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Marconi OMS 1200

Technical Product Description

221 02-ZAP 701 25/1 Rev C 2006-08-04

03PHB00004AAV-CUA

Commercial in confidence

65 (136)

•

1/4 –Core Ring (MSP line protection).

Figure 7-2: 4/16-Core Ring (MSP Line Protection)

STM-4/16

MSP (terminal)

OMS1200 STM4/16

LINE

In this example shown in Figure 7-2 MSP is configured for the line interfaces. Core B
then acts as a protection card and does not carry normal worker traffic. MSP can only
be used for Terminal applications.

Summary of Contents for Marconi OMS 1200

Page 1: ...221 02 ZAP 701 25 1 Rev C 2006 08 04 Marconi OMS 1200 Optical MultiService Metro Edge Technical Product Description Release 3 4 ...

Page 2: ...d shall protect the same in whole or in part from disclosure and dissemination to third parties Disclosure and disseminations to the receiver s employees shall only be made on a strict need to know basis The information in this work is subject to change without notice and Ericsson Limited assumes no responsibility for factual inaccuracies or typographical errors Ericsson Limited has used all reaso...

Page 3: ... 1 4 OMS 1240 with STM 1 4 Core Card Summary 17 2 1 5 OMS 1260 with STM 1 4 Core Card Summary 18 2 1 6 OMS 1200 with STM 4 16 Core Card Summary 19 2 2 OMS 1240 Product Structure 20 2 2 1 Subrack for OMS 1240 20 2 2 2 OMS 1240 Shelf and Cards 21 2 2 3 Cooling the OMS 1240 Subrack 22 2 3 OMS 1260 Product Structure 22 2 3 1 Subrack for OMS 1260 22 2 3 2 OMS 1260 Shelf and Cards 23 2 3 3 Cooling the O...

Page 4: ...view 35 3 1 Network Management 35 3 2 Synchronisation 35 3 3 Protection 36 3 3 1 MSP Protection 36 3 3 2 Sub Network Connection Protection 36 3 4 Cross Connections 37 3 5 Engineer s Order Wire EOW 37 3 6 Other Licensed Operator s Networks 38 3 6 1 Remote Management via VC 12 n x 64kbit s Comms Channels 39 3 7 IP Management of Third Party Co Located Equipment 40 3 8 Tandem Connection Monitoring TCM...

Page 5: ...9 6 2 2 SETG Timing 49 6 2 3 Holdover 49 6 3 Timing Marker Operation 50 6 3 1 Destination ID 50 6 4 Revertive Non revertive Operation 50 6 5 Wait to Restore Period 50 6 6 Priority Table Options 50 6 7 Ext Tributary Clock Selection 52 6 7 1 OMS1240 Tributary Selection 52 6 7 2 OMS1260 Tributary Selection 52 6 8 SDH Timing Sources 52 6 9 PDH Timing Sources 52 6 10 External Timing Input 52 6 10 1 Ext...

Page 6: ...Comms Configuration 60 6 17 3 PDH Tributary Card 60 6 17 4 Synchronisation Configuration on Reset 60 Chapter 7 Protection Schemes 61 7 1 Introduction to Protection 61 7 2 General Protection Information and Architecture Rules 61 7 2 1 OMS 1240 Protection Rules 61 7 2 2 OMS 1260 Protection Rules 63 7 3 Intra Inter Card MSP and SNCP Protection 70 7 4 SDH Trail Linear Multiplex Section Protection MSP ...

Page 7: ... Time and K1 K2 Protocol Timing 88 7 5 VC Trail SNCP 89 7 5 1 Introduction to SNCP 89 7 5 2 Modes of Operation for SNCP 90 7 5 3 Protection Switching Criteria for SNCP 91 7 5 4 Protection Switching Control for SNCP 97 7 5 5 Protection Switching Time 99 7 6 1 1 Tandem VC Trail SNC Protection TSNCP 100 7 6 1 Introduction to TSNCP 100 7 6 2 Modes of Operation for TSNCP 100 7 6 3 Protection Switching ...

Page 8: ...ria 123 7 9 3 Protection Switching Control 126 7 9 4 Protection Switching Time 127 7 9 5 PDH Port Protection Architecture 127 7 10 MULTIPLEX SECTION SHARED PROTECTION MS SPRING 127 7 10 1 Introduction 127 7 11 Protection Switching Control 128 7 11 1 External Controls 128 7 11 2 Local Autonomous Controls SF SD Flags 129 7 11 3 Wait to Restore 130 7 11 4 Remotely Signalled Controls 130 7 11 5 Bi dir...

Page 9: ...oups Showing Bandwidth Available 32 Figure 3 1 Engineers Order Wire 37 Figure 3 2 Off Net Customer Network Configuration 38 Figure 3 3 Example of Remote Management over OLO Network 39 Figure 3 4 IP Management of Third Party Co Located Equipment 40 Figure 4 1 Network Configurations 43 Figure 4 2 Ring Applications 44 Figure 4 3 Broadcast 44 Figure 4 4 Ethernet Private Line 45 Figure 6 1 SASE Mode Di...

Page 10: ... MSP Protection with STM 4 16 Core Card 75 Figure 7 9 STM 1 4 Core Card Equipping Options 108 Figure 7 10 STM 4 16 Core Card Equipping Options 109 Figure 7 11 SDM Architecture Example Connections with the OMS 1240 113 Figure 7 12 2 Fibre MS SPRING Ring Protection Switch Concept 134 Figure 7 13 2 Fibre MS SPRING MultiRing Protection Switch Concept 135 Figure 7 14 2 Fibre MS SPRING Misconnected Traf...

Page 11: ...Table 7 2 OMS 1240 Protection Configuration Options 62 Table 7 3 Slot Position Rules for OMS 1260 Core Card and Protection Options 63 Table 7 4 Slot Position Rules for OMS 1260 Generic Tributary Cards and Protection Options 67 Table 7 5 Slot Position Rules for Generic Tributary LTUs and 2M Balanced LTUs 67 Table 7 6 Slot Equipping rules for 63x2M Unbalanced LTU 02HAM 00003 AAL 68 Table 7 7 Slot Eq...

Page 12: ...iption 221 02 ZAP 701 25 1 Rev C 2006 08 04 Ericsson AB 2006 03PHB00004AAV CUA Commercial in confidence 12 136 Table 7 16 Protected PDH Channels 122 Table 7 17 Protected PDH Channels 123 Table 7 18 PDH Port Priority of Failure Conditions 125 ...

