CA2228495A1 - Circuit arrangement for the alternate circuiting of transmission equipment in ring architectures for the bidirectional transmission of atm cells - Google Patents
Circuit arrangement for the alternate circuiting of transmission equipment in ring architectures for the bidirectional transmission of atm cells Download PDFInfo
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- CA2228495A1 CA2228495A1 CA002228495A CA2228495A CA2228495A1 CA 2228495 A1 CA2228495 A1 CA 2228495A1 CA 002228495 A CA002228495 A CA 002228495A CA 2228495 A CA2228495 A CA 2228495A CA 2228495 A1 CA2228495 A1 CA 2228495A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/437—Ring fault isolation or reconfiguration
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Abstract
In the Prior Art, the alternate circuiting of ATM cells is efficiently controlled upon employment of linear structures. In order to also be able to transfer these structures to ringshaped architectures, a ringshaped structure isinventively formed of linear structures in that further linear structures are linked into the transmission section of a linear structure and the switching equipment of the original linear structure are brought together [or: merged??].
Description
Siemens AG
New Case No. P-98,01~7 Inventor: l~lenk CIRCUIT ARRAN~-7F.l~F.~T FOR THE ALTERNATE CIRCUlTING -OF
TRANSMISSION EQUIPMENT IN RING ARCHITECTURES FOR THE
BIDIRECI IONAL TRANsMT~sIoN OF ATM CELLS
The invention is directed to a circuit arrangement according to the preamble of patent claim 1.
Such a circuit arrangement is already ~3icrlosed by German Patent Applic~tion DE 19646016.6.
Given this known circuit arrangement, trancmiscion eql.ipment are provided for the bidirection~l trancmission of ATM cells, whereby two switching equipment fnnrtioning as terminal points are conn~cte~l to one another via a working entity and a protection entity. The two terminal points respectively contain a monitoring means for detecting trancmiCcion disturbances. A switch means controllable by the monitoring means connects the receiving termin~l pointto the wo,lLng entity in a first switch conflition and to the prote.~on entity in a second switch con~ition Control inforrn tion are e~rh~ng~ between the control devices of the two terminal points. The switch means is lespe~l,vely controlled by the local monitoring méans dependent on local control criteria and on control criteria cont~ine~l in the control inform~tion l~.e;ved from the cooperating locati~n What is thereby disa lv~t~ous is that only the altpm~te circuiting [or:
routing (here ant throughout)~ of trancmiccion e~ ;p...~nt bclween t~,vo t~rminal points is adtressed given this known circuit arrangement. Since ring arrhitecnlres CA 0222849~ 1998-02-02 are particularly employed in the subscriber line network, this method [sic] cannot be employed.
The invention is based on the object of improving a circuit arrangement of the species initially cited such that information that are transmitted according to an asynchronous transfer mode can be transmitted via a plurality of network nodes with great dependability.
Proceeding from the features recited in the preamble of patent claim 1, the invention is achieved by the chararteri7ing features thereof.
It is especially advantageous in the invention that a plurality of linear tr~ncmiccion sections formed of switching equipment are joined to form a ring system. A trancmiCcion section is thereby formed by a working entity and/or a protection entity. This yields the advantage that connections can be efficientlymaintained in such improved ring systems given disruption of the working entity.Advantageous developments of the invention are recited in the subclaims.
The invention is explained in greater detail below with reference to an exemplary embodiment.
Shown are:
Figure 1 a configuration for the bidirectional trancmicsion of ATM cells in a linear 1 + 1 structure;
Figure 2 a configuration for the bidirectional trancmicsion of ATM cells in a linear 1 + 1 structure;
Figure 3 the invell~ive circuit arrangement.
Figure 1 shows two nodes of an ATM network that are each respectively f~chionecl as switching equipment W, E. The ATM cells are transmitted according to an asynchronous transfer mode and respe~iv~ly comprise a header part as well as an information part. The header part serves for the acceptance of conn~ction information, whereas the informatioIl part is serviceable for the acceptance of CA 0222849~ 1998-02-02 useful information. The connection information contained in the header part is fashioned as logical information and is usually f~chion~cl as virtual path number VPI or, respe~iv~ly, virtual ~h~nn~l number VCI. A plurality of these virtual ~h~nnel numbers VCI are thereby respectively combined to form a virtual path number ~I~PI.
