EP1374629A1 - Procede de transmission d'informations, et unite de transition de reseaux associees - Google Patents

Procede de transmission d'informations, et unite de transition de reseaux associees

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Publication number
EP1374629A1
EP1374629A1 EP02732555A EP02732555A EP1374629A1 EP 1374629 A1 EP1374629 A1 EP 1374629A1 EP 02732555 A EP02732555 A EP 02732555A EP 02732555 A EP02732555 A EP 02732555A EP 1374629 A1 EP1374629 A1 EP 1374629A1
Authority
EP
European Patent Office
Prior art keywords
iwf
gateway unit
customer
exchange
bit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02732555A
Other languages
German (de)
English (en)
Inventor
Frederick Wunderlich
Wieland Roeser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks GmbH and Co KG
Original Assignee
Siemens AG
Nokia Siemens Networks GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Nokia Siemens Networks GmbH and Co KG filed Critical Siemens AG
Priority to EP02732555A priority Critical patent/EP1374629A1/fr
Publication of EP1374629A1 publication Critical patent/EP1374629A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0435—Details
    • H04Q11/045—Selection or connection testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0435—Details
    • H04Q11/0464—Primary rate access circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5625—Operations, administration and maintenance [OAM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5663—Support of N-ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13039—Asymmetrical two-way transmission, e.g. ADSL, HDSL
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1316—Service observation, testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13174—Data transmission, file transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13196—Connection circuit/link/trunk/junction, bridge, router, gateway
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13202—Network termination [NT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13203—Exchange termination [ET]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13205—Primary rate access, PRI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13209—ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13215—Code checking, CRC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13216—Code signals, frame structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1329—Asynchronous transfer mode, ATM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13335—Simulation, emulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13349—Network management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13389—LAN, internet

Definitions

  • the invention relates to a method for transmitting information within at least one time-multiplex-oriented communication network via at least one packet-oriented communication network.
  • Functions for the operation and / or for the administration and / or for the maintenance are implemented in the time-multiplex-oriented communication network in order to transmit information within the time-multiplex-oriented communication network.
  • the information relates, for example, to user data or voice data.
  • the time division multiplex-oriented communication network is, for example, an ISDN data transmission network (Integrated Services Digital Network).
  • the data are transmitted in different time slots according to a time-division multiplex method.
  • the packet-oriented communication network is a network in which the information or the data are transmitted in data packets.
  • the packet-oriented communication network is, for example, a communication network operating in accordance with the Internet protocol.
  • Another example of a packet-oriented communication network is an ATM network (Asynchronous Transfer Mode), in which the data packets are referred to as cells.
  • ETSI ETS 300 233 Integrated Services Digital Network (ISDN); Access Digital Section for ISDN Primary Rate, May 1994,
  • ITU-T G.962 Digital Sections and Digital Line Systems; Access Digital Section for ISDN Primary Rate at 2048 kbit / s, 03/93, - ETSI ETS 300 011, Integrated Services Digital Network (ISDN); Primary Rate User-Network Interface Layer 1 Specification and Test Principles, April 1992.
  • the functions for operation, administration and maintenance relate to switching test loops or error monitoring, for example.
  • Associated gateway units should also be specified.
  • At least part of the information is transmitted via the packet-oriented communication network.
  • At least some of the functions for operation, administration and maintenance are emulated, ie simulated, by the packet-oriented communication network. This means that the time-multiplexed
  • the functions of the defined communication network continue to be used essentially without restrictions.
  • a customer-side gateway unit lies between a customer area and the packet-oriented communication network.
  • the customer's gateway unit is also referred to as CP-IWF (Customer Premises - Interworking Function).
  • the network gateway unit on the exchange side is also referred to as CO-IWF (Central Office - Interworking Function).
  • CO-IWF Central Office - Interworking Function
  • the emulation is provided by functions of the packet-oriented communication network, in particular by the customer-side gateway unit and by the switching center-side gateway unit.
  • ATM network an ATM network that is implemented according to the asynchronous transmission mode (ATM).