Page 13: ...etails The Safety Guide handbook provides other safety related information Chapter 6 Synchronisation Discusses timing synchronisation operator configurations and card configuration in relation to regular operation of the OMS 1200 equipment Chapter 7 Protection Schemes Discusses a more detailed description of the functioning protection systems as background information to the instructions supplied ...

Page 14: ...Marconi OMS 1200 Technical Product Description 221 02 ZAP 701 25 1 Rev C 2006 08 04 Ericsson AB 2006 03PHB00004AAV CUA Commercial in confidence 14 136 Blank Page ...

Page 15: ...ich are deployed extensively in SDH access networks in street cabinets local exchanges and directly in customer premises and complements these products The OMS 1200 is managed by Ericsson s ServiceOn Optical Element Manager or by a local terminal All members of the OMS 1200 offer Up to two Core cards each providing a fully non blocking switch matrix supporting cross connections of all container si...

Page 16: ...s but typical uses may include the following locations Telecom centres Equipment buildings designated with restricted access controls Environment as designated for telecom centres where the equipment requirement for operational performance is EN 300 019 1 3 Class 3 2 Locations assumed to have the status of equipment rooms or cabinets in end customer premises Rooms and cabinets providing for restri...

Page 17: ...rs seven generic tributary card slots with five being available when using an STM 1 4 core card and all seven being available when using an STM 4 16 core card 2 1 4 OMS 1240 with STM 1 4 Core Card Summary OMS 1240 with STM 1 4 Core Card is intended for applications requiring high volume of 2Mbit s transport at STM 1 and for light traffic STM 4 applications that require the flexibility and protecti...

Page 18: ...n suitable for customer premises Hot pluggable SFP modules including optical STM 1 STM 4 and electrical STM 1 modules Power LCT LTU providing duplicated DC power inputs plus LCT interface connection 2 1 5 OMS 1260 with STM 1 4 Core Card Summary The OMS 1260 with STM 1 4 core card is intended for applications requiring a higher capacity subrack than that afforded by the OMS 1240 with a STM 1 4 core...

Page 19: ...4 16 core card replaces the STM 1 4 core card in both OMS 1240 and OMS 1260 subracks to provide an upgrade to the STM 16 aggregate line rate The STM 4 16 core card can as its name implies also operate at STM 4 CAUTION The STM1 4 core cards are not compatible with the STM 4 16 core cards When upgrading a network element from STM1 4 to STM4 16 both existing STM1 4 core cards must be removed before a...

Page 20: ...this case the overall subrack width is 452mm excluding rack side mounting assemblies As a single unit horizontally aligned in a standard 19 rack using the appropriate horizontal subrack mounting kit In this case the overall subrack vertical space occupancy is 227mm allowing it to fit easily within the 264mm of a 6 VU rack height envelope As a single OMS 1240 unit vertically aligned and mounted sid...

Page 21: ...0004AAV CUA Commercial in confidence 21 136 Figure 2 2 OMS1240 with Battery Box For further information on the use of the Battery Box unit see 03PHB00002AAR AC Power Battery Back up Unit 2 2 2 OMS 1240 Shelf and Cards The basic subrack structure is illustrated in Figure 2 3 Figure 2 3 Basic OMS 1240 Subrack ...

Page 22: ...bracks where natural convection current airflow is negligible For vertical subrack mounting fan installation is required only for certain specific configurations or if high inlet air temperatures are expected 2 3 OMS 1260 Product Structure 2 3 1 Subrack for OMS 1260 The OMS 1260 subrack is designed for installation in a standard vertical airflow alignment in an ETSI metric or 19 or DIN 19 equipmen...

Page 23: ...anking plates supplied in the core SE 2 4 Power Supply Architecture The OMS 1200 equipment requires telecommunications industry standard DC power supplies as defined in EN 300 132 2 and described in the Safety Guide handbook A variation is applied in that the rated voltage range of the OMS 1200 equipment is extended to 38 4Vdc at the low end and to 75Vdc at the high end Two power input ports are p...

Page 24: ...erial port connector and a cable directly to a PC serial port to provide local subrack management The OMS 1240 Power LCT LTU is available in two versions differing only in the type of power input connector one is equipped with 9 pin D Type connectors the other is equipped with 3 pin Power D Type connectors OMS 1240 LTU with 9 Pin D Type 1HAM 61217 AAK OMS 1240 LTU with 3 Pin Power D Type 1HAM 6121...

Page 25: ...is then distributed via the backplane to its associated generic tributary slot This card type is used with Generic Tributary cards that have front panel access to interface cables There are two versions of this card Generic Tributary Power LTU Version 1 1HAM61218AAM This card is now obsolete but may be found in early installed OMS 1200 subracks Generic Tributary Power LTU Version 2 1HAM61232AAE Th...

Page 26: ...return to a previous version of software System configuration and status data is stored in non volatile configuration database memory Software download is available to all cards including the tributary modules either from the element manager or via the LCT The subrack provides two slots for core switch line units Equipping the Core Switch Line Unit A slot with a core CCU card creates an unprotecte...

Page 27: ...RING protection schemes 2 5 3 OMS 1240 64x2Mbit s Core Tributary Card and LTUs The OMS 1240 employs a single dedicated Core Tributary card to provide up to 64 channels of 2Mbit s PDH traffic with interface cable connection ports provided exclusively by LTUs The Core Tributary card provides the HDB3 line drivers and receivers permitting the LTUs to be simple cards providing only interface cable con...

Page 28: ...hese can be installed per 2M tributary card and up to twelve can be installed per subrack thus providing a maximum of 252x2Mbit s balanced ports OMS 1260 63x2Mbit s Unbalanced LTU SP60EA The standard Unbalanced LTU option consists of a single 63 port LTU this being a composite module consisting of three SIU cards plus a front panel providing 126 1 0 2 3 coaxial connectors The installation of any s...

Page 29: ...th it a generic tributary PSU LTU slot Seven generic tributary slots are provided in the OMS 1260 subrack each one having associated with it a generic tributary PSU LTU slot Only Slots 1 5 are available for use with an STM 1 4 core card The STM 4 16 core card has access to all seven slots The generic tributary slots are capable of supporting a range of generic SMA tributary cards including PDH SDH...

Page 30: ...Asynchronous 1HAT60623BAQ 3 PDH 1 x 140Mbit s Asynchronous 1HAT60624BFE 4 PDH 34 Transmux Async Byte Bit floating 1HAT60979AAC 5 SDH STM 1 G703 Electrical 1HAT60803ABT 6 SDH STM 1 G957 L 1 1 1HAT60791ABU AFP 8 SDH STM 1 G957 L 1 2 1HAT60791ACM AGG 9 SDH Dual STM 1 card G703 Electrical 1HAT61004ABP 10 SDH Flexible dual STM 1 1HAT60878AAT 11 SDH Quad STM 1 G703 Electrical 1HAT61059AAJ 12 SDH Quad ST...

