WO1998015157A1 - Dispositif d'entrelacement de donnees et d'informations de signalisation - Google Patents

Dispositif d'entrelacement de donnees et d'informations de signalisation Download PDF

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Publication number
WO1998015157A1
WO1998015157A1 PCT/SE1997/001621 SE9701621W WO9815157A1 WO 1998015157 A1 WO1998015157 A1 WO 1998015157A1 SE 9701621 W SE9701621 W SE 9701621W WO 9815157 A1 WO9815157 A1 WO 9815157A1
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WO
WIPO (PCT)
Prior art keywords
information
signalling
data
channel
switching
Prior art date
Application number
PCT/SE1997/001621
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English (en)
Inventor
Leif Isaksson
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
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 Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to AU45786/97A priority Critical patent/AU721715B2/en
Priority to EP97944248A priority patent/EP1010347A1/fr
Publication of WO1998015157A1 publication Critical patent/WO1998015157A1/fr
Priority to NO991532A priority patent/NO991532L/no

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/12—Arrangements providing for calling or supervisory signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/07—Synchronising arrangements using pulse stuffing for systems with different or fluctuating information rates or bit rates
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13034—A/D conversion, code compression/expansion
    • 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
    • H04Q2213/13176—Common channel signaling, CCS7
    • 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
    • H04Q2213/13209—ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13216—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
    • H04Q2213/1322—PBX
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13292—Time division multiplexing, TDM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13296—Packet switching, X.25, frame relay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13367—Hierarchical multiplexing, add-drop multiplexing