  • ATM asynchronous transmission mode
  • AAL1 Asymmetrical Digital Subscriber Line
  • AAL2 AMAC adaptation layer
  • the AAL2 layer in particular is well suited for reducing the bandwidth during transmission in the packet-oriented communication network, in particular when connecting subscribers.
  • XDSL X-Digital Subscriber Line
  • ADSL Asymmetrical Digital Subscriber Line
  • SDSL Symmetrical Digital Subscriber Line
  • the packet-oriented communication network is implemented in accordance with the Internet protocol.
  • IP can be used via ATM transmission methods.
  • the time-multiplex-oriented communication network is an ISDN network.
  • the following standards relating to the ISDN network are of particular importance:
  • P ⁇ P ⁇ P J rt POP cn P. f-3 N rt cn rt ⁇ pr rt cn ß ⁇ cn M P. ⁇ P er P ⁇ -i P ⁇ Q ⁇ O ⁇ ⁇ - ⁇ s: ⁇ -i P J ⁇ - • PX cn ö SI X C ⁇
  • the invention also relates to a customer-side network gateway unit and a switching center-side network gateway unit, each of which contains functional units, during the operation of which the method steps relating to the customer-side network gateway unit or to the switching center-side network gateway unit are carried out according to the inventive method or one of its developments. This means that the technical effects mentioned above also apply to the two network gateway units.
  • 1 shows an ISDN primary multiplex interface model with a processing of a time slot according to TSO
  • FIG. 2 shows a CRC-4 multi-time frame structure
  • FIG. 3 functional units and functional sequences for switching a test loop in a switching center CO-IWF on the exchange side
  • Gateway unit CP-IWF Gateway unit CP-IWF
  • VCC 5 shows the monitoring of an ATM network by VCC
  • FIG. 6 shows the monitoring of the ATM network by VCC performance monitoring and continuity monitoring an ATMup interface of the exchange-side network gateway unit CO-IWF,
  • FIG. 7 functional sequences when a CRC-4 error (Cyclic Redundancy Check) is reported by a customer facility TE,
  • FIG. 8 functional sequences when detecting a CRC-4 error in a tup signal from the customer's network transition unit CP-IWF
  • FIG. 9 functional sequences when a CRC-4 error is reported by the customer facility TE and, at the same time, a CRC-4 error is detected in the tup signal of the customer's network transition unit CP-IWF,
  • FIG. 10 functional sequences when detecting a loss of signal (LOS - Loss of Signal) or when detecting a loss of frame alignment or frame synchronization (LFA - Loss of Frame Alignment) on the
  • FIG. 11 functional sequences when detecting an ATM connection error at the ATMdown interface on the customer's network transition unit CP-IWF,
  • FIG. 12 functional sequences when an ATM connection error occurs at the ATMdown interface due to a signal loss (LOS) at the exchange-side network gateway unit CO-IWF,
  • LOS signal loss
  • FIG. 13 functional sequences when a signal loss (LOS) or a loss of frame alignment (LFA) occurs at the T reference point of the customer
  • FIG. 14 functional sequences when an ATM connection error of the ATMup signal occurs at the exchange-side network transition unit CO-IWF,
  • FIG. 15 functional sequences when acquiring an AIS (alarm indication signal) on the customer's network transition unit CP-IWF,
  • FIG. 16 functional sequences when acquiring an AIS in the
  • FIG. 17 functional sequences when detecting an operating voltage failure in the customer's network transition unit CP-IWF
  • FIG. 18 the reference model for the service for emulating a subscriber line using AAL2,
  • FIG. 19 shows a protocol reference model for a customer-specific network transition unit CP-IWF with a user-side ISDN PRI and with a DSSI relay (Digital Signaling System Number One) via the
  • FIG. 20 shows a protocol reference model for a switching center-side network transition unit CO-IWF with a user-side ISDN PRI and with a DSS1-
  • ATM Adaptation Layer 2 / Loop Emulation Service ATM Adaptation Layer 2 / Loop Emulation Service
  • a text is proposed for supplementing the service for emulating a subscriber access line (LES - Loop Emulation Service) using the AAL2, starting from the af-vmoa-0145.000 standard, the ISDN primary multiplex interface (PRI - primary rate
  • AAL2 AAL2 trunking
  • EOC embedded operation channel
  • CID channel identifier
  • ELCP Emulated Loop Control Protocol
  • ISDN PRI overview An overview of the use of the ISDN primary multiplex interface in the world of classic time division multiplex (TDM - Time Division Multiplex) is given below. It also specifies requirements that must be met if parts of the digital access section (DS - access digital section) of the primary multiplex connection are replaced by the ATM network. Procedures are also specified that meet these requirements.