Page 31: ...as shown in Figure 2 7 and are therefore mutually exclusive For each tributary group a slide mechanism at the front of the OMS 1260 subrack prevents incorrect card installation by physically preventing insertion of more than one card into that tributary group Note Generic Tributary Card Slots 5 6 and 7 are not associated with 2M tributary cards i e they do not belong to any tributary group As show...

Page 32: ...es 2 x STM 1 and all 2M tributaries use only 1 x STM 1 out of the two available 2 5 7 Comms Auxiliary Ancillary Unit Access to selected section overhead SOH bytes is provided by the auxiliary interface enabling for example low rate external telemetry signals to be carried within the SDH SOH EOW functionality is provided by an external stand alone unit which plugs into the comms aux ancillary card ...

Page 33: ...x 2 4 SU66AA STM 1 S1 1 LC 2 4 SU66AB STM 1 L1 1 LC 2 4 SU66AC STM 1 L1 2 LC 2 4 SU67AA STM 4 S4 1 LC 2 1 1 SU67AB STM 4 L4 1 LC 2 1 1 SU67AC STM 4 L4 2 LC 2 1 1 SU67AD STM 4 L4 1 LC 2 1 1 SU67AE STM 4 L4 2 LC 2 1 1 SU68AB STM 16 S16 1 LC 1 SU68AC STM 16 L16 1 LC 1 SU68AD STM 16 L16 2 LC 1 1 STM 1 4 Core 1HAT61105AAF STM 1 4 Core CCU 1HAT61114AAT STM 1 4 Protection Core 2 STM 4 16 Core 03HAT00041A...

Page 34: ...el 3 Blue 1511 1 SU68CD λ Channel 4 Green 1531 1 SU68CE λ Channel 5 Yellow 1551 1 SU68CF λ Channel 6 Orange 1571 1 SU68CG λ Channel 7 Red 1591 1 SU68CH λ Channel 8 Brown 1611 1 Table 2 4 Long Haul SFP Modules for CWDM SE Code Function Bail Colour Wavelength Nominal nm STM 4 16 Core 2 SU68CN λ Channel 1 Grey 1471 1 SU68CO λ Channel 2 Violet 1491 1 SU68CP λ Channel 3 Blue 1511 1 SU68CQ λ Channel 4 G...

Page 35: ...LO networks NM information for third party IP managed equipment can also be carried across the SDH network by the IP Tunnelling feature The equipment management operations systems use Ericsson standard workstation terminals for providing management and control of the element Software download is achieved from the LCT or from the ServiceOn Optical Element Managers 3 2 Synchronisation The following ...

Page 36: ...set threshold in the range of 10 5 to 10 9 Command from the LCT or from the network management system 3 3 2 Sub Network Connection Protection The Sub Network Connection Protection is defined in ITU T Rec G 841 When OMS 1200 products are connected in a sub network e g a ring topology the relevant VC to be protected may be protected by transmitting it from the tributary to both STM n line interfaces...

Page 37: ...nnels on the Aux Ancillary Card The Aux channel can be selected from one of the configurable section overhead bytes These overhead bytes can be sourced from either Line or Trib SDH interfaces Figure 3 1 Engineers Order Wire Line WEST Line EAST EOW Unit External 64k AUX Channels Handset Line WEST Line EAST EOW Unit External Handset 64k AUX Channels EOW Unit External Handset 64k AUX Channels EOW Uni...

Page 38: ...ment information for crossing OLO networks Note For the OMS 1260 equipment only Comms OH access is only available on Port 1 of the Dual STM 1e Trib When the OMS 1240 is used in the customer premises connected via leased line from another operator or connecting via SDH equipment where the normal DCC cannot be used the F2 byte in the path overhead is used to carry the management communications traff...

Page 39: ...nt comms data Leasing the VC 12 will give transparent transport across the OLO network This may be desirable if an operator does not wish to pay the premium of leasing a full VC 4 however this will be at the cost of losing a VC 12 which could otherwise be carrying revenue earning traffic Similarly if the main network Gateway NE and the Island Gateway NE each have VC 12 trail termination traffic in...

Page 40: ...in network and tail end in a remote island of that network 3 7 IP Management of Third Party Co Located Equipment The management of SDH equipment is usually achieved using OSI protocols The situation can arise in networks where third party equipment uses IP protocols for its management This situation is very often resolved by creating a completely separate Data Communications Network DCN for this I...

Page 41: ...Product Description 221 02 ZAP 701 25 1 Rev C 2006 08 04 Ericsson AB 2006 03PHB00004AAV CUA Commercial in confidence 41 136 3 8 Tandem Connection Monitoring TCM All SDH cards support TCM sub layer performance monitoring full TCM ...

Page 42: ...Marconi OMS 1200 Technical Product Description 221 02 ZAP 701 25 1 Rev C 2006 08 04 Ericsson AB 2006 03PHB00004AAV CUA Commercial in confidence 42 136 Blank Page ...

Page 43: ...may be employed for both these applications 1 1 Multiplex Section Protection MSP Sub Network Connection Protection SNCP or Multiplex Section Shared Protection MS SPRING Figure 4 1 Network Configurations OMS1200 family OMS1200 family OMS1200 family OMS1200 family OMS1200 family OMS1200 family The OMS 1200 can also be deployed in mobile radio networks for the collection and consolidation of traffic ...

Page 44: ...MS 1200 Ring 4 1 3 Broadcast Broadcast supports point to multi point unidirectional transmission of circuits One of the main applications is in the delivery of video and television signals There are two basic configurations for broadcast Firstly where a signal is received and passed through to a line port whilst being switched to a tributary port Secondly where the signal is received at a line por...

Page 45: ...lexible leased line resized via Link Capacity Adjustment Scheme LCAS For each connection one VC group is used Figure 4 4 Ethernet Private Line SDH Network Flexible assignment of link bandwidth VC x nv Flexible adjustment bandwidth in service using LCAS Traffic flow maintained on failure of an SDH VC within the link OMS 1200 FastE GbE End equipment Underlying SDH protection mechanisms retained Mapp...

Page 46: ...s the OMS 1260 is only designed to support Comms Aux transport via tributary cards in Slots 4 and 5 only these have internal system OH busses There is no comms support via Slots 1 2 or 3 The STM 4 16 core cards have overhead bus connections to all seven generic tributary slots Legacy Dual STM 1 Electrical Tributaries These cards only support comms on Port 1 No comms channels are available on Port ...

