguage link: resolve redirect chain

2026-03-16T15:54:47Z

Fix interlanguage link: resolve redirect chain

← Older revision		Revision as of 17:54, 16 March 2026
Line 116:		Line 116:

	[[Category:Examples of Communication Systems: Exercises\|^1.2 ISDN Basic Access^]]		[[Category:Examples of Communication Systems: Exercises\|^1.2 ISDN Basic Access^]]
	[[de:Aufgaben:1.~~3Z_S0–_und_UK0–Schnittstelle~~]]		[[de:Aufgaben:Aufgabe 1.3Z: Bussystem und Schnittstellen von ISDN]]

Maintenance script: Add German interlanguage link

2026-03-16T12:30:20Z

Add German interlanguage link

← Older revision		Revision as of 14:30, 16 March 2026
Line 116:		Line 116:

	[[Category:Examples of Communication Systems: Exercises\|^1.2 ISDN Basic Access^]]		[[Category:Examples of Communication Systems: Exercises\|^1.2 ISDN Basic Access^]]
			[[de:Aufgaben:1.3Z_S0–_und_UK0–Schnittstelle]]

Guenter at 15:52, 24 October 2022

2022-10-24T15:52:46Z

← Older revision		Revision as of 17:52, 24 October 2022
Line 3:		Line 3:
	}}		}}

	[[File:~~P_ID1580__Bei_Z_1_3~~.png\|right\|frame\|Model of ISDN basic rate interface]]		[[File:EN_Bei_Z_1_3.png\|right\|frame\|Model of ISDN basic rate interface]]
	The graphic shows an ISDN transmission system.  One recognizes:		The graphic shows an ISDN transmission system.  One recognizes:
	# The network termination  $\rm (NTBA)$  at the subscriber,		# The network termination  $\rm (NTBA)$  at the subscriber,

Guenter at 16:18, 18 October 2022

2022-10-18T16:18:42Z

← Older revision		Revision as of 18:18, 18 October 2022
Line 73:		Line 73:
	{{ML-Kopf}}		{{ML-Kopf}}

	'''(1)'''  The identifier "$0$" already indicates a <u>basic rate interface</u>. In the case of the primary rate multiplex connection, the interfaces are designated $\rm S_{\rm 2M}$ and $\rm U_{\rm K2}$, while the network termination equipment is designated NTPM (''Network Termination for Primary Rate Multiplex Access'').		'''(1)'''  The identifier  "$0$"  already indicates a  <u>basic rate interface</u>.
			*In the case of the primary rate multiplex connection,  the interfaces are designated  $\rm S_{\rm 2M}$  and  $\rm U_{\rm K2}$,
			*while the network termination equipment is designated  $\rm NTPM$  ("Network Termination for Primary Rate Multiplex Access").



	'''(2)'''  <u>Answer 1</u> is correct:		'''(2)'''  <u>Answer 1</u>  is correct:
	*Each NTBA is connected to the local exchange by a pair of wires. The identifier "K" in $\rm U_{\rm K0}$ indicates a copper line.		*Each NTBA is connected to the local exchange by a pair of wires.  The identifier  "K"  in  $\rm U_{\rm K0}$  indicates a copper line.
	*Only in the case of a [[Examples_of_Communication_Systems/ISDN_Primary_Multiplex_Connection\|"primary rate interface"]] with 30 B channels, one D channel and one synchronization channel is a connection via optical fiber possible.
	*But even for this, copper lines are usually used.

			*Only in the case of a  [[Examples_of_Communication_Systems/ISDN_Primary_Multiplex_Connection\|"primary rate interface"]]  with  $30$  B channels,  one D channel and one synchronization channel a connection via optical fiber is possible.

			*But even for this,  copper lines are usually used.

	~~'''(3)'''  <u>Solution 2</u> is correct:~~
	*In the house connection area, ISDN uses four-wire transmission, with one copper twisted pair for each transmission direction.


			'''(3)'''  <u>Solution 2</u>  is correct:
			*In the house connection area,  ISDN uses four-wire transmission,  with one copper twisted pair for each transmission direction.

	'''(4)'''  <u>Solutions 1 and 3</u> are correct:

			'''(4)'''  <u>Solutions 1 and 3</u>  are correct:
	*A directional separation method is only required for two-wire transmission,		*A directional separation method is only required for two-wire transmission,
	*whereby the simpler method is realized by means of a fork circuit in each NTBA.		*whereby the simpler method is realized by means of a fork circuit in each NTBA.
Line 95:		Line 99:


	'''(5)'''  <u>Solutions 1, 3 and 4</u> are correct:		'''(5)'''  <u>Solutions 1, 3 and 4</u>  are correct:
	*If the length is limited to 150 meters, up to eight terminals can be connected at any point. This is referred to as a short bus.		*If the length is limited to  $150$  meters,  up to eight terminals can be connected at any point.  This is referred to as a  "short bus".
	*An extended bus exists if the line length is 500 meters ~~or less~~.
	*Here, up to four terminal equipment can be connected; these must be concentrated on the last 50 meters before the terminating resistor $(100 \ \rm \Omega)$.		*An  "extended bus"  exists if the line length is up to  $500$  meters.
	*In the case of a single connection, the line length can be increased to one kilometer (long bus).
	*Analog terminal equipment cannot be connected directly to the $\rm S_{0}$ bus, but only via a terminal adapter (TA).		*Here,  up to four terminal equipment can be connected;  these must be concentrated on the last  $50$  meters before the terminating resistor  $(100 \ \rm \Omega)$.