It is assumed in the present exemplary embodiment that these switching equipment are a matter of cross connect switching equipment. However, the employment of switching equipment fashioned in this way does not denote a limitation of the invention; other switching equipment can likewise be employed.Figure 1 shows the forward and return tr~ncmiccion of ATM cells belonging to a connecti~n WT between the switching equipment W and the switching equipment E. It is thereby a matter of a linear 1 + 1 structure.
The switching equipment W, E are connecte~ to one another via a working entity WE as well as via a protection entity PE. Further, bridges S via which the incoming ATM cells are accepted and transmitted over the appertaining working entity WE: to the respectively receiving switching equipment E are shown in the respectively transmitting switching equipment.
Further, selection devices SN can be derived from Figure 1 that are respectively allocated to the receiving switching equipment. Their job is comprised in supplying the ATM cells transmitted via the working entities WE to the output of the respectively receiving switc_ing equipment. According to the present embodiment, the selection devices SN are f~chio~ffl as switch me~h~nicm Further, monitoring devices UEo, UE~ (protection domain sink, protection domain source) are shown in both switching equipment W, E that monitor that condition or, respectively, the quality of the ATM cells transmitted via the working entity WE as well as the protection entity PE. A determin~tion as to whether the tr~ncmiccion of the ATM cells has ensued correctly or not can then be CA 0222849~ 1998-02-02 made with the acsistance of these monitoring devices. In particular, a total outage (signal fail for working entity) of a working entity WE can be c~etectecl here.
Deteriorations in the tr~ncmicsion quality (signal degrade), however, can also be i~ntifiecl upon employment of known methods.
T~e monitoring devices UEo, Ue~ termin~te the working entities WE at both sides. Further monitoring devices UEo are arranged at both ends of the protection entity PR. This is intended to serve as tr~ncmicci~n path for the deactivated working entity w~: in case of malfimctio~ Further, alternate circuitprotocols ES are transmitted thereover, these being advantageously fashioned single-phase. This means that, given the occurrence of a malfunction, the protocol is ~rh~nged only once between the two switching equipment. Utmost priority is accorded the int~rtness of the protection entity.
Central control devices (not shown in detail), further, are arranged in each of the switching equipment W, E. These respectively contain local and global priority tables. The status and priority of the appertaining local switching equipment are stored in the former, whereas status and priority of the local butalso of the rest of the switching equipment is deposited in the latter. What theintroduction of the priorities achieves is that, given the simultaneous occurrence of a plurality of alternate circuit requests, which alternate circuit request is to be given priority h mflling is .lefin~l For example, there is a high-priority request from a user. Since a high priority is ~ccignecl to this alternate circuit request, it is thus switched with priority. An ~ltem~te circuit request controlled by the working entity is thus rejected.
The central control devices of the switching equipment W, E e~rh~nge inform~tion in an alternate circuiting protocol ES. This protocol is tr~ncmitte~ via the protection entity and is taken by the allocated monitoring means UEo of the respectively recelvmg switching equipment and supplied to the appertaining CA 0222849~ 1998-02-02 central control means. Further, the central control means sees to it that the switch devices SN are appropriately controlled in case of malf lnction Inform~tion with respect to the generated ~ltern~te circuiting request are deposited in the protocol ES. The protocol is respectively PYch~nged between thetwo switching equipment given generation of the alternate circuiting request. It is provided in a specific development of the invention to cyclically transmit the protocol ES between the two switching equipment.
Figure 2 shows another linear structure with which ATM cells can be altern~t~l~r circuited. This is thereby a 1:1 structure. The dir~elci-ce compared to the 1 + 1 structure shown in Figure 1 is comprised therein that the bridge devices S
shown therein are fashioned as switch devices SO, Sl. Further, the selection means SN of Figure 1 is fashioned as ATM switching network here. The ATM cells con~lllctecl vie the protection entity PE are supplied to this switching network.
The logical path number VPI is taken form the cell header here, inteIpreted and through-connected through the switching network. The drive of switch devices in the receiving switching equipment is thus elimin~ted in this case. Central control means (not shown) having local and global priority tables are likewise contained in the switching equipment W, E according to Figure 2.