Page 47: ... is attained with the configuration shown in Table 5 1 with a power supply voltage of 55Vdc and high inlet air temperature causing the fans to run at full speed Table 5 1 OMS 1200 Power Consumption Cards Unit configuration OMS 1240 OMS 1260 STM 4 16 Core CCU 25W 25W STM 4 16 Core 22W 22W Power LTU 0 5W 0 5W Generic power LTU 1 7 2W 5 3W Generic power LTU 2 7 2W 5 3W Generic power LTU 3 5 3W Generi...

Page 48: ...Marconi OMS 1200 Technical Product Description 221 02 ZAP 701 25 1 Rev C 2006 08 04 Ericsson AB 2006 03PHB00004AAV CUA Commercial in confidence 48 136 Blank Page ...

Page 49: ... clock external outputs and all SDH line tributary outputs are synchronised to the highly stable internal oscillator on the Core Card Only configuration options described in Sections 6 3 6 10 and 6 12 have any effect in Freerun mode Note Default Freerun 6 2 2 SETG Timing In SETG Mode the NE is capable of deriving timing from a choice of inputs Incoming STM N line interfaces Tributary ports either ...

Page 50: ...3 1 Destination ID The destination ID for each STM n can be configured This is a text string of up to 52 characters The SSMB associated with the interface can also be overwritten Note Default card and port ID e g Line East A 6 4 Revertive Non revertive Operation The equipment may be configured for revertive or non revertive operation Note Default Revertive 6 5 Wait to Restore Period A wait to rest...

Page 51: ...line recovered clock Yes Yes Core 1 8 1 SDH line recovered clock Yes Yes Ext Trib clock Yes System clock Yes SASE Equipment clock Yes Table 6 3 OMS1260 4 Sync Priority Options Source Equipment Clock External Output Core 1 26 1 SDH line recovered clock West A Yes Yes Core 1 26 2 SDH line recovered clock East A Yes Yes Core 1 25 1 SDH line recovered clock West B Yes Yes Core 1 25 2 SDH line recovere...

Page 52: ...ted as timing sources in the priority tables Note Default None selected 6 7 2 OMS1260 Tributary Selection One of the ports from the five generic tributary slots in OMS1260 4 or one of the ports from the seven generic tributary slots in OMS1260 16 may be chosen as the tributary synchronisation input Only configured cards may be selected as timing sources in the priority tables Note Note Default Non...

Page 53: ... Note Default Ext 1 Clock Quality Level 1 PRC SSMB 0010 Ext 2 Clock Quality Level 1 PRC SSMB 0010 6 10 2 External Input SSMB position The SSMB position can to be specified in positions 4 5 6 7 or 8 in external 2Mbit s framed SSMB mode The quality level is determined from the received SSMB The operator can also configure a fixed SSMB value and the received SSMB value is ignored Note Default bit pos...

Page 54: ...SMB position can to be specified in positions 4 5 6 7 or 8 in external 2Mbit s framed SSMB mode Note Default bit position 8 6 11 2 External Output off State The external timing output will switch off when the source quality level falls below a certain threshold or all sources are unavailable There are three types of off state which can be configured High impedance 0V DC offset Note Default 0V ...

Page 55: ...16 Undefined 7 0 1 1 0 16 Undefined 8 0 1 1 1 16 Undefined 9 1 0 0 0 3 Traceable to G 812 local clock 10 1 0 0 1 16 Undefined 11 1 0 1 0 16 Undefined 12 1 0 1 1 4 Traceable to G 813 clock 13 1 1 0 0 16 Undefined 14 1 1 0 1 16 Undefined 15 1 1 1 0 16 Undefined 16 1 1 1 1 16 Not to be used for synchronisation Note Default 1011 G 813 6 13 SSMB Code to Quality Level Assignment Quality levels between 1...

Page 56: ...nical Product Description 221 02 ZAP 701 25 1 Rev C 2006 08 04 Ericsson AB 2006 03PHB00004AAV CUA Commercial in confidence 56 136 SASE Mode ESM Input 1 ESM Input 2 ESM Inputs 1 and 2 Disabled Note Default SASE Mode Disabled ...

Page 57: ...om SDH input interface to SDH output interface It also fails to indicate that the synchronisation source has been looped back This could in certain situations lead to the creation of a timing loop in the network These problems lead to the introduction of the SASE Mode operation 6 14 2 SASE Mode In SASE Mode the OMS 1200 overwrites the outgoing STM n SSMB in the direction that provided the T4 sourc...

Page 58: ... output will be squelched and this is signalled internally to the T3 input using the Squelch control line This causes the T3 input to ignore the source information received from T4 and instead it uses the operator configured SSMB value for transmission on STM n interfaces 6 14 4 Enhanced SASE Mode on External 1 2 The SASE will enter holdover mode G 812 if it rejects the timing source from the T4 o...

Page 59: ...mum Quality Holdover 2 1 Priority for STM N sources Key Priority for T4 sources 2 Priority for SSU outputs 1 T3 Input SSMB T3EXT2 2 degraded quality STM n interface 6 15 2Mbit s De Synchroniser Bandwidth The jitter bandwidth for the 2Mbit s through data is determined by the bit justification bandwidth of the de synchroniser Either normal or narrow bandwidth can be configured on an equipment basis ...

Page 60: ...d PDH tributary cards are configured as part of the selection mechanism for the equipment 6 17 4 Synchronisation Configuration on Reset The following default configuration occurs for each card on power up of the shelf or on insertion of a card into a powered shelf The controller function restores the configuration contained in non volatile memory on the SMC Until the configuration is restored or b...

Page 61: ... 7 2 General Protection Information and Architecture Rules The same protection schemes apply in OMS 1200 family equipment but because of the increased size of the OMS 1260 rack and available bandwidth slots the position of the protection cards must be located as described 7 2 1 OMS 1240 Protection Rules 7 2 1 1 Core and Core Tributary Protection The OMS 1240 provides two slots for Core cards desig...

Page 62: ...ptions Conf ig Core A Core B Core TRIB A Core TRIB B Unprotect ed Core Unprotect ed 2M Core Trib A AAK or ABC Protected Core Unprotect ed 2M Core Trib B ABC Protected Core Protected 2M Core Trib123 C AAK or ABC AAK or ABC Notes 1 When protecting the Core if Core TRIB A is an AAK variant then Core TRIB B must be installed and can be either variant 2 A Core TRIB card cannot function without its asso...