			*In the case of a single connection,  the line length can be increased to one kilometer  ("long bus").

			*Analog terminal equipment cannot be connected directly to the  $\rm S_{0}$ bus,  but only via a terminal adapter  $\rm (TA)$.

Guenter at 15:21, 18 October 2022

2022-10-18T15:21:59Z

← Older revision		Revision as of 17:21, 18 October 2022
Line 4:		Line 4:

	[[File:P_ID1580__Bei_Z_1_3.png\|right\|frame\|Model of ISDN basic rate interface]]		[[File:P_ID1580__Bei_Z_1_3.png\|right\|frame\|Model of ISDN basic rate interface]]
	The graphic shows an ISDN transmission system. One recognizes:		The graphic shows an ISDN transmission system.  One recognizes:
	*the network termination (NTBA) at the subscriber,		# The network termination  $\rm (NTBA)$  at the subscriber,
	*the  $\rm U_{\rm K0}$ interface as the connection between the NTBA and the local exchange (LE),		# the  $\rm U_{\rm K0}$ interface as the connection between the NTBA and the local exchange  $\rm (LE)$,
	*the  $\rm S_{0}$ bus, to which several terminal equipment  (TE)  of the ~~subscriber~~ can be connected.		#the  $\rm S_{0}$ bus,  to which several terminal equipment  $\rm (TE)$  of the subscribers can be connected.


	In the ~~subscriber connection area (between the local exchange and NTBA,~~  $\rm U_{\rm K0}$) two-wire transmission is used for economic reasons.		On the  $\rm U_{\rm K0}$  bus,  two-wire transmission is used for economic reasons.

	To decouple the receiver from its own transmitter, directional separation methods are required:		To decouple the receiver from its own transmitter,  directional separation methods are required:
	*The ''fork circuit''  is a bridge circuit, where an attempt is made to approximate the input impedance  $Z_{\rm L}(f)$  of the copper two-wire line coupled via transformers as closely as possible by means of an artificial line replica  $Z_{\rm N}(f)$.		*The  "fork circuit"  is a bridge circuit,  where an attempt is made to approximate the input impedance  $Z_{\rm L}(f)$  of the copper two-wire line coupled via transformers as closely as possible by means of an artificial line replica  $Z_{\rm N}(f)$.
	*For narrowband signals, the resistance replica of  $Z_{\rm L}(f)$  by  $Z_{\rm N}(f)$  succeeds relatively well, so that the decoupling of transmitter and receiver is ensured by the fork circuit alone.
	*For broadband signals, the ''echo cancellation method''  must also be used. Here, the transmitter emits test signals at regular intervals, measures the received signal and determines the echo impulse response from it.
	*In normal operation, the echo canceller calculates the expected echo of its own transmitter depending on the message and subtracts this from the received signal in a transversal filter whose coefficients are set and readjusted by a powerful processor.

			*For narrowband signals,  the resistance replica of  $Z_{\rm L}(f)$  by  $Z_{\rm N}(f)$  succeeds relatively well,  so that the decoupling of transmitter and receiver is ensured by the fork circuit alone.

			*For broadband signals,  the  "echo cancellation method"  must also be used.  Here,  the transmitter emits test signals at regular intervals,  measures the received signal and determines the echo impulse response from it.

			*In normal operation,  the echo canceller calculates the expected echo of its own transmitter depending on the message and subtracts this from the received signal in a transversal filter whose coefficients are set and re-adjusted by a powerful processor.




	''Note:''
			Note:

	*The exercise belongs to the chapter  [[Examples_of_Communication_Systems/ISDN_Basic_Access\|"ISDN Basic Access"]].		*The exercise belongs to the chapter  [[Examples_of_Communication_Systems/ISDN_Basic_Access\|"ISDN Basic Access"]].
	*In particular, reference is made to the section  [[Examples_of_Communication_Systems/ISDN_Basic_Access#Directional_separation_method\|"Directional separation method"]].
			*In particular,  reference is made to the section  [[Examples_of_Communication_Systems/ISDN_Basic_Access#Directional_separation_method\|"Directional separation method"]].


Line 37:		Line 39:
	{Is the ISDN system shown a		{Is the ISDN system shown a
	\|type="()"}		\|type="()"}
	+ Basic Rate Interface  (BRI),		+ Basic Rate Interface  $\rm (BRI)$,
	- Primary Rate Interface  (PRI)?		- Primary Rate Interface  $\rm (PRI)$?