  • FIG. 1 shows a digital connection section DS (access digital section) with its limitations and the processing of the time slot TS0.
  • the operating and maintenance functions support methods and information elements that are required to control the digital connection section by an exchange ET or a service network node (service node).
  • a Sa5, a Sa6, an E and an A bit of a time slot TS0 are relevant for display and control.
  • the bit structure of the time slot TS0 and the multi-time frame structure are defined in accordance with the ITU-T G.704 standard and are explained in more detail below with reference to FIG. 2.
  • the A bit is used for alarm status information between the service network node and a customer telephone device TE (customer telephony end equipment). Only the A bit has to be monitored and is transmitted transparently. All other control bits of the time Slotted TSO must be transmitted transparently.
  • FIG. 1 shows the elements of the digital connection section DS that use CRC methods 4, 6 (Cyclic Redundancy Check).
  • the CRC-4 processes 4, 6 are implemented and used between the switching center ET and the network termination unit NT1 and between the network termination unit NTl and the customer telephone device TE. This is also option two according to the ITU-T G standard. 962 known.
  • Figure 1 also shows a line termination unit LT.
  • a V3 reference point lies between the line termination unit LT and the exchange ET.
  • a T reference point lies between the customer telephone device TE and the network termination unit NT1.
  • Normal time frames These are time frames without error displays or test loop requests generated by the switching center ET or the customer telephone device TE, an A bit with the value one or zero not being relevant for the digital connection section DS.
  • Time frames These are time frames which, in addition to the normal time frames in the Sa6 bits, contain error display signals which have been generated in the network termination unit NT1 and have been transmitted to the switching center ET.
  • the Sa ⁇ bits can contain test loop requests that have been transmitted from the switching center ET to the digital connection section DS.
  • the Sa5 bit is also used to indicate the direction and to display the test loop.
  • the Sa5 bit in the transmission direction from the digital connection section DS to the exchange ET is set in the network termination unit NT1 or in the line termination unit LT and transmitted to the exchange ET according to the following rules:
  • FIG. 2 shows the structure of a CRC-4 multi-time frame.
  • the CRC-4 multi-time frame consists of two sub-multi-time frames I and II. Each sub-multi-time frame I, II consists of eight time frames.
  • the CRC-4 checksum is calculated for all bits of a sub-multi-time frame I, II.
  • the CRC bits CI, C2, C3 and C4 are transmitted in bit one of the frame alignment signal.
  • the frame alignment signal is transmitted in even-numbered time frames (0, 2, 4, ).
  • the Sa bits are part of the signal that does not concern the frame alignment.
  • the Sa bits and the A bit are transmitted in the odd-numbered time frame (1, 3, 5, ).
  • the first bit of the odd time frames 1, 3, 5, 7, 9 and 11 forms the CRC multi-time alignment signal, which has the form of a bit sequence with the value "001011".
  • Bit one in the thirteenth time frame is the so-called E bit and is used to indicate the receipt of a faulty sub-multi-time frame by setting the E bit from value one to zero for each faulty sub-multi-time frame I.
  • the first bit in the fifteenth time frame serves to display an error for each faulty sub-multi-time frame II.
  • the CRC procedure is used to protect against defective frames (framing) and error performance monitoring. This includes the multi-time frame procedures that are defined in the ITU-T G.704 standard.
