Huawei OptiX OSN 7500 Technical Manual Download

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OptiX OSN 7500
Technical Manual - System Description

6 Data Features

Huawei Technologies Proprietary

6-10

protection for each other.

Node 1

Outer ring control

Node 2

Node 3

Node 4

2.5 Gbit/s RPR

Outer ring data

Inner ring data

Inner ring control

Figure 6-9

RPR ring

Basic Functions

The EMR0 and EGR2 boards of the OptiX OSN 7500 support the resilient packet ring
defined by the IEEE 802.17 standard. Table 6-2 lists their functions.

Table 6-2

Functions of Ethernet boards supporting RPR

Board

Feature

EMR0

EGR2

Interface 1xGE+12xFE 2xGE

Service frame format

MPLS

JUMBO frame

Supported, 9600 bytes

Max. uplink bandwidth

2.5 Gbit/s

RPR bandwidth

VC-3, VC-3-2v, VC-4,
VC-4-Xv (X

≤

16)

VC-3, VC-3-2v, VC-4,
VC-4-Xv (X

≤

16)

Ethernet virtual private
line (EVPL)

Supported Supported

Ethernet virtual private
LAN (EVPLAN)

Supported Supported

MPLS

Supporting MPLS frame format, constructing EVPL service
and EVPLAN service

VLAN 4k

Summary of Contents for OptiX OSN 7500

Page 1: ...Huawei Technologies Proprietary HUAWEI OptiX OSN 7500 Intelligent Optical Switching System Technical Manual System Description V100R001 ...

Page 2: ...Version V100R001 BOM 31026684 Huawei Technologies Co Ltd provides customers with comprehensive technical support and service Please feel free to contact our local office or company headquarters Huawei Technologies Co Ltd Address Administration Building Huawei Technologies Co Ltd Bantian Longgang District Shenzhen P R China Postal Code 518129 Website http www huawei com Email support huawei com ...

Page 3: ...bridge Tellwin Inmedia VRP DOPRA iTELLIN HUAWEIOptiX C C08 iNET NETENGINE OptiX iSite U SYS iMUSE OpenEye Lansway SmartAX infoX TopEng are trademarks of Huawei Technologies Co Ltd All other trademarks and trade names mentioned in this manual are the property of their respective holders Notice The information in this document is subject to change without notice Every effort has been made in the pre...

Page 4: ...oprietary Summary of Updates This section provides the update history of this manual and introduces the contents of subsequent updates Update History Manual Version Notes T2 040284 20050308 C 1 10 Initial field trial release ...

Page 5: ...3 High Integration Design 2 3 2 2 Service 2 4 2 2 1 SDH PDH Service 2 4 2 2 2 Ethernet Services 2 4 2 2 3 ATM Services 2 4 2 2 4 SAN and Video Services 2 4 2 2 5 Built in WDM Technology 2 5 2 2 6 Service Access Capability 2 5 2 3 Interface 2 6 2 3 1 Service Interface 2 6 2 3 2 Administration Interface 2 7 2 4 Intelligent Features 2 8 2 5 Networking 2 9 2 6 Resilient Packet Ring 2 10 2 7 Protection...

Page 6: ...4 5 4 2 2 PDH Interface Unit 4 8 4 2 3 Data service Interface Unit 4 9 5 Software 5 1 5 1 Overview 5 1 5 2 Intelligent Software 5 2 5 3 NE Software 5 3 5 4 Board Software 5 4 5 5 NM System 5 4 6 Data Features 6 1 6 1 Ethernet Features 6 1 6 1 1 Function 6 1 6 1 2 Application 6 3 6 1 3 Protection 6 7 6 2 RPR Features 6 9 6 2 1 Function 6 9 6 2 2 Application 6 14 6 2 3 Protection 6 17 6 3 ATM Featur...

Page 7: ...ackup for the Cross Connect and Timing Unit 8 2 8 1 5 1 1 Backup for the SCC Unit 8 2 8 1 6 1 1 Backup for the Power Input Unit 8 2 8 1 7 1 N Protection for the 3 3 V Board Power Supply 8 3 8 1 8 Intelligent Fans 8 3 8 1 9 Abnormality Specific Board Protection 8 3 8 2 Network Level Protection 8 4 8 2 1 SDH Trail Protection 8 4 8 2 2 SDH SNCP 8 4 8 2 3 Protection for Interworking Service in Rings 8...

Page 8: ...lock Interface Type 10 8 10 3 2 Timing and Synchronization Performance 10 8 10 4 Transmission Performance 10 9 10 5 Power Consumption and Weight of Boards 10 9 10 6 Electromagnetic Compatibility 10 11 10 7 Environment Indexes 10 11 10 8 Environment Requirement 10 12 10 8 1 Environment for Storage 10 12 10 8 2 Environment for Transportation 10 14 10 8 3 Environment for Operation 10 17 A Compliant S...

