WO2000005917A1 - Method for switching data received via a packet oriented data transmission path - Google Patents
Method for switching data received via a packet oriented data transmission path Download PDFInfo
- Publication number
- WO2000005917A1 WO2000005917A1 PCT/DE1999/001946 DE9901946W WO0005917A1 WO 2000005917 A1 WO2000005917 A1 WO 2000005917A1 DE 9901946 W DE9901946 W DE 9901946W WO 0005917 A1 WO0005917 A1 WO 0005917A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data
- oriented
- atm
- time slot
- channel
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- 239000011159 matrix material Substances 0.000 claims abstract description 21
- 230000011664 signaling Effects 0.000 claims description 16
- 230000006978 adaptation Effects 0.000 claims description 11
- 230000000737 periodic effect Effects 0.000 claims 1
- 238000004891 communication Methods 0.000 description 34
- 239000000945 filler Substances 0.000 description 12
- 230000002457 bidirectional effect Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
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
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0003—Switching fabrics, e.g. transport network, control network
- H04J2203/0005—Switching elements
-
- 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
- H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
- H04L2012/5652—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
- H04L2012/5653—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL]
- H04L2012/5656—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL] using the AAL2
-
- 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
- H04L2012/5672—Multiplexing, e.g. coding, scrambling
- H04L2012/5675—Timeslot assignment, e.g. TDMA
Definitions
- a known data transmission method for high transmission bit rates is the so-called Asynchronous Transfer Mode (ATM).
- ATM Asynchronous Transfer Mode
- ATM cells In the transmission technology known as asynchronous transfer mode (ATM), data packets of fixed length, so-called ATM cells, are used for the data transport.
- An ATM cell is composed of a five-byte long cell header containing the switching data relevant for the transport of an ATM cell, the so-called ⁇ header, and a 48-byte user data field, the so-called x payload.
- ⁇ header a five-byte long cell header containing the switching data relevant for the transport of an ATM cell
- x payload the so-called x payload.
- ⁇ Virtual Channel 'VC or ATM channel - In this case, in the user data field of an ATM cell, only one logical connection - often referred to in the literature as ⁇ Virtual Channel 'VC or ATM channel - is transmitted.
- An essential advantage of the method according to the invention is that switching of data assigned to different logical connections and transmitted in one or more data cells can take place via a conventional time slot-oriented switching matrix module. It is therefore not necessary to develop a switching matrix module designed for the present packet-oriented data format and to coordinate the signaling with it.
- An advantage of embodiments of the invention defined in the subclaims is, inter alia, that by inserting filler cells or filler data into a substructure element when converting a packet-oriented data format into a time slot-oriented data format, compressed data is transmitted without previous decompression is possible. This prevents a loss of quality when transmitting compressed data.
- An embodiment of the invention is explained below with reference to the drawing.
- 1 a structural diagram for the schematic representation of the essential functional units involved in the method according to the invention
- 2 a structural diagram for the schematic representation of the conversion of a packet-oriented data format into a time slot-oriented data format according to a first operating mode of a conversion unit
- 3 a structural diagram for the schematic representation of the conversion of the packet-oriented data format into the time slot-oriented data format according to a second operating mode of the conversion unit.
- Fig. 1 shows a schematic representation of a communication system PBX.
- the PBX communication system has subscriber or network connection modules - an ABG connection module is shown as an example - for connecting communication terminals or for a connection to a communication network - for example an ISDN-oriented communication network, an analog communication network, a radio Communication network or an ATM-based communication network - on.
- the communication system PBX contains a time slot-oriented switching matrix module KN having a plurality of bidirectional, time-division-oriented coupling connections KA, the time-division-oriented switching connections KA as PCM connections (pulse code modulation) - also as PCM- Highways, Speech-Highways or S 2M connections called - are designed.
- a PCM highway generally comprises 32 user channels in a communication system-internal data transmission, which are ISDN-oriented B channels (Integrated Services Digital Network) having a transmission ⁇ bitrate of 64 kbit / s are designed.
- connection unit AE and a conversion unit UE are arranged on the connection module ABG.
- the communication system PBX Via a network connection NA of the connection unit AE, the communication system PBX is connected to an ATM-based communication network ATM-KN consisting of several communication systems connected to one another.