The protection entity can remain unused during this time. As warranted, however, special data (extra traffic) can also be supplied to the switching eqllipm~nt E during this time.
The protocol ES here is f~chioned in a different way from the first case.
Thus, further information are deposited here in addition to the information withrespect to the generated alternate circuiting request already addressed in the first case. The;e are thereby a matter of information with respect to the momentary statusses of the switch devices SO, S~. In case of error, the switch devices SO, S~ must be controlled in a corresponding way. The protocol is respe~ively P~h~nged CA 0222849~ 1998-02-02 between the two switching equipment given generation of the ~ltern~te circuitingrequest. It is provided in a specific development of the invention to cyclicallytransmit the protocol ES between the two switching equipment.
Figure 3 shows the inventive circuit arrangement. The switching equipment are thereby interconnected such that a closed ring derives. According to the present exemplary emborlim.ont, this ring should thereby.be composed of linear connecting sectionc, as shown according to Figure 1 of Figure 2. The present exemplary embodiment according to Figure 3 is described with the linear 1 + 1 structure shown in Figure 1 without thereby in~ir~ting a preference for this structure.
Figure 3 shows switching equipment NA~ Nb, NC as well as Nd. Respectively two switching equipment thereby terminate tr~ncmicsion sections. With reference to the example of the switrhing eq~ mrnt N~ and Nd, these are the connecting sections W EAD and WED A. With reference to the r~mrle of the switching equipment N~ and Nb or Nb, NC or NC~ Nd, these are the connecting sections PEA Dand PED A.
According to Figure 3, each of these switching equipment forming a ring comprises a bridge means S as well as a selection means SN. According to the present exemplary embofliment, the switching equipment are connected such that the respectively active working entities WE,~ D and WED A are arranged between the switching equipment NA and ND. The ATM cells inroming via the connection WTA D as well as WTD A are then routed over these working entities. The protection entities, by conirds~, are routed from the switching equipment NA to the switching eqllipmrnt ND via further switching eqllirm-ont NB, NC. The ATM
cells leave the ring thereat in order to be supplied to further means.
Further, the ring formed by the switching equipment is bidirection~lly configured. The return direction of the connrctio~ WTAD is formed by the CA 0222849~ 1998-02-02 connection WTD A. Let it be noted for f~ilit~ted understanding that the two connections are separately treated even though it is a matter of a bidirection~lconnection. It is critical that e~actly one protection entity is respectively allocated to the respectively working entity. According to the present exemplary embo~liment~ the protection entity PEA D is allocated to the working entity WEA D
and the protection entity PED ~ is allocated tO the working entity WED A
functlomng as return dlrectlon.
Further, monitoring means are arranged in the individual switching equipment (not shown in Figure 3). These respectively terminate the working entities WEA-D and WED A as well as the protection entities PEA D and PED A.
Inventively, the virtual path numbers VPI are to be combined to form a virtual path group number VPG. This has the advantage that the alternate circuiting protocol has to be transmitted only once given malfunction of a working entity. It is thereby assumed that one alternate circuiting protocol per virtual path number VPI would otherwise have to be transmitted. Due to the multitude of connections, however, this would lead to a dynamic loading of the ring. Since, however, a plurality of connections with the same virtual path number VPI use the same tr~n~miccinn section and a possible maLfunction usually affects the entire tr~ncmiccion section, a logical bun-lling of the virtual path numbers VPI to form a logical bundle number is advantageous.
It shall be assumed below that the conn~ctioIl WTAD requires that the appertaining ATM cells are supplied to the ring via the switching equipment NA
and in turn depart the ring via the switching equipment ND. In this case, thus, the ATM cells b~longing to the connPction WTAD are supplied to the bridge means S
arranged in the switching eqllipment NA. Since this is p~rm~n~ntly set, the ATM
cells are co~(1uctecl to the switching equipment ND both via the working entity WEA D as well as the protection entity PEA D and leave the ring thereat.