	{What are the characteristics of the  $\rm U_{\rm K0}$ interface?		{What are the characteristics of the  $\rm U_{\rm K0}$ interface?
Line 44:		Line 46:
	+ It is realized by one copper twin pair.		+ It is realized by one copper twin pair.
	- It is realized by two copper twisted pairs.		- It is realized by two copper twisted pairs.
	- It is a fiber optic connection.		- It is a fiber-optic connection.

	{What are the properties of the  $\rm S_{0}$ interface?		{What are the properties of the  $\rm S_{0}$ interface?
Line 50:		Line 52:
	- It is realized by one copper twin pair		- It is realized by one copper twin pair
	+ It is realized by two copper twisted pairs.		+ It is realized by two copper twisted pairs.
	- It is a fiber optic connection.		- It is a fiber-optic connection.

	{Which statements are valid regarding directional separation methods?		{Which statements are valid regarding directional separation methods?
Line 56:		Line 58:
	+ They are part of the  $\rm U_{\rm K0}$ interface.		+ They are part of the  $\rm U_{\rm K0}$ interface.
	- They are part of the  $\rm S_{0}$ interface.		- They are part of the  $\rm S_{0}$ interface.
	+ A fork circuit can be found in every NTBA.		+ A fork circuit can be found in every  $\rm NTBA$.

	{Which statements are valid regarding the connection options to the  $\rm S_{0}$ bus?		{Which statements are valid regarding the connection options to the  $\rm S_{0}$ bus?

Hwang at 14:04, 9 October 2022

2022-10-09T14:04:38Z

Show changes

Guenter at 12:36, 10 September 2022

2022-09-10T12:36:39Z

← Older revision		Revision as of 14:36, 10 September 2022
Line 105:		Line 105:


	[[Category:Examples of Communication Systems: Exercises\|^1.2 ISDN~~-Basisanschluss~~^]]		[[Category:Examples of Communication Systems: Exercises\|^1.2 ISDN Basic Access^]]

Guenter: Guenter moved page Aufgaben:Aufgabe 1.3Z: Bussystem und Schnittstellen von ISDN to Aufgaben:Exercise 1.3Z: ISDN Bus System and Interfaces

2022-09-09T15:23:12Z

Guenter moved page Aufgaben:Aufgabe 1.3Z: Bussystem und Schnittstellen von ISDN to Aufgaben:Exercise 1.3Z: ISDN Bus System and Interfaces

← Older revision		Revision as of 17:23, 9 September 2022
(No difference)

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

2021-03-23T12:50:31Z

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

← Older revision		Revision as of 14:50, 23 March 2021
Line 105:		Line 105:


	[[Category:~~Aufgaben zu Beispiele von Nachrichtensystemen~~\|^1.2 ISDN-Basisanschluss^]]		[[Category:Examples of Communication Systems: Exercises\|^1.2 ISDN-Basisanschluss^]]

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

2020-07-09T12:48:36Z

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

← Older revision		Revision as of 14:48, 9 July 2020
Line 26:		Line 26:
	''Hinweis:''		''Hinweis:''

	*Die Aufgabe gehört zum Kapitel  [[~~Beispiele_von_Nachrichtensystemen~~/ISDN-Basisanschluss\|ISDN-Basisanschluss]].		*Die Aufgabe gehört zum Kapitel  [[Examples_of_Communication_Systems/ISDN-Basisanschluss\|ISDN-Basisanschluss]].
	* Insbesondere wird Bezug genommen auf die Seite  [[~~Beispiele_von_Nachrichtensystemen~~/ISDN-Basisanschluss#Richtungstrennungsverfahren\|Richtungstrennungsverfahren]]		* Insbesondere wird Bezug genommen auf die Seite  [[Examples_of_Communication_Systems/ISDN-Basisanschluss#Richtungstrennungsverfahren\|Richtungstrennungsverfahren]]


Line 77:		Line 77:
	'''(2)'''  Richtig ist <u>die Antwort 1</u>:		'''(2)'''  Richtig ist <u>die Antwort 1</u>:
	*Jeder NTBA ist durch ein Adernpaar mit der Ortsvermittlungsstelle verbunden. Die Kennung „K” in $\rm U_{\rm K0}$ weist dabei auf eine Kupferleitung hin.		*Jeder NTBA ist durch ein Adernpaar mit der Ortsvermittlungsstelle verbunden. Die Kennung „K” in $\rm U_{\rm K0}$ weist dabei auf eine Kupferleitung hin.
	*Lediglich bei einem [[~~Beispiele_von_Nachrichtensystemen~~/ISDN–Primärmultiplexanschluss\|Primärmultiplexanschluss]] mit 30 B–Kanälen, einem D–Kanal und einem Synchronisationskanal ist eine Anbindung über Glasfaser möglich.		*Lediglich bei einem [[Examples_of_Communication_Systems/ISDN–Primärmultiplexanschluss\|Primärmultiplexanschluss]] mit 30 B–Kanälen, einem D–Kanal und einem Synchronisationskanal ist eine Anbindung über Glasfaser möglich.
	*Aber auch hierfür werden meist Kupferleitungen verwendet.		*Aber auch hierfür werden meist Kupferleitungen verwendet.