Definitions

  • the present invention relates to switching of information at least in the form of data and signalling information in e.g. a communications network.
  • the signalling information for example relates to status information about connections, services and information about which channel is to be used for a given connection etc. Signalling is used both between subscriber equipment and exchange or switching arrangement and between different switching arrangements or exchanges.
  • the invention particularly relates to a switching arrangement for switching information at least in the form of data and signalling information and to a method for transferring at least data information and signalling information between at least a first network node and a second network node in a communications network.
  • the invention relates to a switching point in a communications network which comprises a private branch exchange.
  • Still further the invention relates to a communications network comprising at least a first and a second node between which data information and signalling information is transferred.
  • Signalling is among others used between various switching arrangements in a communications network, wherein the signalling information for example comprises information about A-number, B- number, services, communications channels to be used etc.
  • a common channel signalling channel is used, one example is for instance the so called D- channel in the integrated services digital network, ISDN.
  • PCM Pese Code Modulated
  • the D-channel is sent in time slot 16.
  • the D-channel is generally transported either as a 64 kbps channel, a 16 kbps channel or as a V.24 based data channel such as a modem or some other kind of data network.
  • a separate network which as such requires a considerable amount of equipment since it is separate from the data network and/or a network used for transportation of voice. If thus there are at least two networks, separate units for the separate networks are required as well as separate supervision, e.g. separate operation and maintenance systems etc. Furthermore such a system is not as flexible as would be desired.
  • the capacity of the channel used for signalling purposes is only used to a very limited extent, e.g. only to some per cent or a few per cents.
  • the bandwidth, which often is leased, in some cases involving high costs, specifically intended for signalling purposes is only used to very a limited extent.
  • a node requires one ERLANG with a holding time of 180 seconds per call, it will use the signalling link for 20 calls per hour which represents a very small fraction of the leased capacity which for example may be a full 64 kbps channel.
  • EP-A-0418851 relates to a control channel terminating interface for terminating the control channel signal at a digital multiplex transmission route. In this case information is spread over a several connections or a whole interface and not sent on a channel.
  • What is needed is therefore a switching arrangement at least for switching data and signalling information through which the channel used for signalling information, which e.g. may be leased or comprised in a public network such as ISDN or PSTN, is used in a more efficient manner than hitherto known.
  • An arrangement is also needed through which switching of data and signalling information can be effected using one and the same network.
  • an arrangement is needed which is flexible, easy to implement and which does not require much equipment as compared to hitherto known arrangements.
  • Furthermore an arrangement is needed which involve comparatively low maintenance costs.
  • Still further an arrangement is needed which enables a fast switching, particularly of signalling information.
  • a network switching node or a switching point m a telecommunications network comprising a private branch exchange is also needed through which the above mentioned can be achieved. Still further a communications network comprising at least two switching nodes, or private branch exchanges, is needed which fulfils the above mentioned requirements.
  • a method for switching at least data information and signalling information through a number of switching arrangements m a communications network is also needed through which the m the foregoing discussed objects can be satisfied.
  • a switching arrangement wherein a data resource is used for signalling information and which comprises signalling handling means for handling signalling information on a signalling channel and data accessing means for handling data to/from a number of interfaces.
  • Said data accessing means comprises means or additional access means for handling signalling information on a common channel signalling channel and means for replacing idle information or filler information on the common channel signalling channel by data information so that the bandwidth on the signalling channel not used for useful or real signalling information can be used for carrying data.
  • a network switching node comprising a private branch exchange which comprises a switching matrix, data access means for accessing data over a number of data interfaces and signalling handling means receiving and transmitting signalling information.
  • the data access means are arranged within the switching matrix of the private branch exchange and comprise means enabling the access of signalling information.
  • a data resource is thus used for signalling information and signalling information to/from the signalling handling means is transferred via the data access means and signalling to/from the switching point is performed over a line, e.g. a data relaying link and the bandwidth on the signalling channel that is not used for carrying signalling information is used for carrying data.
  • a data resource is used for transfer of both signalling information and ata. It is therefore possible to minimize the bandwidth of the signalling channel.
  • a communications network which comprises at least a first and a second switching node, between which nodes at least data information and signalling information is transferred.
  • Each switching node comprises a switching matrix m which are arranged data access means for data access and comprising means for the access of the signalling information.
  • Each switching node further comprises signalling handling means wherein the data access means and the signalling handling means within each switching node communicate via a signalling connection line.
  • the data access means further comprises means for replacing non-useful signalling information or filler information by data information so that the spare bandwidth on the signalling channel can be used for data information instead.
  • a data resource is used for transfer of both signalling information and data. It is therefore possible to minimize the bandwidth of the signalling channel.