CA 0222849~ 1998-02-02 In the clisturbance-free case, i.e. when no malfilnction is present on the active working entity, the ATM cells are routed directly from the switching equipment NA to the switching equipment ND. When, however, a malf m occurs here, then this is detected by the monitoring means arranged in the receiving switching equipment. Let this be the switching equipment ND in the present case. Subsequently, this imme~ tely supplies the alternate circuiting protocol to the sPnrling switching equipment, i.e. the switching equipment NA~ via the allocated protection entity PE,~ D. At the same time therewith, the selection means SN is switched into the operating con~litio~ that accepts ATM cells via the protection entity PEA D.
The monitoring devices likewise check the operating condition on the protection entities. When, for example, ATM cells are transmitted via the working entity WEA D and when the receiving switching eqllipm~nt, i.e. the switching equipment ND~ identifies a malfunction on the allocated protection entity PEA D,the transrnitting switching equipment NA is informed thereof via information deposited in the alternate circuiting protocol. As a result thereof, a switching onto a malfunctioning protection entity PEA D is prevented from ~n~lling in case of an additional malfunction on the active working entity WEA D.
Inventively, the alternate circuiting protocol is only ~h~nged given the occurrence of malfunctions; a cyclical exchange, however, can likewise be carried out. Likewise, the e~rh~nge of the alternate circuiting protocol can ensue call-individually per virtual path number VPA or, potentially, per virtual ~h~nnel number VCI. However, it must thereby be taken into conci~leration that an additional dynamic load of the ring ensues. It is thereby advantageous, however,that call-associated malf mctionc with respect to the virtual ~h~nn~l nllmber VCI
or, respectively, the virtual path number VPI can be h~nf11e~ with such a procedure. Only the most frequently occurring malfunction on the line can be h~n(llefl with the preferred embodiment of the virtual path group.
In con~hlsi. n, let it be noted that the ring in the present exemplary embodiment is in fact constructed of linear 1 + 1 structures. The employment of a 1:1 structure according to Figure 2, however, yields further advantages. Although the alternate circuiting protocol has a more complex structure, special data can be transmitted here via the protection entity during the disturbance-free time on the working entity. Control data of a general type can thereby be employed as special data. Inventively, the special data can also be f~chione~l as specific traffic data. For example, ABR (available bit rate) or UBR (unspecified bit rate) traffic data thereby come into conci(leration since the services that use these data are cost-bPnefi~
New Case No. P-98,01~7 Inventor: l~lenk CIRCUIT ARRAN~-7F.l~F.~T FOR THE ALTERNATE CIRCUlTING -OF
TRANSMISSION EQUIPMENT IN RING ARCHITECTURES FOR THE
BIDIRECI IONAL TRANsMT~sIoN OF ATM CELLS
The invention is directed to a circuit arrangement according to the preamble of patent claim 1.
Such a circuit arrangement is already ~3icrlosed by German Patent Applic~tion DE 19646016.6.
Given this known circuit arrangement, trancmiscion eql.ipment are provided for the bidirection~l trancmission of ATM cells, whereby two switching equipment fnnrtioning as terminal points are conn~cte~l to one another via a working entity and a protection entity. The two terminal points respectively contain a monitoring means for detecting trancmiCcion disturbances. A switch means controllable by the monitoring means connects the receiving termin~l pointto the wo,lLng entity in a first switch conflition and to the prote.~on entity in a second switch con~ition Control inforrn tion are e~rh~ng~ between the control devices of the two terminal points. The switch means is lespe~l,vely controlled by the local monitoring méans dependent on local control criteria and on control criteria cont~ine~l in the control inform~tion l~.e;ved from the cooperating locati~n What is thereby disa lv~t~ous is that only the altpm~te circuiting [or:
routing (here ant throughout)~ of trancmiccion e~ ;p...~nt bclween t~,vo t~rminal points is adtressed given this known circuit arrangement. Since ring arrhitecnlres CA 0222849~ 1998-02-02 are particularly employed in the subscriber line network, this method [sic] cannot be employed.
The invention is based on the object of improving a circuit arrangement of the species initially cited such that information that are transmitted according to an asynchronous transfer mode can be transmitted via a plurality of network nodes with great dependability.
Proceeding from the features recited in the preamble of patent claim 1, the invention is achieved by the chararteri7ing features thereof.
It is especially advantageous in the invention that a plurality of linear tr~ncmiccion sections formed of switching equipment are joined to form a ring system. A trancmiCcion section is thereby formed by a working entity and/or a protection entity. This yields the advantage that connections can be efficientlymaintained in such improved ring systems given disruption of the working entity.Advantageous developments of the invention are recited in the subclaims.