  • ATM methods are used for this purpose in the exemplary embodiments, although these methods do not offer the same options as CRC monitoring.
  • the VCC Virtual Channel Connection
  • Performance Monitoring Performance Monitoring
  • the continuous continuity check For monitoring between the network transition unit NT1 and the line termination unit LT, the VCC (Virtual Channel Connection) performance monitoring (Pmo - Performance Monitoring) and the continuous continuity check can be used.
  • the line termination unit LT a calculation according to the CRC-4 error monitoring method in the transmission direction to the exchange ET is carried out again. No changes are required for the CRC-4 method between the network termination unit NT1 and the customer telephone device TE.
  • the methods explained below permit the emulation of an operating and maintenance method for a primary multiplex interface (PRI OAM - Primary Rate Interface Operation Administration Maintenance) via an interface with the service emulation of a subscriber line (LES interface - Loop Emulation Service Interface).
  • PRI OAM Primary Rate Interface Operation Administration Maintenance
  • the digital connection section DS provides the means for transmitting display elements and for detecting faults at the T reference point interface and at the V3 reference point interface and to support test procedures.
  • Test loop 1 (loopback), transparent test loop in the line termination unit LT or in the switching center CO-IWF (FI),
  • Test loop 2 transparent test loop in the network termination unit NTl or in the customer's network transition unit CP-IWF (F2), errors - within the digital connection section DS
  • Loss of signal (LOS) or loss of frame alignment (LFA) on the line side of the Network termination unit NTl or the customer's network transition function CP-IWF in the signal coming to the network termination unit NTl or to the customer's network transition unit CP-IWF from the line termination unit LT or the switching center-side network transition unit CO-IWF, also called a downstream signal) ( F9), signal loss (LOS) on the line side of the line termination unit LT or the exchange-side network transition unit CO-IWF
  • LOS Loss of signal
  • LFA loss of frame alignment
  • 3 to 17 each show a table in the upper part, in the top row of which the columns of a table header are assigned to the following elements in the following order:
  • Switching node a service node (switching node).
  • Lines 2 and 3 of the table header relate to the assignment of the columns in the transmission direction from the customer telephone device TE to the exchange ET. For this direction of transmission:
  • Tup, Tup, ATMup, ATMup, V3up and V3up interfaces are also referred to as Tup, Tup, ATMup, ATMup, V3up and V3up interfaces.
  • Lines 2 and 3 of the table header are assigned to the first line of the table body.
  • Lines 4 and 5 of the table header relate to the transmission of data in the transmission direction from the exchange ET to the customer telephone device TE.
  • This direction of transmission :
  • the first column of the table contains the data received in the customer telephone device TE, which come from the customer's network gateway unit CP-IWF,
  • column 3 the data which are sent from the customer's network transition unit CP-IWF to the customer telephone device TE,
  • FIG. 3 shows functional units and functional sequences for switching a test loop in the exchange-side network gateway unit CO-IWF.
  • the switching center CO-IWF sends the ISDN PRI signal back to the switching center ET.
  • the A bit is set to the value one in the direction of transmission to the customer's gateway unit CP-IWF.
  • the A bit is set to the value one and the Sa5 bit to the value zero.
  • function FI The function explained with reference to FIG. 3 is also referred to as function FI.
  • FIG. 4 shows functional units and functional sequences for switching a test loop in the customer's gateway unit CP-IWF.
  • the test loop in the customer's network transition unit CP-IWF is created by inserting end-to-end F5 test loop cells, which are also referred to as F5 LB cells (loopback). These cells are inserted by the exchange-side network gateway unit CO-IWF after the test loop command relating to the network termination unit NT or the customer-side network gateway unit CP-IWF has been issued.
  • a local test loop is set up in the exchange-side network gateway unit CO-IWF, which is similar to the test loop in the case explained with reference to FIG.
  • test loop in the line termination unit LT or the exchange-side network gateway unit CO-IWF.