- a first and a second communication terminal KE-A, KE-B are connected to the ATM-based communication network ATM-KN.
- the connection unit AE is connected to a bidirectional, package-oriented connection SK of the conversion unit UE via a bidirectional, packet-oriented connection SK.
- the conversion unit UE is also connected to a coupling connection KA of the time slot-oriented switching matrix module KN via a bidirectional, time-division-oriented coupling connection KA.
- the time slot-oriented switching matrix module KN is each connected to a bidirectional, time-division multiplex-oriented connection SK of further subscribers or network connection modules (not shown) arranged in the communication system PBX via further coupling connections KA (not shown).
- the conversion unit UE performs a bidirectional conversion between the packet-oriented data format of a connection line PO-VL between the conversion unit UE and the connection unit AE and the time slot-oriented data format of a connection line ZO-VL between the conversion unit UE and the time slot-oriented switching matrix module KN according to two different operating modes of the conversion unit UE, which are described in more detail below.
- a control unit STE having a plurality of control connections S1, S2 is provided in the communication system PBX. arranges.
- the control unit STE is connected to a control input SE of the time slot-oriented switching matrix module KN via a control connection S2 and to a control input SE of the connection module ABG via a control connection S1.
- - Control connections (not shown), the control unit STE is connected to control inputs of further subscriber or network connection modules arranged in the communication system PBX. Signaling information is transmitted between the control unit STE and the time slot-oriented switching matrix module KN or the connection module ABG in accordance with the HDLC data format (High Level Data Link Control).
- FIG. 2 shows a schematic representation of a conversion of the packet-oriented ATM data format in accordance with the ATM adaptation layer AAL type 2 (ATM adaptation layer) into the time slot-oriented data format in accordance with the TDM method (time division Multiplex) according to a first operating mode of the conversion unit UE.
- ATM adaptation layer ATM adaptation layer
- TDM method time division Multiplex
- An ATM cell ATM-Zl, ATM-Z2 is composed of a cell header H which contains the switching data relevant for the transport of an ATM cell ATM-Zl, ATM-Z2 and a 48-byte useful data field.
- ATM adaptation layer AAL adapts the ATM data format - often referred to in the literature as ⁇ ATM layer '(layer 2) - to the network layer (layer 3) according to the OSI reference model (Open Systems Interconnection).
- a substructure element SE according to the ATM adaptation layer AAL type 2 is composed of a 3-byte cell header and an nem user data area I of variable length (0 to 64 bytes) together.
- the cell header of a substructure element SE is subdivided into an 8-bit channel identification CID (Channel Identifier), a 6-bit length identification LI (Length Indicator), and a 5-bit transmitter-receiver identification UUI (User-to -User indication) and a 5 bit long cell header checksum HEC (Header Error Control).
- VPI value Virtual Path I_dentifer
- VCI value Virtual Channel Id.entifer
- each substructure element SE of an ATM cell ATM-Zl defined for the transmission of user data is ATM-Z2 a TDM channel
- K0, ..., K3 assigned to the time slot-oriented data format according to the TDM method.
- An assignment of a substructure element SE to a TDM channel K0, ..., K3 takes place in a signaling phase preceding the user data transmission.
- the substructure element SE received via the packet-oriented connecting line PO-VL and packaged in ATM cells ATM-Zl, ATM-Z2 are unpacked in the conversion unit UE.
- so-called filler cells FZ are converted to the ones containing the useful data for the conversion of the - possibly variable - transmission bit rate resulting from the size and arrival of the substructure elements SE to the constant transmission bit rate of 64 kbit / s of the time slot-oriented data format
- Substructure elements SE added adds.
- the length of a fill cell FZ is determined by a so-called fill cell header FZH.
- the length of a fill cell FZ is chosen so that the total transmission bit rate of a substructure element SE and a fill cell FZ results in an integer multiple of 64 kbit / s. If the transmission bit rate of a substructure element SE is greater than 64 kbit / s - that is, greater than the transmission bit rate of a TDM channel K1, ..., K4 - the user data transmitted in a substructure element SE are transferred to several TDM channels K1,. .., K4 divided.