The invention is explained in greater detail below with reference to an exemplary embodiment.
Shown are:
Figure 1 a configuration for the bidirectional trancmicsion of ATM cells in a linear 1 + 1 structure;
Figure 2 a configuration for the bidirectional trancmicsion of ATM cells in a linear 1 + 1 structure;
Figure 3 the invell~ive circuit arrangement.
Figure 1 shows two nodes of an ATM network that are each respectively f~chionecl as switching equipment W, E. The ATM cells are transmitted according to an asynchronous transfer mode and respe~iv~ly comprise a header part as well as an information part. The header part serves for the acceptance of conn~ction information, whereas the informatioIl part is serviceable for the acceptance of CA 0222849~ 1998-02-02 useful information. The connection information contained in the header part is fashioned as logical information and is usually f~chion~cl as virtual path number VPI or, respe~iv~ly, virtual ~h~nn~l number VCI. A plurality of these virtual ~h~nnel numbers VCI are thereby respectively combined to form a virtual path number ~I~PI.
It is assumed in the present exemplary embodiment that these switching equipment are a matter of cross connect switching equipment. However, the employment of switching equipment fashioned in this way does not denote a limitation of the invention; other switching equipment can likewise be employed.Figure 1 shows the forward and return tr~ncmiccion of ATM cells belonging to a connecti~n WT between the switching equipment W and the switching equipment E. It is thereby a matter of a linear 1 + 1 structure.
The switching equipment W, E are connecte~ to one another via a working entity WE as well as via a protection entity PE. Further, bridges S via which the incoming ATM cells are accepted and transmitted over the appertaining working entity WE: to the respectively receiving switching equipment E are shown in the respectively transmitting switching equipment.
Further, selection devices SN can be derived from Figure 1 that are respectively allocated to the receiving switching equipment. Their job is comprised in supplying the ATM cells transmitted via the working entities WE to the output of the respectively receiving switc_ing equipment. According to the present embodiment, the selection devices SN are f~chio~ffl as switch me~h~nicm Further, monitoring devices UEo, UE~ (protection domain sink, protection domain source) are shown in both switching equipment W, E that monitor that condition or, respectively, the quality of the ATM cells transmitted via the working entity WE as well as the protection entity PE. A determin~tion as to whether the tr~ncmiccion of the ATM cells has ensued correctly or not can then be CA 0222849~ 1998-02-02 made with the acsistance of these monitoring devices. In particular, a total outage (signal fail for working entity) of a working entity WE can be c~etectecl here.
Deteriorations in the tr~ncmicsion quality (signal degrade), however, can also be i~ntifiecl upon employment of known methods.
T~e monitoring devices UEo, Ue~ termin~te the working entities WE at both sides. Further monitoring devices UEo are arranged at both ends of the protection entity PR. This is intended to serve as tr~ncmicci~n path for the deactivated working entity w~: in case of malfimctio~ Further, alternate circuitprotocols ES are transmitted thereover, these being advantageously fashioned single-phase. This means that, given the occurrence of a malfunction, the protocol is ~rh~nged only once between the two switching equipment. Utmost priority is accorded the int~rtness of the protection entity.
Central control devices (not shown in detail), further, are arranged in each of the switching equipment W, E. These respectively contain local and global priority tables. The status and priority of the appertaining local switching equipment are stored in the former, whereas status and priority of the local butalso of the rest of the switching equipment is deposited in the latter. What theintroduction of the priorities achieves is that, given the simultaneous occurrence of a plurality of alternate circuit requests, which alternate circuit request is to be given priority h mflling is .lefin~l For example, there is a high-priority request from a user. Since a high priority is ~ccignecl to this alternate circuit request, it is thus switched with priority. An ~ltem~te circuit request controlled by the working entity is thus rejected.