  • a method for transferring at least data information and signalling information between at least a first network node and a second network node m a communications network.
  • the method comprises the steps of: examining m the data access means if received signalling information from the signalling handling means over a signalling channel contains non-valid or idle information, replacing such (if existing) non-valid or idle information through data information.
  • the data information and the valid signalling information is then advantageously packetized and sent over a link to the second network node. More particularly, in said second switching node the data information and the signalling information are separated and idle information may be added for sending to the signalling handling means whereafter the signalling information is output to the software of the second switching node which handles it m a known manner.
  • the data access means particularly comprises packet switching means or a frame relay switch.
  • the data information and the signalling information may then be switched via said (for instance) packet switching means on a data relaying link to another switching arrangement.
  • the data access means and the signalling information handling means communicate via a full-rate common channel signalling channel.
  • the signalling information, and possibly filler information is transported m a subrate e.g. (16 kbps) channel.
  • m this case some delay m the transmission of signalling information to the data access means from the signalling handling means will have to be accepted as compared to the full-rate case.
  • the means for replacing idle information such as for example filler bits through data information are also capable of generating idle information such as for example filler bits, when signalling information is transferred to the signalling handling means from the data access means.
  • idle information such as for example filler bits
  • a full-rate connection to the signalling handling means is upheld.
  • the common channel signalling channel is the ISDN D-channel.
  • the D-channel is transported as a 64 kbps channel.
  • the common channel signalling channel, or particularly the D-channel comprises idle information e.g. in the form of filler bits, these are removed in the data accessing means and replaced by data information and vice versa when receiving information from another switching arrangement.
  • filler bits in subrate channels can be replaced by data.
  • the data-link connection on which data information and signalling information is transported comprises an X.25 packet mode interface or a frame relay user interface.
  • the data accessing means of the switching arrangement provides access for almost any data interface such as for example V.24 (ITU-T), Ethernet, Token Ring (IEEE Standards) .
  • the switching arrangement also provides for switching of voice and even more particularly compressed voice can be switched without previously being decompressed, i.e. voice can be switched in a compressed format.
  • the switching arrangement then comprises signalling arranging means which at least comprises means for combining subrate channels transported in separate time slots in each of which only some of the bits are used for carrying information. Combined subrate channels are output on a full-rate transmission path or in subrate channels transported in a common time slot.
  • signal arranging means are advantageously compressed speech multiplexed or combined with the data and the signalling information.
  • the switching arrangement comprises compressing/ decompressing means for handling incoming/outgoing voice calls for which the switching arrangement forms an originating and/or a terminating arrangement.
  • the signalling arranging means advantageously comprise demultiplexing means for dividing a number of subrate channels transported in a common time slot containing compressed voice into a number of separate time slots for switching purposes. The subrate channels switched in separate time slots are combined with other subrate channels arranged in separate time slots also containing compressed voice and/or signalling information and/or data in said combining means before output.
  • the signal arranging means comprising compressing and multiplexing of voice are described in the Swedish patent application "Channel handling device, telecommunication node and telecommunication system comprising such a channel handling device as well as methods of transmitting signals", filed 01.10.96 with application number 9603590-2, i.e. on the same day and by the same applicant as the present application.
  • the link connecting the switching arrangement with a further switching arrangement comprises a leased line such as e.g. a single or multiple 64 kbps line(s).
  • the data accessing means are arranged in the switching matrix of a private branch exchange (PBX or PABX) .
  • the signalling information handling means are arranged on a common board including functionalities for compressing/decompressing voice information and/or for multiplexing/demultiplexing information in channels in a manner which will be more fully explained later on.
  • the network switching point or the switching node comprises means for particularly enabling the maintenance of a full-rate communication channel as discussed above, which provides for removing/adding idle information or filler bits from/to the common channel signalling channel.
  • the full-rate communication channel between the data access means and the signalling information handling means comprises a full-rate 64 kbps ISDN D-channel.
  • the network switching node may comprise means for switching compressed voice in a non-decompressed format. Particularly compressed voice, data and signalling information is transferred to/from other switching nodes over a full-rate channel, for example a leased line comprising a number of 64 kbps channels, each single 64 kbps channel comprising one 8 bits time slot.
  • the method for transferring information between at least a first switching node and a second switching node advantageously comprises the steps of sending voice information between said first and second network nodes combined in one e.g. 64 kbps channel with data and signalling information. If compressed voice information is received, arranging the compressed information subrate channels each in a separate time slot, switching said subrate channels in separate time slots and combining said separate subrate channels with other separate subrate channels comprising compressed voice and/or data and/or signalling information and sending the information of one or more kinds in at least one common time slot to the second switching node.
  • FIG 1 schematically illustrates a switching node handling data and signalling information