Page 63: ...ent of Core and Core Tributary protection 7 2 2 OMS 1260 Protection Rules 7 2 2 1 Core Cards The core card in slot S1_07 may have a protection card in slot S1_06 Trib card protection and Core card protection are independent it is therefore possible to have protected core and unprotected TRIBs and vice versa Table 7 3 Slot Position Rules for OMS 1260 Core Card and Protection Options Slot S1_ 01 02 ...

Page 64: ...e 7 1 4 16 Core Ring MS SPRING Protection 4 2 1 3 STM 4 MS SPRING OMS1200 STM4 16 WORKER PROTECTION WORKER PROTECTION WORKER WORKER PROTECTION PROTECTION AU1 AU1 AU2 AU3 AU4 AU2 AU3 AU4 A B In this example shown in Figure 7 1 the ring is protected using MS Spring In this case Core A Line and Core B line provide both worker traffic and protection traffic Note This configuration can only be achieved...

Page 65: ...e 65 136 1 4 Core Ring MSP line protection Figure 7 2 4 16 Core Ring MSP Line Protection STM 4 16 MSP terminal OMS1200 STM4 16 A B LINE LINE In this example shown in Figure 7 2 MSP is configured for the line interfaces Core B then acts as a protection card and does not carry normal worker traffic MSP can only be used for Terminal applications ...

Page 66: ...l worker traffic 7 2 2 2 Tributary Cards In addition to the rules in Section 7 2 2 1 the following slot positions must apply where generic tributary cards are used Generic tributary cards are located in numerically adjacent slots with the protection card in the next available slot to the right jumping the core and protection cards and the blank slot Generic tributary cards can be arranged in group...

Page 67: ... 1260 generic tributary cards can be organised in groups where each group has a protection card See Table 7 4 Table 7 4 Slot Position Rules for OMS 1260 Generic Tributary Cards and Protection Options Slot S1_ 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 Single group generic tributary card protection examples See notes below 1 U U U U U U U 2 W P N N N N N 3 W W W W W W P 4 W W P W W W P 5 W P W P ...

Page 68: ...3_17 Generic Trib 6 S1_13 Generic Trib 6 PSU LTU S3_18 Generic Trib 7 S1_14 Generic Trib 7 PSU LTU S3_19 Note In each tributary group it is not possible to fit the 2M tributary card and the generic tributary card at the same time This is indicated by the dotted line Table 7 6 Slot Equipping rules for 63x2M Unbalanced LTU 02HAM 00003 AAL 2M LTU 1 2M LTU 2 2M LTU 3 2M LTU 4 S3_ 01 S3_ 02 S3_ 03 S3_ ...

Page 69: ...tion SNCP PDH Trail PDH Tributary Port Protection Two Fibre MS SPRING is available for OME1240 and OMS 1260 fitted with STM 4 16 Core cards SMA Equipment Level Protection Schemes SDH PDH ETA Tributary Interface Card Protection Core Card Protection Network level protection schemes protect against failure of equipment and line plant external to the SMA for example SNC protection These schemes are in...

Page 70: ...ion are used to describe different traffic protection behaviour when worker and protection paths are set up on the same core card refer to Figure 7 4 or on different core cards refer to Figure 7 6 respectively Figure 7 4 Intra Card Protection Optics TSHOPP Switch Core Card A SCP ASIC Tx W Rx W Rx Tx Tx P Rx P Figure 7 5 Inter Card Protection Optics TSHOPP Switch Optics TSHOPP Switch Core Card A Co...

Page 71: ...or pairs of tributary ports but not pairs consisting of both a line and a tributary port It is possible to configure MSP between STM 1 optical and electrical interface ports STM 4 optical interface ports and STM 16 optical interface ports It is not possible to configure MSP on line ports of tributary cards that are included in a 1 n card protection group An MSP pair must have the same STM n rates ...

Page 72: ... 72 136 Figure 7 6 1 1 STM n Link Protection Note References to line cards apply to the TSHOPP and optical line modules of the core cards and references to the switch cards apply to the switch function of the core cards Each STM 1 4 core card provides up to two STM 1 4 line interfaces These may all operate as unprotected ports on a hubbing NE ...

Page 73: ...ion on Core Card B and vice versa One protection pair two protection pairs or none STM 16 4 core cards only provide one SDH line interface function therefore if this needs MSP protection configuration then two core cards have to be installed with inter core card MSP protection pairing 7 4 1 OMS 1200 STM1 4 Core Card STM 1 4 core cards provide two STM 1 4 line interfaces These may all be configured...

Page 74: ...OMS 1200 STM4 16 Core Card STM 4 16 core cards provide STM 4 16 line interfaces These can be configured to operate as unprotected ports or as a protected Terminal Mux with MSP When two Core Cards are fitted the second core card automatically provides equipment level protection against card failure The second core can also be used to provide protection for the SDH line interface functions utilising...

Page 75: ...n section basis at the LCT LCTS 7 4 3 1 ITU T ETSI Standard K1 K2 Protocols The K1 K2 protocol described in the standards referred to above is used to send requests for switching This is used in 1 1 bi directional and unidirectional modes The 1 1 K1 K2 protocol mechanism compatible with 1 N network architectures is used The tail end duplicates traffic and sends the K1 and K2 to the far end informi...

Page 76: ...its 1 4 of K2 bytes sent at both ends of the section are set to 0001 to indicate that the selector is released and receiving traffic from the working section The protection logic of each end determines the highest priority request that is active This may be a remote request received via the K1 byte or a local request condition state or switch request of the local MSP function The protection logic ...

Page 77: ...rtive mode of operation is designed to prevent unnecessary disturbances to traffic which occur when a revertive mechanism switches back Note Although the aim is to make protection switching of channels in an SMA hitless this may not always be guaranteed For 1 1 protection there is no conceptual distinction between the channels in non revertive mode and traffic switching between them takes place in...

Page 78: ...ossible to change and re enter it If Protection Section is failed Mode Mismatch is disabled Note It is necessary to check the operating modes of the multiplexers at both ends of the link before re entering the mode The second condition under which the mode can change is in response to a locally detected failure of the protection channel Since the signalling for bi directional working is carried ov...

Page 79: ...ll TU Ns resulting in AIS being transmitted on all ports cross connected to the failed interface When a card is replaced into a configured slot the controller function checks the validity of the card and after downloading the configuration database sends a Clear Slot Fail message to the switch The controller derived interface failure is then removed and provided there is no locally detected interf...

Page 80: ...riteria for setting the SD Flag can either be handled within the protection configuration applications or within the section path maintenance configuration applications of the SMA events and traffic connection management You are able to configure degraded path performance fault reporting on a per section basis The configurations include the following Fault Report Disabled Fault Report based on equ...