The central control devices of the switching equipment W, E e~rh~nge inform~tion in an alternate circuiting protocol ES. This protocol is tr~ncmitte~ via the protection entity and is taken by the allocated monitoring means UEo of the respectively recelvmg switching equipment and supplied to the appertaining CA 0222849~ 1998-02-02 central control means. Further, the central control means sees to it that the switch devices SN are appropriately controlled in case of malf lnction Inform~tion with respect to the generated ~ltern~te circuiting request are deposited in the protocol ES. The protocol is respectively PYch~nged between thetwo switching equipment given generation of the alternate circuiting request. It is provided in a specific development of the invention to cyclically transmit the protocol ES between the two switching equipment.
Figure 2 shows another linear structure with which ATM cells can be altern~t~l~r circuited. This is thereby a 1:1 structure. The dir~elci-ce compared to the 1 + 1 structure shown in Figure 1 is comprised therein that the bridge devices S
shown therein are fashioned as switch devices SO, Sl. Further, the selection means SN of Figure 1 is fashioned as ATM switching network here. The ATM cells con~lllctecl vie the protection entity PE are supplied to this switching network.
The logical path number VPI is taken form the cell header here, inteIpreted and through-connected through the switching network. The drive of switch devices in the receiving switching equipment is thus elimin~ted in this case. Central control means (not shown) having local and global priority tables are likewise contained in the switching equipment W, E according to Figure 2.
The protection entity can remain unused during this time. As warranted, however, special data (extra traffic) can also be supplied to the switching eqllipm~nt E during this time.
The protocol ES here is f~chioned in a different way from the first case.
Thus, further information are deposited here in addition to the information withrespect to the generated alternate circuiting request already addressed in the first case. The;e are thereby a matter of information with respect to the momentary statusses of the switch devices SO, S~. In case of error, the switch devices SO, S~ must be controlled in a corresponding way. The protocol is respe~ively P~h~nged CA 0222849~ 1998-02-02 between the two switching equipment given generation of the ~ltern~te circuitingrequest. It is provided in a specific development of the invention to cyclicallytransmit the protocol ES between the two switching equipment.
Figure 3 shows the inventive circuit arrangement. The switching equipment are thereby interconnected such that a closed ring derives. According to the present exemplary emborlim.ont, this ring should thereby.be composed of linear connecting sectionc, as shown according to Figure 1 of Figure 2. The present exemplary embodiment according to Figure 3 is described with the linear 1 + 1 structure shown in Figure 1 without thereby in~ir~ting a preference for this structure.
Figure 3 shows switching equipment NA~ Nb, NC as well as Nd. Respectively two switching equipment thereby terminate tr~ncmicsion sections. With reference to the example of the switrhing eq~ mrnt N~ and Nd, these are the connecting sections W EAD and WED A. With reference to the r~mrle of the switching equipment N~ and Nb or Nb, NC or NC~ Nd, these are the connecting sections PEA Dand PED A.
According to Figure 3, each of these switching equipment forming a ring comprises a bridge means S as well as a selection means SN. According to the present exemplary embofliment, the switching equipment are connected such that the respectively active working entities WE,~ D and WED A are arranged between the switching equipment NA and ND. The ATM cells inroming via the connection WTA D as well as WTD A are then routed over these working entities. The protection entities, by conirds~, are routed from the switching equipment NA to the switching eqllipmrnt ND via further switching eqllirm-ont NB, NC. The ATM
cells leave the ring thereat in order to be supplied to further means.
Further, the ring formed by the switching equipment is bidirection~lly configured. The return direction of the connrctio~ WTAD is formed by the CA 0222849~ 1998-02-02 connection WTD A. Let it be noted for f~ilit~ted understanding that the two connections are separately treated even though it is a matter of a bidirection~lconnection. It is critical that e~actly one protection entity is respectively allocated to the respectively working entity. According to the present exemplary embo~liment~ the protection entity PEA D is allocated to the working entity WEA D
and the protection entity PED ~ is allocated tO the working entity WED A
functlomng as return dlrectlon.
Further, monitoring means are arranged in the individual switching equipment (not shown in Figure 3). These respectively terminate the working entities WEA-D and WED A as well as the protection entities PEA D and PED A.
Inventively, the virtual path numbers VPI are to be combined to form a virtual path group number VPG. This has the advantage that the alternate circuiting protocol has to be transmitted only once given malfunction of a working entity. It is thereby assumed that one alternate circuiting protocol per virtual path number VPI would otherwise have to be transmitted. Due to the multitude of connections, however, this would lead to a dynamic loading of the ring. Since, however, a plurality of connections with the same virtual path number VPI use the same tr~n~miccinn section and a possible maLfunction usually affects the entire tr~ncmiccion section, a logical bun-lling of the virtual path numbers VPI to form a logical bundle number is advantageous.