  • FIG 2 schematically illustrates a switching node handling data, signalling information and compressed voice
  • FIG 3 illustrates two switching arrangements between which signalling information and data information is transferred
  • FIG 4 illustrates a first and a second switching arrangement according to a second embodiment between which switching arrangements voice, data and signalling information is transferred.
  • Fig 1 schematically illustrates a network switching node 10 which for example may be a standard 64 kbps switching node.
  • the node comprises data access means 11 which in this particular embodiment is a packet/frame relay switching arrangement, here particularly also referred to as packet frame alignment means (PFA) , and signalling handling means 12, in this particular case an ISDN D- channel handler.
  • the packet/frame relay switch 11 receives via the connection line 13 data from a number of data interfaces such as for example V.24, Ethernet, Token Ring etc. In principle, in an advantageous embodiment, the packet switch 11 accepts data from substantially any data interface.
  • the packet/frame relay switch 11 also receives a 64 kbps D-channel from the D-channel handler 12.
  • the D- channel can also be transported as a 16 kbps channel (for example) but in order to avoid delays the transmission rate of 64 kbps is advantageously used.
  • additional access means particularly transparent access means (not shown) are provided for receiving the 64 kbit D-channel.
  • the transparent access means particularly a transparent packet assembler disassembler accepting a HDLC (High Level Data Link) protocol for adaptation provides a terminal access function to facilitate the transparent communication of bit and byte-synchronous type protocols such as HDLC/SDLC and BSC, i.e. transparent transport of such protocols is provided for through the network.
  • HDLC High Level Data Link
  • All data that is received in the packet/frame relay switch 11 is packetized and all the data interfaces compete for the available bandwidth on the trunk to the next data access means of particularly the next packet/frame relay switch in another network switching node (not shown in the figure) .
  • the data access means or particularly the packet/frame relay switch 11 detects if the D- channel 14 contains idle information, i.e. if it contains for example filler bits without any useful signalling information. If the connection comprising the D-channel comprises such idle information or filler bits, such filler bits are removed and replaced by data from the data interfaces 13.
  • the useful signalling information on the D-channel 14 is sent as packets together with the packets generated comprising the information from other data interfaces on a connection line 15 which for example may be an X.25 or a frame relay link to a packet/frame relay switch in another switching node (not shown) with which it communicates.
  • the information thus comprising signalling information and data information is advantageously sent in a full 64 kbit channel to the next switching node.
  • this packet/frame relay switch In a cooperating packet/frame relay switch in said other switching node, this packet/frame relay switch in turn maintains a full 64 kbit connection to the corresponding D- channel handler in said latter switching node through generating idle information replacing the data information which is separated from the signalling information in the packet switching means and deliver it to the relevant address (address information is provided in a manner known per se and it is therefor not further discussed herein) .
  • Packet/frame relay switches as such are well known in the art and e.g. comprise central processing means for measuring and evaluating the amount etc. of data that is transmitted.
  • data as well as signalling information can be sent in a subrate information channel, or the subrate channel can be used for data as well.
  • the switching node 10 of course operates in duplex which is illustrated through the dashed lines illustrating connection links 15', 14', 13'.
  • the switching node also handles voice, particularly compressed voice.
  • the data access means 21 are, similar to the embodiment discussed m Fig 1, arranged inside the switching matrix of for example a private branch exchange, PBX or PABX, for communication with other private branch exchanges using compressed voice channels and data channels and comprising a switch control means for setting up at least one fullrate channel leaving said private branch exchange on a first telecommunication line, which fullrate channel is arranged for connection to said other private branch exchange.
  • a private branch exchange for example a private branch exchange, PBX or PABX
  • the transmission format of the first telecommunication line is divided into frames containing a number of time slots and the fullrate channel occupies a certain time slot, and at least one channel handling device is provided comprising at least one channel input for receiving signals to be output m said fullrate channel, at least one voice channel means connected to a respective channel input and being arranged to compress signals appearing on this respective channel input to signals intended for at least one first subrate traffic channel or to pass at least part of each signal appearing on this channel input unaffected through the voice channel means to said first subrate traffic channel.
  • a subrate traffic channel can be a subrate voice channel or a subrate data channel.
  • a first multiplexer is connected to each voice channel means and arranged to multiplex signals incoming to the multiplexer to outgoing signals m at least two subrate channels provided m the first fullrate channel.
  • Switch control means can advantageously be arranged to dynamically allocate the subrate traffic channels m the fullrate channel to compressed voice and data m dependence of demand.
  • the data access means 21, also here for example m the form a packet/frame relay switch 21, are arranged within the switching node 20 and receives as described under reference to Fig 1 data via a number of data interfaces over the connection lines 23.
  • a full 64 kbps D-channel is via the connection line 24 connected to the packet/frame relay switch 21 in order to minimize the transmission delay.
  • the PFA 21 thus provides for a reduction in the bitrate.
  • a compressing arrangement 27 receives voice over the connection lines 26.
  • the voice information undergoes in the compressing arrangement 27 a 4:1 or a 8:1 or a 2:1 compression.
  • the compressed voice is via the connection line 29 sent to the signal multiplexing means 30.
  • the packet/frame relay switch 21 receives, as discussed above under reference to Fig 1, data information via the connection lines 23 and signalling information from the D-channel handler 22 via the connection line 24. Idle information is removed and the spare bandwidth on the D-channel is used for data traffic.