- these data are assigned to a TDM channel K0, ..., K1 agreed in the signaling phase of the time slot-oriented connecting line ZO-VL and transmitted via this to the time slot-oriented switching matrix module KN.
- the signaling information transmitted in the signaling phase from the conversion unit UE to the control unit STE of the communication system PBX is converted in the control unit STE into switching-related control data for the time slot-oriented switching matrix module KN.
- the data received via the respective TDM channels K0, ..., K3 of the time slot-oriented connecting line ZO-VL (substructure elements SE and filling cells FZ together) are transmitted in the time slot-oriented switching matrix module KN, i.e. an assignment of a TDM channel of an input line of the time slot-oriented switching matrix module KN to a TDM channel of an output line of the time slot-oriented switching matrix module KN.
- the data (substructure elements SE and fill cells FZ together) are transmitted from the time slot-oriented switching matrix module KN to the conversion unit UE in which the filler cells FZ are removed from the TDM data stream, so that the data stream only has substructure elements SE containing useful data.
- the substructure elements SE to be transmitted are packaged in the conversion unit UE in ATM cells ATM-Zl, ATM-Z2 and transmitted to the addressed receiver via the ATM-based communication network ATM-KN. If the data is to be transmitted, for example, to an internal communication terminal (not shown), it is transmitted directly to a subscriber line module (not shown) via which the addressed communication terminal is connected to the PBX communication system.
- FIG 3 shows a schematic illustration of a conversion of the packet-oriented ATM data format according to the ATM adaptation layer AAL type 2 (ATM adaptation layer) into the time slot-oriented data format according to the TDM method (Time Division Multiplex) according to one second operating mode of the conversion unit UE.
- ATM adaptation layer AAL type 2
- TDM method Time Division Multiplex
- the - possibly variable - transmission bit rate of the packet-oriented data format is adapted to the constant transmission bit rate of 64 kbit / s of the time slot-oriented data format by filling the substructure elements SE with filler data FD, so that the total transmission bit rate of a substructure element SE (user data and filler data FD together) results in an integer multiple of 64 kbit / s.
- each TDM channel K0, ..., K3 is additionally assigned information about the length of the transmitted substructure element SE and supplemented with filler data FD in such a way that this information separates the useful data to be transmitted from the filler data FD is enabled.
- the first communication terminal KE-A sends in the context of a signaling phase preceding the user data transmission via a defined substructure element SE of a first ATM channel VA - in the literature often abbreviated to VC (Virtual Channel) - the necessary signaling information to the PBX communication system.
- the transmitted signaling information is unpacked in the conversion unit UE, converted into the HDLC data format and transmitted to the control unit STE.
- the substructure elements SE of the first ATM channel VA defined for the transmission of the user data from the first communication terminal KE-A to the communication system PBX becomes a TDM channel - for example the TDM channel 17 - of the time slot-oriented connecting line ZO-VL assigned.
- the transmitted signaling information is converted into switching control data for the time slot-oriented switching matrix module KN.
- the switching control data determines which input TDM channel - for example the TDM channel 17 of the time slot-oriented connection line ZO-VL - with which output TDM channel - for example the TDM channel 23 of the time slot-oriented connection line ZO- VL - the time slot-oriented switching matrix module KN is connected.
- the useful data to be transmitted are then packaged by the first communication terminal KE-A into substructure elements SE, which in turn are packaged in ATM cells ATM-Zl, ATM-Z2 and then transmitted to the communication system PBX via the first ATM channel VA .
- the substructure elements SE are unpacked from the ATM cells ATM-Zl, ATM-Z2 in the conversion unit UE.
- a next step for example, by inserting fill cells FZ according to the first operating mode of the conversion unit UE the size and the arrival of the substructure elements SE resulting transmission bit rate adapted to the constant transmission bit rate of 64 kbit / s.
- the data - consisting of substructure elements SE and filler cells FZ - are then forwarded via the TDM channel 17 of the time slot-oriented connecting line ZO-VL to the time slot-oriented switching matrix module KN.
- the time slot-oriented switching matrix module KN transmits the data to the TDM channel 23 of the time slot-oriented connecting line ZO-VL and sends it back to the conversion unit UE.