Page 9: ...stem structure of the OptiX OSN 7500 5 1 Figure 5 2 Hierarchical structure of OSP software 5 2 Figure 5 3 Relationship between control plane and service plane 5 2 Figure 6 1 The EPL service 6 3 Figure 6 2 The EPL service with VLAN tag 6 4 Figure 6 3 The EVPL service with MPLS label 6 5 Figure 6 4 Layer 2 switching of Ethernet service 6 6 Figure 6 5 Application of EVPLAN service 6 7 Figure 6 6 LCAS...

Page 10: ...re 7 1 Networking protection for diamond level service 7 3 Figure 7 2 Protection for gold level service 7 4 Figure 7 3 Application of silver level service 7 4 Figure 7 4 Application of traffic engineering in the network 7 6 Figure 8 1 Fiber shared virtual path protection 8 5 Figure 8 2 MS shared optical path protection 8 6 Figure 8 3 Two lower speed lines share one higher speed line 8 6 Figure 8 4...

Page 11: ...3 Table 4 1 Boards and functions of the units 4 2 Table 4 2 Paired slots of the OptiX OSN 7500 4 5 Table 4 3 SDH processing boards and slots available 4 5 Table 4 4 SDH interface boards and their available slots 4 7 Table 4 5 Processing board slots and corresponding interface board slots 4 7 Table 4 6 PDH processing boards and available slots 4 8 Table 4 7 PDH interface boards and their available ...

Page 12: ...0 7 Table 10 10 Specifications of 155 Mbit s ATM optical interface of the OptiX OSN 7500 10 7 Table 10 11 Performance of the PDH electrical interface 10 8 Table 10 12 Clock features of the OptiX OSN 7500 10 8 Table 10 13 Timing and synchronization performance of the OptiX OSN 7500 10 8 Table 10 14 Transmission performance of the OptiX OSN 7500 10 9 Table 10 15 Power consumption and weight of board...

Page 13: ...ardware of the product including cabinet subrack power fan board and a variety of interfaces OptiX OSN 7500 Intelligent Optical Switching System Service Configuration Guide Introduces the way of data configuring on the T2000 OptiX OSN 7500 Intelligent Optical Switching System Installation Manual Guides the on site installation of the product and provides the information of the structural parts Opt...

Page 14: ... introduces the system software structure and functions of each part Chapter 6 Data Features This part introduces the data features including function list application and protection for Ethenet RPR and ATM Chapter 7 Intelligent Features This part introduces the intelligent features and applications of the OptiX OSN 7500 Chapter 8 Protection This part presents protection modes including equipment ...

Page 15: ...g conventions Symbol Conventions Symbol Description Warning A warning notice with this symbol indicates a risk of personal injury Caution A caution notice with this symbol indicates a risk to equipment damage or loss of data Important Note An important note notice with this symbol helps you avoid an undesirable situation or indicates important supplementary information Note A note notice with this...

Page 16: ...g platform It features large switching capacity with a maximum of 240 Gbit s higher order cross connection and 40 Gbit s lower order cross connection In addition the OptiX OSN 7500 provides intelligent features that are convenient and flexible to implement The intelligent features help the OptiX OSN 7500 to realize dynamic switching and allocation of bandwidth intelligent service routing and end t...

Page 17: ... intelligent optical core switching system with large capacity the OptiX OSN 7500 is mainly used at the backbone layer of the MAN to groom and transmit various services with different granules It is used with the OptiX OSN 9500 and OptiX OSN 3500 2500 1500 to provide a complete MAN solution Figure 1 2 shows how the OptiX OSN 7500 is applied in the transmission network ...

Page 18: ...500 OptiX OSN 1500 Convergence layer Access layer GSM CDMA WCDMA Ethernet DDN PSTN ATM OptiX OSN 7500 SAN OptiX OSN 3500 OptiX OSN 3500 Figure 1 2 Application of the OptiX OSN 7500 in the network The OptiX OSN 7500 is gradually used on the core convergence node of large cities the optical core switching OCS of medium and small cities and service grooming on provincial trunks ...

Page 19: ...ter introduces the functions of the OptiX OSN 7500 as follows Capacity Service Interface Intelligent features Networking Resilient packet ring Protection 2 1 Capacity 2 1 1 Cross Connect Capacity The OptiX OSN 7500 provides two types of SDH cross connect board GXCSA and GXCSB Table 2 1 shows their cross connect capacity ...

Page 20: ... GXCSA 240 Gbit s 1536 x 1536 VC 4 20 Gbit s 128 x 128 VC 4 equivalent to 8064 x 8064 VC 12 or 384 x 384 VC 3 200 Gbit s 1280 x 1280 VC 4 GXCSB 240 Gbit s 1536 x 1536 VC 4 40 Gbit s 256 x 256 VC 4 equivalent to 16128 x 16128 VC 12 or 768 x 768 VC 3 200 Gbit s 1280 x 1280 VC 4 2 1 2 Slots Access Capacity The OptiX OSN 7500 provides 22 service slots with the maximum access capacity of 200 Gbit s Fig...