  • signalling information is given priority.
  • the information comprising the data and the signalling information is sent to the multiplexing arrangement 30 in which voice, data information and signalling information is multiplexed, sent out on a leased line 31
  • Fig. 2 is illustrated how non-compressed voice is received and compressed in the switching node.
  • the node may also receive already compressed voice in which case the voice goes directly to the multiplexing arrangement 30. This as well as the functioning in general will now be more thoroughly explained under reference to Figs 3 and 4 respectively.
  • the first switching arrangement 100 comprises data access means 101, for example a packet/frame relay switch PFA which receives data information Dl, D2, D3, D4 over connection lines 105 from a number of data interfaces as discussed under reference to Figs 1 and 2.
  • the information may for example comprise data from computers, from automatic teller machines etc.
  • the data access means 101 furthermore receives signalling information which may comprise pure signalling information or signalling information and idle information (or just idle information) e.g. in the form of so called filler bits over a connection line 106 which advantageously comprises a full 64 kbit channel.
  • the signalling means 102 receives information from the system software SW 1, i.e. the software of the exchange, for example a PBX (PABX) as discussed above.
  • the information is processed in a protocol, for example the ISDN LAPD protocol (link access protocol for the D-channel) in a manner known per se.
  • the 64 kbit channel on the connection line 106 from the D-channel handler 102 to the packet/frame relay switch 101 may comprise idle information if for example the full bandwidth of the channel is not used for signalling information e.g. in the case of low bandwidth applications.
  • filler information is detected and replaced by data from the data interfaces .
  • VCU board the D-channel handler
  • D-ch Data D1-D4 and the signalling information D-ch is sent over for example an X.25 or frame relay link 107 via a board 104 (VCU board) comprising at least the D-channel handler via a line to an interface board 103 which for example comprises a TLU trunk (trunk line unit) which is an interface board or a standard board, in this case for transferring information between exchanges.
  • the interface board 103 and the VCU-board VCU 1 comprise separate boards so that the VCU outputs can be dynamically allocated to e.g. a leased line or a public network etc. In one embodiment there is e.g. a so called nailed connection through the switch for the interface board. Other alternatives are however also possible.
  • the VCU-board VCU 1 comprises the D-channel handler 102.
  • the data information D1-D4 and the D- channel signalling information D-ch is sent in one time slot TS to the next switching arrangement 200 as discussed above.
  • bandwidth sharing e.g. with dynamic allocation
  • the whole time slot is reserved for data in the embodiment shown in the Fig. 3.
  • the one fourth of each of the data D1-D4 is sent in each subrate channel, at the same time. This is merely schematically illustrated in Fig. 3.
  • packet switching is applied which as such is supposed to be known to the skilled man.
  • the second switching arrangement 200 in a similar manner comprises an interface board, particularly a TLU board 203 which via a line connects to a VCU board 204 which comprises the D-channel handler 202. Via the connection link 207 the data information and the signalling information is sent to the packet/frame relay switch 201.
  • the packet switch 201 extracts the data information Dl, D2, D3 and recognizes the data information D4 which is marked in any convenient manner and separates the data from the signalling information D-ch.
  • the data information is either output to destination computers etc. or sent on to a further switching arrangement, this merely being schematically illustrated through the connection links 205.
  • the PFA 201 means are further provided for adding idle information to the D-channel in order to maintain a full 64 kbit D-channel to the D-channel handler 202 i.e. filler bits are added so that a full 8-bits time slot is created.
  • the signalling information is processed in a manner known per se in the D-channel handler 202 by the LAPD-protocol (ITU-T standard ETS 300 125) and "pure" signalling information is output to the system software SW 2 of the second switching arrangement, e.g. a second private branch exchange .
  • the switching arrangements also comprises means for switching voice or particularly means for switching compressed voice.
  • a switching arrangement 300 is shown which may be comprised m for example a private branch exchange. Also m Fig 4 is merely unidirectional transmission illustrated although the arrangements of course operate m duplex.
  • data D5, D6 is via the connection link 305 input over data interfaces.
  • Data access means or particularly PFA 301 operate m the same manner as described above under reference to the previous figures and it also receives signalling information from the D-channel handler 302 over advantageously a full 64 kbps channel on connection line 306.
  • the D-channel handler 302 m turn receives and processes information from the system software SW 3.
  • idle information is replaced by data information whereupon the data information and the signalling information are packetized.
  • Output from the packet/frame relay switch 301 are m this case two 16 kbps subrate channels m one of which the D5 data information is carried m one time slot and m the other time slot the D6 data information and the signalling information is contained. These channels are input to a time slot assignment arrangement with a signal arranging means comprising a multiplexer 315.
  • the switching arrangement 300 also receives non-compressed voice VI from a telephone 311.
  • the voice information VI comprises 8 bits and is via the connection line 312 sent to a compressing arrangement 313 m which a compressing operation is carried out. Thereafter VI is via connection line 314 sent to multiplexer 315 m one 16 kbps subrate channel.
  • a compressing algorithm such as e.g. the LD-CELP (standardized m ITU-T Rec. G.728) coding algorithm for compression to 16 kbps (4:1 compression).
  • the compression algorithm is m a common ROM of the board (VCU) and it is loaded into e.g. 4 or 8 digital signal processors (DSP) of the board.
  • DSP digital signal processors
  • the switching arrangement 300 receives compressed voice over connection 308 which transports voice in one time slot with four 16 kbps subrate channels.