- the filler cells FZ are removed from the continuous data stream, so that the data stream only consists of substructure elements SE containing useful data.
- These substructure elements SE are then packaged in ATM cells ATM-Zl, ATM-Z2 and transmitted to the second communication terminal KE-B via a second ATM channel V-B.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002338293A CA2338293A1 (en) | 1998-07-22 | 1999-07-01 | Method for switching data received via a packet-oriented data transmission link |
EP99944231A EP1099358A1 (en) | 1998-07-22 | 1999-07-01 | Method for switching data received via a packet oriented data transmission path |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998132999 DE19832999C2 (en) | 1998-07-22 | 1998-07-22 | Method for switching data received via a packet-oriented data transmission link |
DE19832999.7 | 1998-07-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000005917A1 true WO2000005917A1 (en) | 2000-02-03 |
Family
ID=7874937
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1999/001946 WO2000005917A1 (en) | 1998-07-22 | 1999-07-01 | Method for switching data received via a packet oriented data transmission path |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1099358A1 (en) |
CA (1) | CA2338293A1 (en) |
DE (1) | DE19832999C2 (en) |
WO (1) | WO2000005917A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6898213B1 (en) | 2000-10-16 | 2005-05-24 | Iprad Ltd. | Circuit emulation service (CES) over IP |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10244980A1 (en) * | 2002-09-26 | 2004-04-15 | Siemens Ag | Method for communicating time-slot oriented information e.g. for ISDN communication network, requires communication time-slot oriented information from central communication unit to distributed communication unit |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0827305A1 (en) * | 1996-03-08 | 1998-03-04 | Ntt Mobile Communications Network Inc. | System and method for short-cell multiplex atm transmission |
US5784371A (en) * | 1995-01-13 | 1998-07-21 | Nec Corporation | ATM electronic exchange network system and electrode exchange equipment for use in the same |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19533507C2 (en) * | 1995-09-04 | 1997-10-02 | Hartmut Dipl Ing Neus | Multiplex, access and duplex methods for a cellular radio system |
DE19604245C2 (en) * | 1996-02-06 | 2000-07-06 | Siemens Ag | Method for transmitting time-division multiplex channel shape digital signals via an ATM transmission device |
GB9700930D0 (en) * | 1997-01-17 | 1997-03-05 | Northern Telecom Ltd | Distribution network |
DE19757598A1 (en) * | 1997-12-23 | 1999-07-08 | Siemens Ag | Data exchange method in ATM exchange |
DE19818776A1 (en) * | 1998-04-27 | 1999-11-04 | Siemens Ag | Method for connecting communication systems over a packet-oriented data transmission path |
-
1998
- 1998-07-22 DE DE1998132999 patent/DE19832999C2/en not_active Expired - Fee Related
-
1999
- 1999-07-01 WO PCT/DE1999/001946 patent/WO2000005917A1/en not_active Application Discontinuation
- 1999-07-01 CA CA002338293A patent/CA2338293A1/en not_active Abandoned
- 1999-07-01 EP EP99944231A patent/EP1099358A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5784371A (en) * | 1995-01-13 | 1998-07-21 | Nec Corporation | ATM electronic exchange network system and electrode exchange equipment for use in the same |
EP0827305A1 (en) * | 1996-03-08 | 1998-03-04 | Ntt Mobile Communications Network Inc. | System and method for short-cell multiplex atm transmission |
Non-Patent Citations (1)
Title |
---|
MAUGER R ET AL: "ATM ADAPTATION LAYER SWITCHING", ISS. WORLD TELECOMMUNICATIONS CONGRESS. (INTERNATIONAL SWITCHING SYMPOSIUM),CA,TORONTO, PINNACLE GROUP, pages 207-214, XP000720525 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6898213B1 (en) | 2000-10-16 | 2005-05-24 | Iprad Ltd. | Circuit emulation service (CES) over IP |
Also Published As
Publication number | Publication date |
---|---|
DE19832999C2 (en) | 2001-10-11 |
EP1099358A1 (en) | 2001-05-16 |
DE19832999A1 (en) | 2000-01-27 |
CA2338293A1 (en) | 2000-02-03 |
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