Page 81: ...ge in switch state then it is translated into a message which is compatible with the K1 byte message set Siemens or ITU T ETSI standard for transmission to the remote multiplexer Each of the operator entered events used for control of switching is described below The names of the commands are those seen at the LCT The commands in square brackets are the equivalent commands of the K1 message set Th...

Page 82: ...ds the in traffic LEDs are always lit since each separate port may or may not be in protection and possibly with different protection card pairings 7 4 9 Forced Switch to Protection Forced Switch worker channel Causes traffic to switch to or be maintained on the protection channel unless a higher priority switch state is in effect or an SF condition exists on the protection section This command el...

Page 83: ...ink and are received via the K1 byte in accordance with the protocol detailed in G 783 and the Siemens protocol The Multiplexer Controller is capable of interrogating the switch for current settings This ensures that on controller reset no states are changed The remote events are Forced Switch Worker Channel Forced Switch Protection Channel The above events are derived from operator requests enter...

Page 84: ...o maintain traffic on the protection channel even though the working channel has recovered See Section 7 4 17 2 for a description of Do Not Revert 7 4 16 No Request The idle condition received when neither a request nor acknowledgement is being transmitted by the remote multiplexer 7 4 17 Local WTR and Do Not Revert States An SMA enters either the Wait to Restore or Do Not Revert state upon recove...

Page 85: ...c connections can only be in one of two states according to the position of the selector switch refer to Table 7 12 These states are receiving traffic from the working channel and receiving traffic from the protection channel The state that the switch is in at any time is governed by the indications which are active at that time These indications comprise local line failure flags operator entered ...

Page 86: ... selector released Table 7 9 MSP Switch Indications Priority Indication Received Note 1 Selected Channel 1 Forced Switch Protection Working 2 Signal Fail Protection Working 3 Forced Switch Worker Channel Protection Note 3 4 Signal Fail Worker Channel Protection Note 3 5 Signal Degrade Protection Working 6 Signal Degrade Worker Channel Protection Note 3 9 Wait to Restore Worker Channel Notes 2 4 Pr...

Page 87: ... terminal or from the EM See also the LCT LCTS Operating Procedures handbook For each STM n section to be protected consider 1 STM n section to be protected and protection section MSP is enabled disabled by virtue of configuring deconfiguring the protection and protected section In the case of line section West East A or B line STM n must be specified In the case of STM 1 tributary the number of t...

Page 88: ...ndard this time is defined as the period between an SF or SD flag being set by an STM n card and completion of the switching action this includes the operation of the local tail end selector as well as the transmitted K1 K2 bytes stabilising to a steady state In bi directional operation when using the ITU T ETSI standard protocol the switching time is as for unidirectional operation except that th...

Page 89: ... 2 and VC 12 In an SDH network traffic is mapped into a VC container and is transported across the network on a VC trail A VC trail exists from the NE at which the VC termination is sourced across to the NE at which that VC termination is sinked Any VC trail may only be connected through these two NEs or more commonly it may be cross connected through various NEs on route between the source and si...

Page 90: ...ical to unidirectional revertive mode except that traffic is not switched back to the working channel from the protection channel when the former recovers from a failure condition This prevents the disturbance to traffic which otherwise occurs when the selector is operated switching of VCs is non hitless Automatic protection switching is therefore symmetrical between the two channels in non revert...

Page 91: ...path layer fault SNCP switching can be triggered from failures detected at MS and HO path layers SNC I monitoring as well as failures detected at the specific protected VC path layer SNC N monitoring The persistency configuration is applied to the protection switch controller on the core unit It applies a hold off to autonomous protection switching actions from received SF SD signalling flag reque...

Page 92: ...tiplexed layers of the incoming bearer STM n signal in which the protected VC is contained These represent SNC I server layer inherent monitoring Additionally the flag is declared and signalled if failures are detected on the incoming protected VC path layer These represent SNC N client layer non intrusive monitoring by the VC POM functions on the bearer SDH interface units These functions are aut...

Page 93: ...race Mismatch LP TIM SNC N YES only LO VC layer SNCP In general enabling disabling criteria from the VC POM functions which set the SF flag are not handled within the protection configuration applications Enabling disabling criteria for setting the SF flag are indirectly handled as part of the VC path maintenance configuration applications of the SMA events management and VC connection management ...

Page 94: ...e attributes Table 7 11 Fault Criteria for Setting SNCP SD Flags Fault Type Protection Class Enable Disable Application Notes HO Path Signal Degrade HP DEG SNC N YES only HO VC layer SNCP HO Path Unacceptable Short term Errors HP DEG SNC N YES only HO VC layer SNCP LO Path Signal Degrade LP DEG SNC N YES only LO VC layer SNCP LO Path Unacceptable Short term Errors LP DEG SNC N YES only LO VC layer...

Page 95: ...ings of protection to ensure the states are not changed 7 5 3 2 Operator Entered Commands The SNC protection switching mechanism also receives operator inputs An operator enters these commands via the LCT or NMI For each operator entered event a brief description of the required system behaviour is given below The names of the commands are those that are specified for use on the Local terminal In ...

Page 96: ...ain traffic on protection channel These are derived from operator requests entered at the remote end or from the local failure conditions detected by the remote end 7 5 3 4 Wait to Restore and Non Revertive Mode No Request States The SMA enters either Wait to Restore or Non revertive mode No Request state when the working channel recovers from a failure The wait to restore state is entered automat...

Page 97: ...r commands require selection from the protection channel On power up the protection switching control mechanism does not allow the selection of the protection channel with the Wait to Restore or No Request Traffic on Protection states active 7 5 4 Protection Switching Control for SNCP 7 5 4 1 Protection Switching Operation For a protected SNC the traffic selector can be in only one of two possible...

Page 98: ...ve mode only 7 5 4 2 Operator Commands for SNC Protection Configuration Before the protection switching mechanism can be controlled you must configure the different parameters related to the type of protection for each protected path You enter these commands via the local terminal or from the EM For each SNC to be protected 1 Connection to be protected and protection connection It is possible to a...

Page 99: ...e maximum protection switching times for VC channels Unidirectional mode 50 ms Bi directional mode 100 ms These times are defined from the point at which a local failure is detected or a remote request is received to the point at which traffic is restored at the appropriate tributary card output port after selection of the other VC channel The changeover time of the receive selector is less than 2...