  • the information is demultiplexed in the demultiplexing arrangement 309 into four time slots, each comprising one 16 kbps subrate channel, i.e. time slots in which (in this example) only two bits are used for information carrying purposes.
  • Three separate subrate channels in this case comprise voice information (calls) for which the switching arrangement 300 forms a terminating switching arrangement. They are therefore decompressed and output to their respective destinations. The decompressing and output is for reasons of clarity not illustrated in the figure.
  • one of the 16 kbps separate subrate channels, carrying voice corresponding to call V2 is to be sent on to switching arrangement 400, i.e.
  • the switching arrangement 300 forms a transit switching arrangement for said call. Therefore one 16 kbps subrate channel comprising voice information V2 is sent in one separate time slot (in which only two bits are used for carrying the information) via the connection line 310 to the multiplexer 315.
  • the multiplexer 315 thus receives voice VI from the compressing arrangement, voice V2 from the demultiplexer 309 and data D5 and D6 and the D-channel information from the packet/frame relay switch 301.
  • the subrate channels are combined in a multiplexer 315 and via connection line 316 sent to an interface board 303 in a manner similar to that described under reference to Fig 3, e.g.
  • a TLU board and output as a full 64 kbps channel comprising one time slot in which two bits are used for voice VI, two bits for voice V2, two bits for data D5 and two bits for the D-channel plus the data D6 over the connection line 317 to an interface board 403, e.g. a TLU-board, in the switching arrangement 400.
  • bandwidth sharing applied. In this case is then 32 kbits used for data (D4 and D5) and signalling information D-ch.
  • On each 16 kbit channel is then e.g. half of D5 sent whereas the other half of D5 is sent on the other 16 kbits channel. It is similar for D6 etc. This is schematically illustrated through the dashed line m the time slot transmitted to switching arrangement 400.
  • the multiplexing arrangement is responsible for the position (m time) and all the information passes via the multiplexer.
  • Signalling information has priority over data and data info may e.g. be prioritized m relation to voice.
  • the time slot comprising the information VI, V2, D5, D6 and D-ch is sent to the demultiplexer 409 m which a demultiplexing operation is carried out to arrange VI, V2, D5 and D6 + D-ch m four separate time slots (or at least one each for VI and V2 respectively) m each of which only (for example) two bits are used for carrying information.
  • addressing information is contained and the voice information, data information and signalling information is sent on to the appropriate arrangements for handling that particular information.
  • the switching arrangement 400 forms a terminating switching arrangement and one 16 kbps subrate channel m which two bits are used for carrying the voice information V2 is thus sent to decompressing arrangement 413 from which 8 bits containing V2 are output to telephone 411.
  • the voice information VI contained m a 16 kbps subrate channel arranged m one separate time slot m which only two bits are used for carrying the information VI is via connection line 410 sent to the multiplexer 415.
  • the voice VI is e.g. combined with other voice information e.g. received via a compressing arrangement (not shown m the figure) and output on connection line 417. This is not further explained since it functions in the same manner as the information output from switching arrangement 300.
  • the data information D5 and D6 as well as the signalling information D-ch is over connection link 407 transported m two time slots to the packet/frame relay switch 401.
  • the D6 data information is marked m any appropriate way and detected and data information D5, D6 is separated from the signalling information D-ch.
  • data information D5 and D6 is output to computers m a manner known per se.
  • To the D-channel signalling information (D-ch) filler bits are added so that a full 64 kbps channel connection 406 to the D- channel handler 402 is maintained.
  • the LAPD protocol of the D-channel handler 402 processes the information and pure signalling information is output to the software SW 4 of the exchange, e.g. a private exchange.
  • the compressing arrangement 313, the demultiplexing arrangement 315 and the D-channel handler 302 of switching arrangement 300 are arranged on a common board, e.g. a so called VCU board, Voice Compression Unit; m this particular case compressing functionality is included, this is however not always the case, c.f. e.g. Fig. 3, the denotation is however used m spite of that.
  • the multiplexer 309 of the switching arrangement 300 is arranged on another (VCU) board.
  • the demultiplexer 409, the decompressing arrangement 413 and the D-channel handler 402 of the second switching arrangement 400 are arranged on a common (VCU) board whereas the multiplexer 415 is arranged on another board.
  • each such board may m a particular embodiment handle one 64 kbit channel.
  • the DEMUX 309 could be on the same board as the D- channel handler 302, MUX 315 and compressing means 313.
  • one D-channel handler handles at least 32 channels, e.g. the tree other channels available on the same board and additional channels from other boards.
  • a board such as e.g. the boards denoted VCU, are connected via the switch to the interface boards, here 303; 403. It may also handle additional channels used for overflow conditions.
  • the D-channel can be transported m any channel.
  • the figure merely illustrates one time slot being transported between the switching arrangement 300 and the switching arrangement 400.
  • a PCM-multiplexed system there can be 32 time slots between the VCU boards as discussed above.
  • 31 time slots could be used for carrying e.g. compressed voice if there are the corresponding number of VCU boards m the respective switching arrangements.
  • more time slots can be used for the combination of voice and data and signalling information or data and signalling information etc.
  • m any combination is not limited to the embodiments as illustrated m the figures, for example in Fig 4 might as well two 8 bits voice information calls be compressed m the compressing arrangement and e.g.
  • bandwidth that may be leased, can be efficiently used. Still another advantage is that signalling information can be transported faster than m hitherto known systems and that, m advantageous embodiments, additional bandwidth can be allocated according to the needs. It is also an advantage that there is only one transmission resource to be supervised as compared to known systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Error Detection And Correction (AREA)
  • Telephonic Communication Services (AREA)