  • the test loop is considered faulty if the LB cells do not return to their starting point within five seconds.
  • the switching center CO-IWF manipulates the switch sent to the switching center ET.
  • P P P Q> P IM ⁇ O ⁇ rt 3 P rt P ⁇ P ⁇ ⁇ o P P P ⁇
  • FIG. 5 shows the case in which a faulty block of user cells due to the received FPM cells or a loss of continuity (LOC - loss of continuity) due to the VCC continuity monitoring has been detected.
  • FIG. 6 shows the monitoring of the ATM network 10 by the VCC performance monitoring and by the continuity monitoring at the ATMup interface of the exchange-side network gateway unit CO-IWF. The sequences are shown when an error is detected in the ATM signal received by the exchange-side network transition unit CO-IWF.
  • VCC continuity monitoring is carried out in accordance with the ITU-T 1.610 standard.
  • the various functions specified in the ITU-T 1.610 standard the following are used.
  • CC Continuity check
  • the VC-CC cells are sent repeatedly with a periodicity of nominally one cell per second regardless of the number of user cells transmitted, - A loss of continuity (LOC) is determined if the VCC receiver (sink point) receives no user cell or no continuity monitoring cell within a time interval of 3.5 seconds with a margin of 0.5 seconds.
  • LOC loss of continuity
  • VCC performance monitoring is also carried out in accordance with the ITU-T 1.610 standard, whereby the following options of the ITU-T 1.610 standard are used:
  • the performance monitoring is activated during the connection establishment, only the forward monitoring is supported, the block size N, after which an FPM cell is inserted, is outside the control range of the document, i.e. is a configurable parameter.
  • function F3 The function explained with reference to FIG. 5 is also referred to as function F3.
  • function F4 The function explained with reference to FIG. 6 is also called function F4.
  • a second CRC-4 section is monitored between the customer-side gateway unit CP-IWF and the customer telephone device TE.
  • FIG. 7 shows the functional sequences when a CRC-4 error is reported by the customer telephone device TE.
  • the function explained in FIG. 7 is also referred to as function F5.
  • FIG. 8 shows functional sequences when detecting a CRC-4 error in the tup signal of the customer's network transition unit CP-IWF. It is the task of the customer's CP-IWF gateway unit to record CRC-4 errors and to report them to the switching center ET. The associated bit sequences are shown in the table in FIG. The function shown in FIG. 8 is also referred to as function F6.
  • FIG. 9 shows functional sequences when a CRC-4 error is reported by the customer telephone device TE and, at the same time, a CRC-4 error is detected in the Tup signal of the customer's network transition unit CP-IWF.
  • function F8 The function explained with reference to FIG. 10 is also referred to as function F8.
  • FIG. 11 shows functional sequences when detecting an ATM Connection error at the customer's ATMdown interface side gateway unit CP-IWF.
  • An error in the signal coming from the ATM network 10 is detected in the customer's gateway unit CP-IWF due to the end-to-end VCC continuity monitoring, a cell loss, a loss of cell alignment or cell synchronization. or due to a physical connection error, in particular due to a signal loss (LOS - Loss of signal) at the XDSL level (X-Digital Subscriber Line).
  • the exchange-side gateway unit CO-IWF starts the VCC Continuity Check after the VCC has been set up.
  • VCC continuity monitoring is carried out in accordance with the ITU 1.610 standard. From the various options of the The following options are used in standards 1.610:
  • Continuity monitoring is activated during the connection establishment, the VC-CC cells are sent repeatedly with a
  • H p- p P P P o p: pr Pd iQ ⁇ o P H ⁇ h P rt ⁇ - pr rt ⁇ - H P 25 ⁇
  • Transition unit CP-IWF transmitted The function shown in FIG. 16 is also referred to as function F14.
  • Function 14 is based on an error case, which is a combination of two error cases which have been explained above using functions F8 and F13 and using FIGS. 10 and 15.