Page 100: ...TSNCP TCM functions allow you to monitor the performance of a VC path across the specific segment which lies within your administrative domain This is known as sub layer monitoring It does not affect the ability for normal end to end VC path monitoring across the whole network s 7 6 2 Modes of Operation for TSNCP The operator configurable modes of operation including TSNCP persistency are as descr...

Page 101: ...ags are generated by outputs from the RST MST MSA HPA HPT functions the tandem VC TCT TCM functions and the VC POM functions These functions all reside on the bearer SDH interface units The TCT TCM functions are autonomously enabled when you configure a protected tandem VC SNC Depending on the network applications of TSNCP these new fault types can either add to the list of fault types or provide ...

Page 102: ...NCP LO Path Trace Mismatch LP TIM SNC N YES only LO VC layer SNCP LO Path VC AIS LP VC AIS SNC N YES only LO VC layer SNCP when set up on a tandem VC trail HO TC Loss of Tandem Connection HTC LTC SNC S YES only HO tandem VC layer TSNCP HO TC VC AIS HTC incAIS SNC S YES only HO tandem VC layer TSNCP HO TC Unequipped HTC UNEQ SNC S YES only HO tandem VC layer TSNCP HO TC Trace Mismatch HTC TIM SNC S...

Page 103: ...TSNCP 7 6 3 2 Locally Entered Operator Switching Requests These Forced Switch Manual Switch Clear requests are as described for VC trail SNCP in Section 7 5 3 2 above 7 6 3 3 Remote Multiplexer Switching Requests Bi directional Switching Mode The TSNCP protection switch controller responds to remote requests from the SMA at the far end of the protected tandem VC trail when operating in bi directio...

Page 104: ...rt It is issued to instruct the remote protection switch controller to maintain its switch selector on the protection trail even though a working trail failure has recovered 12 No Request Protection Channel This is the idle condition signalled when neither a higher priority request nor acknowledgement is active However after a switch to protection in Non revertive mode when idle conditions subsequ...

Page 105: ...corrupted or bi directional ganged switching is not occurring at the two SMAs involved or the TSNCP operating modes are not identically configured at each of the two SMAs 7 6 5 Protection State Reports The following lists identify the various states of the TSNCP protection switch controller and which are reported 1 TSNCP States Locally Initiated Only No Request Traffic on Worker No Request Traffic...

Page 106: ...rotecting failure removal of line interfaces can only be achieved by independently setting up linear MSP protection on pairs of line interfaces across A and B Core Cards Alternatively or inclusively path layer SNCP protection of traffic would be set up using pairs of SDH line interface bearers across A and B Core Cards In summary configuring core card core tributary protection linear MSP and or pa...

Page 107: ... SDMs which the CCU controller embeds into every VC traffic connection across the core switch planes Traffic cards and modules report switchplane failures to the CCU controller and it initiates master slave changeover Since the CCU function is integrated onto Core Card A failure of a core card also means failure of the CCU There is therefore a mechanism to allow a current slave core card to autono...

Page 108: ... even if a fault on that unit is detected If both core units fail simultaneously no switchover occurs and the Multiplexer Controller is informed of the failures 7 7 2 Modes of Operation It is possible to commission the system with either one or two core cards Equipping options of core cards and their SDH line interface modules are shown in Figure 7 9 Figure 7 9 STM 1 4 Core Card Equipping Options ...

Page 109: ...th core units This indicates that removal of a card of either core unit may disrupt traffic Note Although one core is not carrying traffic the In traffic LED is lit This indicates that both core cards are available to pass traffic and it is unsafe to remove either core card 7 7 2 1 Reconfiguration for Protected Operation To add core unit protection to a currently unprotected traffic carrying syste...

Page 110: ...he other core unit using the Local Terminal by instructing a Forced Switch to the other core unit Note 1 and 2 Note 1 Situation 3 above may cause errors during the switching over of the selected switch unit and should be avoided if possible Note 2 To restore core card protection capability you must issue a Clear Forced Switch command on replacement of the switch unit If a core card is removed on b...

Page 111: ...nce Check of Diagnostic Message Failure and protection switching is in accordance with the priorities in Section 7 5 3 Failure of Parity Checks Parity bits are calculated at the sender port and inserted into the diagnostic messages such that even parity is maintained in each channel At the destination port the parity of each channel is calculated again and any parity errors generate an alarm The p...

Page 112: ...nce check is carried out on such conditions Persistence Check of Diagnostic Message Failure In cases of diagnostic message failure a persistence is performed to prevent spurious switching during transient conditions e g MSP switching This check takes the form of a threshold on the number of permissible consecutive mismatches of the diagnostic messages A hardware persistence is applied independentl...

Page 113: ... where core tributary function protection is also configured Peripheral traffic cards modules can autonomously switch between Core Card A B Switch functions Failures are determined by monitoring for traffic signal clock failures and errors in Switch Diagnostics Messages SDMs which the CCU Controller embeds into every VC traffic connection across the Core Switchplanes Configuration of SDM parameter...

Page 114: ...itch applied to it subsequently fails no protection switching actions will be invoked 7 7 4 3 New Switching Criteria The following criteria relate to legacy SMA products and OMS 1200 products They take account of the need for peripheral traffic interface cards to protection switch between the pSTM 1 traffic and timing signals from both core cards They also account for In the case of OMS 1240 produ...

Page 115: ... slave status It effects a master slave switchover sequence just as it would if it received a master status interrupt from the CCU controller via the hardware control lines mentioned above If a core card is currently in master status clock failure detection of its slave partner does not invoke any autonomous master slave switching actions this to the extent that no spurious switch actions occur up...

Page 116: ...sequently issues the equivalent instructions assuming this repeat is not hardware or traffic affecting After initiating master status takeover it ignores the CCU controller if it subsequently issues the equivalent instructions It does however make sure that controller instructions resulting from operator Forced Switch commands are not ignored 7 7 5 Operator Entered Commands You may make the follow...

Page 117: ... received from the Multiplexer Controller overrides all locally detected conditions In case of two or more detected failures with at least one failure of each core indicated the selected core is chosen according to the first failure indication received by the core unit Any subsequent failure detections will not cause the destination ports to switch to the unit that was first detected as having fai...

Page 118: ... fails or is removed Protection switching times for these schemes are stated earlier in this section In the OMS 1240 only where core cards are configured with core tributary card functions master slave protection switching on the tributaries will affect 2M PDH traffic for up to 50ms 7 8 Tributary Card Protection Schemes In OMS 1240 and OMS 1260 tributary card protection provides equipment level pr...