Page 21: ...S L O T 2 3 AUX PIU A PIU B SLOT 32 SLOT 33 S L O T 3 4 S L O T 3 5 S L O T 3 6 S L O T 3 7 S L O T 3 8 EOW 5 Gbit s 5 Gbit s 5 Gbit s 5 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s 10 Gbit s A Primary B Standby Figure 2 1 Access capacity of service slots of the OptiX...

Page 22: ...Q1 support inverse multiplexing for ATM IMA The ADL4 IDL4 provides one STM 4 interface using a hot swappable LC optical module which can be S 4 1 and L 4 1 The ADQ1 IDQ1 provides four STM 1 interfaces using a hot swappable LC optical module which can be I 1 S 1 1 and L 1 1 2 2 4 SAN and Video Services The OptiX OSN 7500 provides the multi service transparent transmission processing board MST4 to a...

Page 23: ...n be used as an OTM to add drop two wavelengths and concatenation of two MR2A MR2Cs can function as an OTM to add drop four wavelengths The MR2A MR2C can work with the LWX to function as an OADM to add drop two wavelengths The LWX supports the conversion between client signaling wavelength and ITU T G 692 compliant standard wavelength and supports transparent transmission of signals Provide 3R fun...

Page 24: ...ted service 80 STM 16 FEC service 18 STM 4 standard or concatenated service 88 STM 1 standard service 280 STM 1 electrical service 64 E4 service 16 E3 DS3 service 24 E1 T1 service 252 Fast Ethernet FE service 168 Gigabit Ethernet GE service 44 STM 1 ATM service 88 STM 4 ATM service 22 ESCON FC50 service 88 FICON FC100 service 44 FC200 service 22 DVB ASI service 88 2 3 Interface 2 3 1 Service Inter...

Page 25: ...l interfaces support fixed wavelength output compliant with ITU T G 692 192 1THz 196 0THz PDH E1 DS1 E3 DS3 E4 electrical interfaces Ethernet 10 100Base TX 100Base FX 1000Base SX 1000Base LX 1000Base ZX ATM STM 1 optical interfaces I 1 S 1 1 L 1 1 STM 4 optical interfaces S 4 1 L 4 1 E3 interface IMA E1 interface SAN FC50 FC100 FICON FC200 ESCON service optical interfaces Video DVB ASI service opt...

Page 26: ...erial interface F f Orderwire interface One orderwire phone interface PHONE Two SDH network node interface NNI voice interfaces V1 V2 Two SDH network node interface NNI signaling interfaces multiplexed with two data interfaces for transparent transmission of serial asynchronous data 2 4 Intelligent Features Note The intelligent software system can be bundled with or seperated from the OptiX OSN 75...

Page 27: ...on Support span protection and end to end service protection improving the scalability of the network 2 5 Networking The OptiX OSN 7500 is a multiple add drop multiplexer MADM system It can process up to 160 embedded control channels ECC It supports complicated network topologies at STM 1 STM 4 STM 16 STM 64 level such as chain ring hub ring with chain tangent rings and intersecting rings as shown...

Page 28: ...gend MADM ADM TM 2 6 Resilient Packet Ring The resilient packet ring RPR is suitable for ring topology and able to restore services from broken fiber and link failure Its major features are Providing the topology automatic discovery function to reflect the network status in real time Supporting fair algorithm by configurable weight and supporting three service levels ...

Page 29: ...g board 1 1 TPS ATM IMA processing board 1 1 backup Cross connect timing unit 1 1 backup SCC unit 1 1 backup 48 V power interface board 1 1 backup 3 3 V board power supply 1 N centralized backup Note The OptiX OSN 7500 supports the coexistence of two TPS protection groups of different types 2 7 2 Network Level Protection In terms of network level protection the OptiX OSN 7500 supports four fiber t...

Page 30: ...g if a certain node is segregated due to failure of multiple nodes the traffic of different segments that occupies the same timeslot may contend for the timeslot and result in misconnection of traffic When there is extra traffic transmitted over the protection path even in the case of failure of a single node the traffic of the working path may contend for the timeslot on the protection path that ...

Page 31: ...eters of the cabinet Subrack structure 3 1 Cabinet The OptiX OSN 7500 can be installed in the ETSI cabinet Table 3 1 shows the technical parameters of the ETSI cabinet Figure 3 1 shows the outer view of the ETSI cabinet Table 3 1 Technical parameters of the ETSI cabinett Size mm Weight kg Number of configured subracks 600 W x 300 D x 2000 H 60 1 600 W x 600 D x 2000 H 64 1 600 W x 300 D x 2200 H 7...

Page 32: ...OptiX OSN 7500 Technical Manual System Description 3 Hardware Huawei Technologies Proprietary 3 14 Figure 3 1 Outer view of the ETSI cabinet ...

Page 33: ...95 mm D A single empty subrack weighs 20 kg The OptiX OSN 7500 provides two layer subracks composed of processing board area interface board area fan area and fiber routing area as shown in Figure 3 2 1 Processing board area in upper layer 2 Interface board area 3 Fan area 4 Processing board area in lower layer 5 Fiber routing area Figure 3 2 Structure of the OptiX OSN 7500 subrack ...