Abstract

L'invention concerne un dispositif et un procédé respectivement utilisés pour la commutation d'informations se présentant au moins sous la forme d'informations de données et d'informations de signalisation, ces dernières étant au moins partiellement transportées sur un canal de signalisation sur voie commune (14). Ledit dispositif de commutation (10) comprend des moyens de gestion de la signalisation (12) conçus pour gérer les informations de signalisation sur ladite voie commune et des moyens d'accès aux données (11) conçus pour gérer les données. Lesdits moyens d'accès aux données (11) comprennent, par ailleurs, des moyens ou des moyens d'accès auxiliaires pour la gestion d'informations de signalisation sur le canal de signalisation sur voie commune et des moyens pour remplacer les informations de repos ou de remplissage sur le canal de signalisation de voie commune par des informations de données.
PCT/SE1997/001621 1996-10-01 1997-09-26 Dispositif d'entrelacement de donnees et d'informations de signalisation WO1998015157A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU45786/97A AU721715B2 (en) 1996-10-01 1997-09-26 Arrangement for interleaving data and signalling information
EP97944248A EP1010347A1 (fr) 1996-10-01 1997-09-26 Dispositif d'entrelacement de donnees et d'informations de signalisation
NO991532A NO991532L (no) 1996-10-01 1999-03-29 Arrangement for innfelling av data og signaleringsinformasjon

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9603598A SE511344C2 (sv) 1996-10-01 1996-10-01 Anordning och förfarande avseende hantering av information i ett kommunikationsnät och ett kommunikationsnät innefattande en dylik anordning
SE9603598-5 1996-10-01