Page 119: ...ingle LTU slot is available for each generic tributary card for example a PDH 34M tributary card LTU supports all three traffic I O ports Direct driving of the LTU control lines from the traffic processor of the core card is supported in order to achieve fast protection switching 50ms 7 8 1 3 Generic Tributary Card Protection Configuration Rules For tributary card protection to become available yo...

Page 120: ...ailed A subsequent failure of the protection card or any of the other workers does not cause traffic to revert The in traffic indicator on the worker is extinguished when a forced switch is in effect Clear This clears the Lockout of Protection and Forced Switch to Protection operator commands It causes traffic if switched to protection to be switched back to the worker Trigger Restoration In autom...

Page 121: ...d in Tributary Slot S1 01 and the protection card in Tributary Slot S1_02 7 8 4 2 Modes of Operation OMS 1240 Only Tributary cards may operate with or without 1 1 protection Tributary cards in slot S1_02 only operate as an unprotected card or as a protection card Switching traffic from the protected card to the protection card can be automatic under the Multiplexer Controller control with switchin...

Page 122: ... PDH Port Protection To improve the availability of the PDH traffic signal input and output ports may be duplicated The duplicated traffic signal may be on the same tributary card or on different tributary cards In the case of protection for 2M signals the signal may be embedded in a 34M aggregate signal received by a 34M transmux card On the OMS 1240 port protection is available between any two 2...

Page 123: ...n is also de activated if a higher priority condition is received during the timer period You may configure the timer from 0 to 30 minutes in one minute 5 second steps You can configure the WTR period globally and on an individual port basis for protected ports The default value is 10 minutes Note You arel only able to retrieve WTR values from the NE on an individual port basis The Do not Revert s...

Page 124: ...if the following failures are detected on the 34M aggregate signal Loss of tributary signal EBER this is calculated only on 34M Frame Alignment Word errors AIS A failure of Type 5 causes a Signal Degrade SD flag to be inserted into the internal traffic signal frame overhead from PDH card to switch unit for the appropriate PDH trib port In the case of a 2M signal contained in an aggregate 34M trans...

Page 125: ...eparate configurable thresholds are provided for SES performance monitoring and DEGS events handling Note You can configure the signal degrade fault type to work on BIP BERs or CDEGS 7 9 2 2 Priority of Failure Conditions The PDH port selected as the source of selected traffic is as shown in Table 7 18 Table 7 18 PDH Port Priority of Failure Conditions Priority Switch State Selected Channel 1 Forc...

Page 126: ... protected input ports Any decision regarding the quality of the traffic at the output ports must be made by equipment external to the OMS 1240 7 9 3 2 Operator Commands for PDH Port Protection Before the PDH port protection mechanism can be controlled you must configure the different related parameters You enter these commands via the local terminal or from the Element Manager 1 For each port to ...

Page 127: ... selects incoming traffic from the port with the highest quality and broadcasts outgoing traffic on both ports 7 10 MULTIPLEX SECTION SHARED PROTECTION MS SPRING 7 10 1 Introduction MS Spring schemes provide SDH trail protection by re routing the AU 4 payloads of aggregate STM n signals in the event of a failure detected on a particular span or spans of the Ring The schemes provide protection agai...

Page 128: ... superficial actions shall be reported to Element Manager for operator checking No Bridge and Switch actions are effected and working traffic is not affected Note With Exercise test routines the MSSPRING Managers of the two involved adjacent Nodes simulate a Ring or Span switch Each Manager shall check the responses from the other and the detecting Node s shall report an MSSPRING Protocol Fail ala...

Page 129: ...ed This occurs if the protection channels are not in an SD condition and are not satisfying an equal or higher priority bridge request including failure of the protection channels Manual Switch to Protection Span This command switches the traffic from the working channels to the protection channels for the same span over which the command is initiated This occurs if the protection channels are not...

Page 130: ...ching is always bi directional A Source node will either detect local failures for autonomous switching or receive external operator commands and will signal to the destination node via bi directional APS signalling to effect parallel switching actions The EM or an LCT operator downloads a Ring Map to the NE Ring Maps are required to provide NE IDs and the orientation of NEs within the Ring for K1...

Page 131: ... supervisory alarm In this way when VC Tandem VC trail trace mismatch alarms are detected in the Network due to actual misconnections there is an indication of the potential cause from the MS Spring switching Nodes 7 11 7 Path of TCM Trail Trace used for Squelch of Mis Connected Traffic With multiple Ring Switch handling by NEs in a Ring network there is the potential for traffic misconnections Th...

Page 132: ...mmy Tandem Connection Termination functions on the MS SPRING Nodes and squelching from real Tandem VC Trail Trace Mismatch detection In parallel maintenance functions for the end to end Tandem VC trails will be provisioned by setting up PSEUDO Tandem Connection Termination functions on both the TCM Boundary Nodes and the Tandem trail termination Nodes as required 7 12 Network Level Protection Swit...

Page 133: ... away from the failure Nodes F E and D provide pass through connections for the protected traffic to complete a path to Node C In response to the Bridge at Node B Node C Switches the protected traffic from East back onto Worker channels East bound Node D now receives the working traffic from West as if no failure had occurred In the reverse direction of transmission with Node C also detecting fail...

Page 134: ...ION W O R K E R P R O T E C T I O N b FAILED TRANSMISSION 2 FIBRE MS SPRING RING PROTECTION SWITCH NODE A NODE B NODE C NODE F NODE E NODE D WORKER WORKER W O R K PROTECTION P R O T E C PROTECTION WORKER WORKER PROTECTION PROTECTION W O R K P R O T E C X Switching Nodes Complete span failure Transport circuit X Transport circuit X Transport circuit Y Transport circuit Y Transport circuit X Transpo...

Page 135: ...it Y is unaffected by the protection switching Note As both Worker and Protection sections are transported on the same physical medium there are no Span Switch options in 2 Fibre Rings Figure 7 13 2 Fibre MS SPRING MultiRing Protection Switch Concept NODE A NODE B NODE C a NORMALTRANSMISSION NODE F NODE E NODE D WORKER WORKER WORKER PROTECTION PROTECTION PROTECTION WORKER WORKER PROTECTION PROTECT...

Page 136: ...ncept NODE A NODE B NODE C a NORMALTRANSMISSION NODE F NODE E NODE D WORKER WORKER W O R K PROTECTION P R O T E C PROTECTION WORKER WORKER PROTECTION PROTECTION W O R K E R P R O T E C T I O N b FAILEDTRANSMISSION Misconnection after Node Failure NODE A NODE B NODE C NODE F NODE E NODE D WORKER W O R K PROTECTION P R O T E C PROTECTION WORKER PROTECTION PROTECTION W O R K P R O T E C XNodeSwitched...

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