Page 34: ...7500 consists of SDH interface unit PDH interface unit data service Ethernet ATM SAN Video interface unit SDH cross connect matrix unit the core part synchronous timing unit SCC unit overhead processing unit power input unit and auxiliary interface unit Figure 4 1 shows the system architecture of the OptiX OSN 7500 and Figure 4 1 shows the boards and functions of each unit For details refer to Opt...

Page 35: ...d Function Processing board SF64 SL64 SLQ16 SF16 SL16 SLQ4 SLD4 SL4 SLH1 SLT1 SLQ1 SL1 SEP1 Interface board EU08 EU08A OU08 EU04 SDH interface unit Protection switching board TSB8 Access and process STM 1 STM 4 STM 16 STM 64 optical signals and STM 4c STM 16c STM 64c concatenated optical signals Access and process STM 16 STM 64 optical signals with FEC Access and process STM 1 electrical signals a...

Page 36: ...ide add drop multiplexing of any two adjacent wavelengths WDM unit LWX Implement conversion between client signaling wavelengths of any rate 10 Mbit s to 2 7 Gbit s NRZ code signal and those wavelengths complying with G 692 standard SDH cross connect matrix unit Synchronous timing unit GXCSA GXCSB Implement cross connection between the SDH and PDH data signals and provide the equipment with system...

Page 37: ...r STM 64 optical signals 4 2 Slot Figure 4 2 shows the slot layout of the OptiX OSN 7500 S L O T 1 S L O T 2 S L O T 3 S L O T 4 S L O T 5 S L O T 6 S L O T 7 S L O T 8 S L O T 9 S L O T 1 0 S L O T 1 1 S L O T 1 2 S L O T 1 3 S L O T 1 4 S L O T 1 5 S L O T 1 6 S L O T 1 8 XCS A XCS B FAN FAN FAN S L O T 1 7 Fiber routing Fiber routing S L O T 2 6 S L O T 2 7 S L O T 2 8 S L O T 2 9 S L O T 3 0 S...

Page 38: ...4 3 SDH processing boards and slots available Board Full name Slots available Outlet mode Interface type Connector SF64 STM 64 with FEC optical interface board slot 4 slot 8 slot 11 slot 16 slot 26 slot 31 Led out from the front panel Support fixed wavelength output and Ue 64 2c Ue 64 2d LC SL64 STM 64 optical interface board slot 3 slot 8 slot 11 slot 16 slot 26 slot 31 Led out from the front pan...

Page 39: ...erface board slot 1 slot 8 slot 11 slot 18 slot 26 slot 31 Led out from the front panel I 4 S 4 1 L 4 1 L 4 2 Ve 4 2 LC SLQ1 4 x STM 1 optical interface board slot 1 slot 8 slot 11 slot 18 slot 26 slot 31 Led out from the front panel I 1 S 1 1 L 1 1 L 1 2 Ve 1 2 LC SLH1 16 x STM 1 line processing board slot 2 slot 3 slot 17 slot 18 Led out from the interface board I 1 1 S 1 1 or 75 ohm STM 1 elect...

Page 40: ... same type They are displayed as SEP on the T2000 when used with the interface board or SEP1 when the signal is directly led out from the front panel Table 4 4 SDH interface boards and their available slots Board Full name Available slot Interface type Used with EU08 8 x STM 1 electrical interface board slot 19 slot 22 slot 35 slot 38 SMB SEP EU08A 8 x STM 1 electrical interface board slot 19 slot...

Page 41: ...ohm E3 DS3 electrical interface SMB PQ1 63 x E1 processing board slot 1 slot 3 slot 17 slot 18 Led out from the interface board 120 ohm and 75 ohm E1 interface DB44 PQM 63 x T1 E1 processing board slot 1 slot 3 slot 17 slot 18 Led out from the interface board 120 ohm E1 interface and 100 ohm T1 interface DB44 Table 4 7 PDH interface boards and their available slots Boa rd Full name Available slot ...

Page 42: ...slot 18 slot 26 slot 31 Led out from the front panel 1000BASE SX LX ZX LC EFS0 Fast Ethernet interface board with LAN switch slot 2 slot 3 slot 17 slot 18 Led out from the interface board 10 100BASE TX RJ 45 EFS4 4 port fast Ethernet interface board with LAN switch slot 1 slot 8 slot 11 slot 18 slot 26 slot 31 Led out from the front panel 10 100BASE TX RJ 45 EGT2 2 port Gigabit Ethernet transparen...

Page 43: ...C IDL4 1 x STM 4 ATM IMA service processing board slot 1 slot 8 slot 11 slot 18 slot 26 slot 31 Led out from the front panel S 4 1 L 4 1 LC IDQ1 4 x STM 1 ATM IMA service processing board slot 1 slot 8 slot 11 slot 18 slot 26 slot 31 Led out from the front panel I 1 S 1 1 L 1 1 LC MST4 4 x multi service transparent transmission line board slot 1 slot 8 slot 11 slot 18 slot 26 slot 31 Led out from ...