  • FIG. 17 shows functional sequences when detecting an operating voltage failure on the customer's network transition unit CP-IWF. If an operating voltage failure is detected by the customer's network transition unit CP-IWF, the bit values shown in the table in FIG. 17 are used. The function shown in FIG. 17 is also referred to as function F15.
  • a further exemplary embodiment is explained below in which an expanded basic text for the ATM standard afmoa-0145.000 is proposed. Starting from the exemplary embodiments already explained above, it is explained which text sections of the af-vmoa-0145.000 standard are to be replaced or supplemented. New sections are also given.
  • the gateway units are: in the customer area (CP-IWF with the user interface at the T reference point, defined in the ITU-T 1.411, 1.431 and ETSI ETS 300 011 standards), and in the service provider area (CO-IWF with the local exchange at the V3 reference point , defined in the ITU-T Q.512 standard).
  • virtual ATM connections via AAL2 for the transmission of user information (bearer information) and signaling is specified.
  • the virtual connections used should be PVC (Permanent Virtual Circu- it).
  • gateway units IWF The functionality of the gateway units IWF, the relevant aspects of the control level for the service for emulating a subscriber line using AAL2 (Loop Emulation Service Using AAL2), the relevant aspects of the user level for the service for emulating a subscriber line using AAL2, - relevant aspects the network management level.
  • AAL2 Loop Emulation Service Using AAL2
  • This specification serves to support the provision of ISDN PRI services for customer areas via bandwidth-limited ATM connections, such as that of DSL systems CO CO> IV) HH
  • alarm indications are transmitted in the AAL2 maintenance channel.
  • This specification determines the narrowband interfaces and specifies the ATM interfaces on the CP-IWF and the CO-IWF.
  • the IMFs may also have other interfaces for management and administration purposes, but these are not specified in this document.
  • an IWF (CP and CO) should support DSI or El connections (circuits) according to the ITU-T G.703 and G.704 standards, depending on the application.
  • the primary multiplex B channel structure is supported, ie independent B channels with 64 kbps.
  • the H channel structures are not supported (HO: 384 kbps (kilobit per second), Hll: 1536 kbps, H12: 1920 kbps). IWF user and network interfaces
  • a CP-IWF must support suitable interfaces for an ISDN PRI connection to a telephone system in the customer area.
  • the specifications for this interface include: a primary multiplex ISDN interface according to the ITU-T 1.431, ETSI ETS 300 011 or equivalent national specifications.
  • a CO-IWF must have suitable interfaces for ISDN PRI
  • an IWF should support one of the following signaling systems depending on the required application:
  • N-ISDN according to the ETSI version of DSS1, as defined in the standards ETSI ETS 300 125 and ETS ETSI 300 102-1.
  • ATM VCC to transmit AAL2 channels to support a PRI over a LES
  • An ATM VCC between a CP-IWF and a CO-IWF can contain traffic from exactly one ISDN primary multiplex interface.
  • DSSI signaling for ISDN PRI lines and the B channels of the narrowband interface are transmitted in the same ATM VCC in different AAL2 channels.
  • Time slot TSO contains the frame alignment signal or the non-frame alignment signal used to transmit the maintenance and alarm information.
  • the protocol reference model for a CP-IWF with ISDN PRI towards the user interface is shown in FIG. 19.
  • the transmission of media data streams (media streams) between CP-IWF and CO-IWF is the same as in analogue telephony, including the optional use of tone dialing (DTMF Dial Digit Service - Dual Tone Multiple Frequency).
  • DSSI signaling is not completed in the CP-IWF.
  • DSSI signaling messages are sent from the CP-IWF out of the narrowband D channel via the AAL2 VCC using the service for transmission / error detection
  • the SSCS (Service Specific Convergence Sublayer) specified in the ITU-T 1.366.2 standard is used in this channel with PCM64 coding and a change of the coding profile is not permitted because the information contained in the time slot TSO is to be transmitted transparently. Thus, no voice compression and no pause suppression should be used for this channel.
  • an application identifier must be defined for: the emulation service for a local loop using DSS1 to support PRI with ELCP (Emulated Loop Control Protocol).