It shall be assumed below that the conn~ctioIl WTAD requires that the appertaining ATM cells are supplied to the ring via the switching equipment NA
and in turn depart the ring via the switching equipment ND. In this case, thus, the ATM cells b~longing to the connPction WTAD are supplied to the bridge means S
arranged in the switching eqllipment NA. Since this is p~rm~n~ntly set, the ATM
cells are co~(1uctecl to the switching equipment ND both via the working entity WEA D as well as the protection entity PEA D and leave the ring thereat.
CA 0222849~ 1998-02-02 In the clisturbance-free case, i.e. when no malfilnction is present on the active working entity, the ATM cells are routed directly from the switching equipment NA to the switching equipment ND. When, however, a malf m occurs here, then this is detected by the monitoring means arranged in the receiving switching equipment. Let this be the switching equipment ND in the present case. Subsequently, this imme~ tely supplies the alternate circuiting protocol to the sPnrling switching equipment, i.e. the switching equipment NA~ via the allocated protection entity PE,~ D. At the same time therewith, the selection means SN is switched into the operating con~litio~ that accepts ATM cells via the protection entity PEA D.
The monitoring devices likewise check the operating condition on the protection entities. When, for example, ATM cells are transmitted via the working entity WEA D and when the receiving switching eqllipm~nt, i.e. the switching equipment ND~ identifies a malfunction on the allocated protection entity PEA D,the transrnitting switching equipment NA is informed thereof via information deposited in the alternate circuiting protocol. As a result thereof, a switching onto a malfunctioning protection entity PEA D is prevented from ~n~lling in case of an additional malfunction on the active working entity WEA D.
Inventively, the alternate circuiting protocol is only ~h~nged given the occurrence of malfunctions; a cyclical exchange, however, can likewise be carried out. Likewise, the e~rh~nge of the alternate circuiting protocol can ensue call-individually per virtual path number VPA or, potentially, per virtual ~h~nnel number VCI. However, it must thereby be taken into conci~leration that an additional dynamic load of the ring ensues. It is thereby advantageous, however,that call-associated malf mctionc with respect to the virtual ~h~nn~l nllmber VCI
or, respectively, the virtual path number VPI can be h~nf11e~ with such a procedure. Only the most frequently occurring malfunction on the line can be h~n(llefl with the preferred embodiment of the virtual path group.
In con~hlsi. n, let it be noted that the ring in the present exemplary embodiment is in fact constructed of linear 1 + 1 structures. The employment of a 1:1 structure according to Figure 2, however, yields further advantages. Although the alternate circuiting protocol has a more complex structure, special data can be transmitted here via the protection entity during the disturbance-free time on the working entity. Control data of a general type can thereby be employed as special data. Inventively, the special data can also be f~chione~l as specific traffic data. For example, ABR (available bit rate) or UBR (unspecified bit rate) traffic data thereby come into conci(leration since the services that use these data are cost-bPnefi~
Claims (14)
1. Circuit arrangement for the alternate circuiting of transmission equipment in ring architectures for the bidirectional transmission of ATM cells,comprising at least two switching equipment (NA, ND) that respectively terminate a transmission section formed of working entities (WEA-D, WED-A) and/or protectionentities (PEA-D, PED-A) and between which information is supplied in ATM cells via this transmission section, whereby, given a malfunction on the appertaining transmission section, the ATM cells hitherto transmitted thereover are potentially rerouted onto the protection entity according to priority criteria and logical connection information, characterized in that a plurality of switching equipment (NB, NC) are linked into the transmission section and the at least two switching equipment (NA, ND) are brought together [or: merged??].
2. Circuit arrangement according to claim 1, characterized in that a protection entity (PEA-D, PED-A) is allocated to the working entity (WEA-D, WED-A), and a priority is respectively allocated to both entities.
3. Circuit arrangement according to claim 1 or 2, characterized in that, in the alternate circuiting case, an alternate circuiting request is generated to which further priorities are allocated.