Page 44: ...able slots Board Full name Slots available Interface type Used with ETF8 8 x 10 100M Ethernet twisted pair interface board slot 19 slot 22 slot 35 slot 38 RJ 45 EFS0 EMR0 EFF8 8 x 10 100M Ethernet twisted pair interface board slot 19 slot 22 slot 35 slot 38 LC EFS0 EMR0 ETS8 8 x 10 100M Ethernet interface switching board slot 21 and slot 35 RJ 45 EFS0 ...

Page 45: ...re 5 1 Except the intelligent software system which can be operated independently the software system include three modules board software NE software and NM software respectively run on various boards SCC board and NM computer for corresponding functions Intelligent software OSP platform IP protocol stack NM software NE software Board software Figure 5 1 Software system structure of the OptiX OSN...

Page 46: ...cal structure of OSP software 5 2 Intelligent Software The intelligent software is represented in a control plane which is layered on top of the service plane The control plane interacts with the service plane to realize auto configuration of service and provide service protection based on user levels Figure 5 3 shows the relationship between the intelligent control plane and service plane Service...

Page 47: ...em of the OptiX OSN 7500 NE software is to manage public resources and provide support for the executive program It can provide an executive environment unrelated to processor hardware by segregating the application from the processor Network side NS module The NS module is between the communication module and equipment management module It converts the data format between the user operation side ...

Page 48: ...nd so on It can directly control the functional circuits in corresponding boards and implement ITU T compliant specific functions of the NE The board software can be classified into the following types line software cross connect software clock software and orderwire software 5 5 NM System The NM system implements a unified management over the optical transmission network and maintains all ION SDH...

Page 49: ...ty management NM user management NE user management NE login management NE login lockout NE setting lockout and local craft terminal LCT access control of the equipment Maintenance management Provide loopback board resetting board temperature threshold setting automatic laser shutdown ALS and optical fiber power detection and collect equipment data to help the maintenance personnel in troubleshoot...

Page 50: ...SN 7500 in terms of function application and protection 6 1 1 Function The OptiX OSN 7500 provides the Ethernet boards EFS4 EFS0 EGS2 EGT2 and EFT8 to meet different Ethernet service requirements Table 6 1 lists the basic functions of these boards Table 6 1 Functions of OptiX OSN 7500 Ethernet boards Feature Board EFS4 EFS0 EGS2 EGT2 EFT8 Interface 4 x FE 8 x FE 2 x GE 2 x GE 8 16 x FE Interface b...

Page 51: ...anning tree protocol RSTP Support STP and RSTP Not supported Multicast IGMP Snooping Supported Not supported Encapsulation format Generic framing procedure GFP High level data link control HDLC link access procedure SDH LAPS generic framing procedure GFP Mapping mode VC 12 VC 3 and virtual concatenation VC 3 VC 4 VC 12 VC 3 and virtual concatenation Link stat pass through LPT Supported Supported J...

Page 52: ...rnet service is provided with a perfect SDH self healing ring SHR protection scheme and its reliable transmission is thus guaranteed SHR 1 3 4 5 Traffic flow n NE 4 NE 1 NE 2 NE 3 2 Figure 6 1 The EPL service 2 EPL Service with VLAN Capability EPL services are isolated through VLAN tags during bandwidth sharing As shown in Figure 6 2 flow classification is performed for the Ethernet service accord...

Page 53: ...vice with VLAN tag 3 EVPL Service with MPLS Capability The OptiX OSN 7500 adopts the Martini modes to construct the multi protocol label switching MPLS Layer 2 VPN and provide EVPL service The EVPL service offers point to point connection and implements service convergence for users As shown in Figure 6 3 the system will search the Port Vlan ID table for the external label Tunnel and internal labe...

Page 54: ...s of Company A and B are connected to four NEs The Ethernet service between the NEs is not of a fixed point to point type For example a user of Company A connecting to NE3 may want to communicate with users of Company A connecting to other three NEs That is the flow direction of services is not definite The Ethernet Layer 2 switching function provided by the OptiX OSN 7500 can be employed to solve...

Page 55: ...ites Users regard the EVPLAN network as a big VLAN where the user service can be converged As shown in Figure 6 5 when the user s Ethernet frame the source address is MAC H and the destination address is MAC A B or C enters the PE equipment the system will search the Layer 2 transfer table for the internal label VC label Then the frame is transferred to the corresponding tunnel where it is attache...

Page 56: ... Ethernet service of the OptiX OSN equipment takes the protection of several levels including Protection of the spanning tree LCAS and flow control Protection of optical transmission layer such as MSP and SNCP 1 LCAS LCAS provides an error tolerance mechanism enhancing the reliability of concatenation It has the following functions Configure the system capacity add or reduce the number of VC invol...

Page 57: ...s shown in Figure 6 7 LCAS can protect the Ethernet service When some members fail the failed members will be deleted automatically While other members remain transmitting data normally When the failed members are available again they will be recovered automatically and the data will be loaded to them again Member Member Headquarters Branch Failed member Member Member Headquarters Branch Delete fa...