Publications (1)

Publication Number Publication Date
WO1998015157A1 true WO1998015157A1 (fr) 1998-04-09

Family

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Application Number Title Priority Date Filing Date
PCT/SE1997/001621 WO1998015157A1 (fr) 1996-10-01 1997-09-26 Dispositif d'entrelacement de donnees et d'informations de signalisation

Country Status (6)

Country Link
EP (1) EP1010347A1 (fr)
CN (1) CN1239637A (fr)
AU (1) AU721715B2 (fr)
NO (1) NO991532L (fr)
SE (1) SE511344C2 (fr)
WO (1) WO1998015157A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000067517A1 (fr) * 1999-04-28 2000-11-09 Siemens Aktiengesellschaft Systeme multiplex a canaux de transmission de couche 1 et de signalisation
WO2002015599A2 (fr) * 2000-08-15 2002-02-21 Eci Telecom Ltd. Compression d'informations de signalisation
JP2020519100A (ja) * 2017-05-31 2020-06-25 中興通訊股▲ふん▼有限公司Ｚｔｅ Ｃｏｒｐｏｒａｔｉｏｎ フレックスイーサネットプロトコルにおいてトラヒックを伝送する方法、装置及びシステム

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009107985A1 (fr) 2008-02-28 2009-09-03 Lg Electronics Inc. Procédé de multiplexage de données et d’information de commande
CN101960736B (zh) * 2008-02-28 2013-07-31 Lg电子株式会社 复用数据及控制信息的方法

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EP0418851A2 (fr) * 1989-09-19 1991-03-27 Fujitsu Limited Interface de canal D pour RNIS
US5301190A (en) * 1990-08-06 1994-04-05 Fujitsu Limited Communication device having relaying and switching function
US5398246A (en) * 1992-05-14 1995-03-14 Nec Corporation ISDN private local switching system

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EP0418851A2 (fr) * 1989-09-19 1991-03-27 Fujitsu Limited Interface de canal D pour RNIS
US5301190A (en) * 1990-08-06 1994-04-05 Fujitsu Limited Communication device having relaying and switching function
US5398246A (en) * 1992-05-14 1995-03-14 Nec Corporation ISDN private local switching system

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Title
IEEE REGION 10 CONFERENCE ON COMPUTER AND COMMUNICATION, 1990, (Hong Kong), K.Y. KOU et al., "ISDN Bri D-Channel Data Characteristics and Performance", pages 537-540. *
MOTOROLA TECHNICAL DEVELOPMENTS, Volume 17, December 1992, (USA), VERNON FERNANDES, "Enhancedtransmission of Data Over Common Channel Signallining Number 7 Links", pages 145-150. *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000067517A1 (fr) * 1999-04-28 2000-11-09 Siemens Aktiengesellschaft Systeme multiplex a canaux de transmission de couche 1 et de signalisation
WO2002015599A2 (fr) * 2000-08-15 2002-02-21 Eci Telecom Ltd. Compression d'informations de signalisation
WO2002015599A3 (fr) * 2000-08-15 2002-08-08 Eci Telecom Ltd Compression d'informations de signalisation
JP2020519100A (ja) * 2017-05-31 2020-06-25 中興通訊股▲ふん▼有限公司Ｚｔｅ Ｃｏｒｐｏｒａｔｉｏｎ フレックスイーサネットプロトコルにおいてトラヒックを伝送する方法、装置及びシステム
JP7027449B2 (ja) 2017-05-31 2022-03-01 中興通訊股▲ふん▼有限公司 フレックスイーサネットプロトコルにおいてトラヒックを伝送する方法、装置及びシステム

Also Published As

Publication number Publication date
CN1239637A (zh) 1999-12-22
NO991532L (no) 1999-06-01
NO991532D0 (no) 1999-03-29
SE511344C2 (sv) 1999-09-13
EP1010347A1 (fr) 2000-06-21
AU721715B2 (en) 2000-07-13
AU4578697A (en) 1998-04-24
SE9603598L (sv) 1998-04-02
SE9603598D0 (sv) 1996-10-01

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