  • the type of SSCS to be used on each channel of an AAL2 VCC depends on the use of that channel.
  • Channels used for the transmission of media data streams should use the SSCS defined in the ITU-T 1.366.2 standard.
  • the channels used to transmit the control and management level traffic (ELCP, DSS1 in the ISDN-D channels and LES-EOC) should use the SSCS defined in the ITU-T 1.366.1 standard.
  • the SSCS specified in the ITU-T 1.366.2 standard is intended to transmit additional error and alarm messages, such as those contained in the time slot TSO of the ISDN PRI application be used, but without speech compression and / or speech pause suppression, VAD (Voice Activity Detection) method.
  • VAD Voice Activity Detection
  • the CID with the value sixteen should be used for the transmission of the time slot TSO of the ISDN PRI signal. This CID is assigned during the system start-up, whereby the channel is activated at the same time.
  • the ISDN PRI consists of:
  • time slots numbered 1 to 15 and 17 to 31, for the transmission of the B channels, a signaling time slot with the number 16 for transporting the DSSI signaling, and - a time slot with the number 0 for the transmission of the time frame alignment, the signal for the CRC multi-time frame alignment, the CRC, and maintenance information in the case of an EL interface.
  • Each active B-channel, the signaling channel (DSSI signaling), the ELCP protocol and the one which relates to the frame alignment signal or that which is not related to the frame alignment Channels containing signals should be transmitted in a separate 7 ⁇ AL2 channel of the same VCC.
  • B channels are assigned to the AAL2 channels dynamically depending on the call state using the ELCP.
  • the AAL2 channels for the ELCP and the frame alignment signal and for the signal not related to the frame alignment are assigned statically.
  • the AAL2 channel is assigned dynamically by the CO-IWF using an ALLOCATION message, as in the case of the ISDN BRI.
  • the AAL2 channel is identified by the CID with the value sixteen for the signal relating to the frame alignment and for the signal not relating to the frame alignment (TSO).
  • the CO-IWF does not receive an explicit message about the assignment or release of a channel, as in the case of the LES and a V5 or a GR303 SNI. Therefore, the CO-IMF must be informed by other measures.
  • the proposed solution is that the CO-IWF determines the call state “idle” on the basis of the monitoring of the DSS1 messages in the time slot sixteen of the narrowband interface. Based on the messages for the call setup and for the release, the CO-IWF will occupy or release the required AAL2 channels, using ELCP.
  • the signaling information itself is transmitted transparently between the IWFs using the SSSAR (Service Specific Segmentation And Reassambly) and the SSTED (Service Specific Transmission Error Detection) method according to the standard afmoa-0145.000.
  • SSSAR Service Specific Segmentation And Reassambly
  • SSTED Service Specific Transmission Error Detection
  • Figure 20 shows the protocol reference model for the CO-IWF. ISDN-PRI specific OAM procedures and tables of alarm states
  • CP-IWF customer-side gateway unit Customer Premises Interworking Function
  • AIS Alarm Signal (Alarm Indication Signal) TSO analyze clock start time slot a t forward transparently

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention concerne un procédé dans lequel des fonctions sont établies pour permettre le fonctionnement, l'administration et l'entretien, initialement pour un réseau de communication par multiplexage temporel (12). Afin de permettre l'utilisation de ces fonctions même lors de la transmission dans un réseau de communication par paquets (10), lesdites fonctions sont émulées par ce réseau de communication (10).
EP02732555A 2001-04-04 2002-04-04 Procede de transmission d'informations, et unite de transition de reseaux associees Withdrawn EP1374629A1 (fr)

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EP01108481 2001-04-04
EP02732555A EP1374629A1 (fr) 2001-04-04 2002-04-04 Procede de transmission d'informations, et unite de transition de reseaux associees
PCT/EP2002/003753 WO2002082854A1 (fr) 2001-04-04 2002-04-04 Procede de transmission d'informations, et unite de transition de reseaux associees

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US20050041633A1 (en) 2005-02-24

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