Page 58: ...mission Ethernet switch Ethernet switch MSTP Data transmission Data transmission Buffer is not full Buffer is not full Buffer is full Buffer is full Figure 6 8 Flow control at the Ethernet side 6 2 RPR Features This section introduces the RPR features of the OptiX OSN 7500 in terms of function application and protection 6 2 1 Function The EMR0 and EGR2 boards of the OptiX OSN 7500 supports resilie...

Page 59: ...d by the IEEE 802 17 standard Table 6 2 lists their functions Table 6 2 Functions of Ethernet boards supporting RPR Board Feature EMR0 EGR2 Interface 1xGE 12xFE 2xGE Service frame format MPLS MPLS JUMBO frame Supported 9600 bytes Supported 9600 bytes Max uplink bandwidth 2 5 Gbit s 2 5 Gbit s RPR bandwidth VC 3 VC 3 2v VC 4 VC 4 Xv X 16 VC 3 VC 3 2v VC 4 VC 4 Xv X 16 Ethernet virtual private line ...

Page 60: ... LAPS compliant with ITU T X 86 LCAS Supported compliant with ITU T G 7042 Supported compliant with ITU T G 7042 CAR Based on port or port VLAN with the granularity as 64 kbit s Based on port or port VLAN with the granularity as 64 kbit s Flow control Supported compliant with IEEE 802 3X and IEEE 802 3Z Supported compliant with IEEE 802 3X and IEEE 802 3Z Weighted fairness algorithm Supported Supp...

Page 61: ...an be automatically added deleted and switched There may be more than one EMR0 in equipment so an NE may have more than one RPR node The plug and play feature allows adding or deleting nodes without affecting the services on an RPR To increase or decrease the total bandwidth of an RPR use the LCAS function The LCAS features adding and reducing bandwidth dynamically without affecting existing servi...

Page 62: ...le to decide the access rate of a node A node needs to set weights at the outer and the inner rings and the two weights decide the bandwidth of low class services upon bandwidth contention As shown in Figure 6 11 the outer ring weights of nodes 2 3 and 4 are 1 Suppose the available bandwidth on the outer ring for low class services is 1 2 Gbit s the fairness algorithm will allocate 400 Mbit s for ...

Page 63: ...400 Mbit s 1 Node3 Node4 Node Weight Node2 1 1 1 Figure 6 11 Fairness algorithm when the weight is 1 Node 1 Node 2 Node 5 Node 6 Dual ring 2 5 Gbit s RPR Node 4 Node 3 1 3 2 2 3 Traffic Bandwidth 200 Mbit s 600 Mbit s 400 Mbit s 1 Node3 Node4 Node Weight Node2 1 3 2 Figure 6 12 Fairness algorithm when the weights are different 6 2 2 Application The EMR0 and EGR2 boardS support the application of E...

Page 64: ...EVPL service Node 2 inserts Tunnel and VC labels to the packet sends it to the RPR Node 3 forwards the packet and the destination node 4 strips it Figure 6 14 illustrates the EVPL service convergence implementing traffic classification through port VLAN so that services can be concentrated at the GE port of node 1 Node 1 Node 3 FE GE Dual ring 2 5 Gbit s RPR Action Tunnel VC Destination Insertion ...

Page 65: ...PLS VMAN The EVPLAN service is realized by creating virtual bridge VB in the board Each board may have up to 32 VBs each of which has 16 logic ports VB supports source MAC address learning and static MAC route configuration Figure 6 15 shows an example of EVPLAN service The VB of each node determines the forward port of packets through address learning rpr1 is the port to access packets to the RPR...

Page 66: ...pment takes the protection of several levels including Wrapping and Steering Spanning tree and LCAS Protection of optical transmission layer such as MSP and SNCP 1 Wrapping If an equipment or facility failure is detected the traffic is wrapped back to the opposite direction at the stations adjacent to the failure connecting the outer ring with the inner ring The protection switching time is less t...

Page 67: ...l send traffic to the destination through a route avoiding the failed link The protection switching time is less than 50ms The steering protection does not waste bandwidth however it needs longer switching time and some data before setting up a route may be lost Figure 6 17 illustrates an example of steering protection Node 4 sends traffic to node 1 on the outer ring through nodes 3 and 2 If there...

Page 68: ...3 1 Functions The OptiX OSN 7500 provides four different ATM processing boards ADL4 ADQ1 IDL4 and IDQ1 The IDL4 and the IDQ1 support inverse multiplexing for ATM IMA An ADL4 IDL4 board can access and process one STM 4 ATM service and an ADQ1 IDQ1 board can access and process four STM 1 ATM services When working with the PL3 PD3 board the ADL4 board or ADQ1 board can access and process E3 ATM servi...

Page 69: ... Gbit s Mapping mode VC3 VC4 VC4 4c or VC4 Xv X 1 4 VC3 VC4 VC4 4c VC4 Xv X 1 4 Processable service types CBR rt VBR nrt VBR and UBR CBR rt VBR nrt VBR and UBR Number of ATM connections 8000 8000 Traffic type and QoS IETF RFC2514 IETF RFC2514 Supportable ATM multicast connections Spatial multicast and logic multicast Spatial multicast and logic multicast ATM protection ITU T I 630 Unidirectional b...