4. Circuit arrangement according to claim 1, characterized in that the logical connection information is the number of a virtual channel (VCI) and/or the number of a virtual path (VPI) and/or the number of a virtual path group (VPG) that is formed of a plurality of virtual paths (VPI).
5. Circuit arrangement according to claim 1 through 4, characterized in that local and global priority tables in which the rank of the priorities is determined are provided.
6. Circuit arrangement according to one of the preceding claims, characterized in that, upon arrival of an alternate circuiting request in the receiving switching equipment, an alternate circuiting protocol is generated that is supplied only once to the transmitting switching equipment via the protection entity (PE).
7. Circuit arrangement according to one of the preceding claims, characterized in that total outage and degradation of a working entity are detected in the monitoring means of the receiving switching equipment.
8. Circuit arrangement according to one of the preceding claims, characterized in that the switching equipment are fashioned as cross-connect switch devices.
9. Circuit arrangement according to one of the preceding claims, characterized in that the alternate circuiting potentially ensues by driving a switch means (S0, S1) contained in the transmitting switching equipment as well as uponemployment of a selection means (SN) arranged in the receiving switching equipment.
10. Circuit arrangement according to one of the preceding claims, characterized in that special data are transmitted over the protection entity (PE) during malfunction-free times.
11. Circuit arrangement according to preceding claims [sic], characterized in that special data are fashioned as ABR or UBR traffic data.
12. Circuit arrangement according to one of the preceding claims, characterized in that the selection means (SN) is fashioned as ATM switching network and/or as simple switch element.
13. Circuit arrangement according to one of the claims 1 through 8, characterized in that the switch means (S) arranged in the transmitting switching equipment can be permanently set.
14. Circuit arrangement according to one of the preceding claims, characterized in that the alternate circuiting protocol is cyclically exchanged between the transmitting switching equipment and the receiving switching equipment.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19703993A DE19703993A1 (en) | 1997-02-03 | 1997-02-03 | Circuit arrangement for the equivalent switching of transmission devices in ring architectures for the bidirectional transmission of ATM cells |
| DE19703993.6 | 1997-02-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2228495A1 true CA2228495A1 (en) | 1998-08-03 |
Family
ID=7819163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002228495A Abandoned CA2228495A1 (en) | 1997-02-03 | 1998-02-02 | Circuit arrangement for the alternate circuiting of transmission equipment in ring architectures for the bidirectional transmission of atm cells |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0857003A3 (en) |
| JP (1) | JPH10303929A (en) |
| CA (1) | CA2228495A1 (en) |
| DE (1) | DE19703993A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1130853A1 (en) * | 2000-02-29 | 2001-09-05 | Siemens Aktiengesellschaft | Circuit arrangement for changeover to standby of transmission installations in ring architectures with MPLS-packets |
| EP1130852A1 (en) * | 2000-02-29 | 2001-09-05 | Siemens Aktiengesellschaft | Method for changeover to standby of transmission installations in ring architectures with MPLS-packets |
| CN100336357C (en) * | 2005-08-25 | 2007-09-05 | 上海交通大学 | Redundant crossing ring data bus network topological structure |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3071007B2 (en) * | 1991-10-22 | 2000-07-31 | 富士通株式会社 | Communication network control method |
| DE4332824C1 (en) * | 1993-09-27 | 1995-03-16 | Siemens Ag | Method and circuit arrangement for transmitting message cells over virtual paths of an ATM communication system |
| JP2817768B2 (en) * | 1994-12-27 | 1998-10-30 | 三菱電機株式会社 | Ring type ATM network system |
-
1997
- 1997-02-03 DE DE19703993A patent/DE19703993A1/en not_active Withdrawn
-
1998
- 1998-02-02 CA CA002228495A patent/CA2228495A1/en not_active Abandoned
- 1998-02-03 JP JP10021702A patent/JPH10303929A/en active Pending
- 1998-02-03 EP EP98101830A patent/EP0857003A3/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0857003A3 (en) | 1999-09-08 |
| DE19703993A1 (en) | 1998-08-06 |
| JPH10303929A (en) | 1998-11-13 |
| EP0857003A2 (en) | 1998-08-05 |
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| Date | Code | Title | Description |
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| FZDE | Dead |