Page 70: ... ATM Forum TM 4 0 and ATM Forum UNI 3 1 recommendations as shown in the Table 6 5 Table 6 5 Supportable ATM service and traffic types of the OptiX OSN 7500 No Traffic type Service type Parameter 1 atmNoTrafficDescriptor UBR None UBR 1 Clp01Pcr 2 atmNoClpNoScr CBR Clp01Pcr 3 atmClpNoTaggingNoScr CBR Clp01Pcr Clp0Pcr 4 atmClpTaggingNoScr CBR Clp01Pcr Clp0Pcr 5 atmNoClpScr nrt VBR 1 Clp01Pcr Clp01Scr...

Page 71: ...e 155 Mbit s ATM service of NE2 occupies a VC4 bandwidth alone SDH timeslot pass through is only performed at NE3 After they reach the central site NE4 they are converged through the ATM board and output through the 622 Mbit s optical interface 2 5 Gbit s SDH Ring NE 2 NE 4 NE 1 NE 3 34M ATM Traffic 34M ATM Traffic 155M ATM Traffic 622M ATM Traffic Service Convergence DSLAM DSLAM Router DSLAM Figu...

Page 72: ...he ATM traffic from NE1 is droped to the NE2 then send to VP VC Ring after converged with local service Figure 6 19 VP VC Ring 6 3 3 Protection The ATM service of the OptiX OSN equipment is protected on many layers including Protection on the ATM layer Protection on the optical transmission layer such as MSP and SNCP 1 Protection on the ATM Layer Compliant with ITU T Recommendation I 630 protectio...

Page 73: ...ect Single connection protecton Group connection protection 2 Protection on the Optical Transmission Layer The ATM service is also protected by the self healing network on the optical transmission layer such as MSP and SNCP You can set the hold off time for ATM protection switching When network impairment occurs the MSP or SNCP on lower layers can be switched first thus achieving the protection of...

Page 74: ...ystem is to be purchased and installed additionally for the OptiX OSN 7500 The OptiX OSN 7500 provides a set of stand alone intelligent software system that is quite convenient and flexible in use in dynamic bandwidth allocation intelligent route finding and configuration of services The bandwidth availability using the OptiX OSN 7500 is improved The OptiX OSN 7500 Supports service level agreement...

Page 75: ...e with the switching time from 100ms to several seconds Unprotected service Provided with no protection in the case of any fault Extra service Pre empted by services with higher priorities when the network resource is insufficient 2 SLA Based Protection at Different Service Levels With the SLA service provided the OptiX OSN 7500 enables the operators to win more customers in a differentiated marke...

Page 76: ...ively received at the destination end thus guaranteeing the service of diamond level The source node sends the dual traffic on rings The receive node selects the traffic Figure 7 1 Networking protection for diamond level service For gold level service the logical virtual multiplex section MS ring must be predefined As shown in Figure 7 2 the bandwidth of Ring 1 Ring 2 and virtual ring are specifie...

Page 77: ... above two services Compared with the two services described above the silver service has an advantage that it does not need bandwidth reservation for recovery thus improving the bandwidth utilization As shown in Figure 7 3 when the service link fails a new path will be found to recover the service There are two modes for rerouting revertive and non revertive If the service reverts to the original...

Page 78: ...high bandwidth utilization of the mesh network 7 2 Automatic End to End Service Configuration The end to end service can be rapidly generated and protected by some simple operations listed below through the NM system Select the source node Select the destination node Select desired bandwidth Select a service level Create a service connection automatically ...

Page 79: ...iple routes available between two nodes This effectively protects the traffic against node congestion and node failure The one shown in Figure 7 3 is an example of mesh networking 7 4 Traffic Engineering The traffic engineering control technique of the OptiX OSN 7500 allows a load balance traffic networkwide for convenient network planning and improved bandwidth availability 1 2 1 Network without ...

Page 80: ...elligent service of the OptiX OSN 7500 is an application that integrates the above intelligent features including SLA traffic engineering mesh networking and configuration of end to end service on the NM system Dynamically apply for service SLA supported Configure end to end service on the NM system Calculate the requirement satisfying best service path based on traffic engineering The main techno...

Page 81: ...work level protection 8 1 Equipment Level Protection The OptiX OSN 7500 supports the following protection schemes at the equipment level TPS protection for tributary boards TPS protection for Ethernet boards 1 1 backup for ATM IMA interface boards 1 1 backup for the cross connect unit and timing unit 1 1 backup for the SCC unit 1 1 backup for the power input unit 1 N protection for the 3 3 V board...

Page 82: ... 1 backup for ATM data boards ADL4 ADQ1 IDL4 IDQ1 Two ATM data boards backup each other If either fails the other takes over 8 1 4 1 1 backup for the Cross Connect and Timing Unit The cross connection and timing functions are provided by the GXCS board The GXCS board use 1 1 backup for protecting the cross connect unit and the timing unit at the same time When the active cross connect and timing u...

Page 83: ...unit 8 1 9 Abnormality Specific Board Protection 1 Power Failure during Software Loading Application program and data have the check function When software loading is interrupted the basic input output system BIOS will not start the unfinished program and data until they are successfully loaded 2 Over voltage and Under voltage Protection The power board is designed with a lightning protection comp...

Page 84: ...ction ring with the switching time less than 50ms as specified in ITU T Recommendation G 841 In line with ITU T Recommendation G 841 the OptiX OSN 7500 supports four fiber MS shared protection ring which provides ring switching and span switching in addition to the similar functions of the two fiber bidirectional MSP 8 2 2 SDH SNCP The OptiX OSN 7500 supports SNCP as required by ITU T Recommendati...

Page 85: ...th level rings can be set with protection schemes such as path protection PP MSP SNCP and non protection NP 8 2 5 MS Shared Optical Path Protection In the MS shared optical path protection an optical interface can be configured with multiple MSP groups so that MSP rings can share the same fiber and optical interface This function is conditioned on the optical board s capability of processing multi...

Page 86: ...er speed west line units share one higher speed east line unit as shown in Figure 8 3 STM 16 MSP ring 1 MSP ring 2 X STM 16 STM 16 STM 64 Figure 8 3 Two lower speed lines share one higher speed line The OptiX OSN 7500 also supports the line units at the same speed to form a bidirectional sharing protection as shown in Figure 8 4 In this case the west STM 16 line units can only add part of VC 4 int...

Page 87: ... which channel used Because each node has only three kinds of operation on the packet packet insertion insert a new packet to the ring packet forwarding forward the packet and packet dropping drop the packet to the local site This merit greatly reduced the communication workload between nodes especially when compared with the mesh network that has to decide to forward to which port according to ea...

Page 88: ...ing Node 1 Node 2 Node 3 Node 4 Node 5 RPR Steering Figure 8 7 Steering of RPR 8 2 8 VP Ring VC Ring Protection VP Ring VC Ring protection switching on the ATM layer is similar to path protection for SDH in principle and features as shown in Figure 8 8 VP Ring VC Ring protection reserves protection resources to achieve protection It can be used on any physical topology The reserved protection reso...

Page 89: ...rotected by adopting the mode of dual fed and selective receiving Two connections working path and protection path are created respectively between the source node NE1 and the sink node NE3 Normally the receive end selects the service transmitted over the working path When the primary ring fails the receive end starts protection after detecting relevant failure information and switches the receive...

Page 90: ...k administrators to take proper measures in the case of any emergency Provides 16 alarm input interfaces four alarm output interfaces four cabinet alarm indicator output interfaces and alarm concatenation interfaces to facilitate operation and management of the equipment All boards are provided with running and alarm indicators to help the network administrators to locate and handle faults as soon...

Page 91: ...rovides the functions of error prevention loading and resume download With remote maintenance function the maintenance personnel can remotely maintain the OptiX OSN 7500 through PSTN when the equipment goes faulty The PDH processing board provides pseudo random code test function which supports remote bit error test 9 2 Administration The OptiX OSN 7500 is uniformly managed by the iManager series ...

Page 92: ...ce performance Clock performance Transmission performance Power consumption of boards Electromagnetic compatibility Environmental index Environment requirement 10 1 Optical Interface Performance 10 1 1 SDH Optical Interface Table 10 1 shows the performance of the STM 1 optical interface of the OptiX OSN 7500 Table 10 1 Performances of the STM 1 optical interface of the OptiX OSN 7500 Nominal bit r...

Page 93: ...iX OSN 7500 Table 10 2 Performances of the STM 4 optical interface of the OptiX OSN 7500 STM 4 Nominal bit rate 622080 kbit s Classification code I 4 S 4 1 L 4 1 L 4 2 Ve 4 2 refer to G 691 Operating wavelength nm 1310 1310 1310 1550 1550 Optical source type LED MLM MLM MLM SL M SLM SLM Mean launched optical power dBm 15 to 8 15 to 8 3 to 2 3 to 2 3 to 2 Minimum sensitivity dBm 23 28 28 28 33 Mini...

Page 94: ... Minimum extinction ratio dB 8 2 8 2 8 2 8 2 8 2 8 2 8 2 8 2 Note 1 The optical power value is the optical power output from the optical amplifier board Note 2 Formulated according to the basic rules though adjustment and optimization are made to part of the parameters Table 10 4 Performances of the STM 16 FEC optical interface of the OptiX OSN 7500 Nominal bit rate 2 66 Gbit s Classification code...

Page 95: ...12 15 Note 1 Minimum sensitivity dBm 11 14 14 22 5 24 23 Minimum overload point dBm 1 1 3 9 9 7 Minimum extinction ration dB 6 8 2 8 2 8 2 8 2 8 2 Maximum dispersion ps nm 6 6 800 1600 1200 1600 800 Refer to G 692 and G 691 Note 1 Note 1 The optical power value is the optical power output from the optical amplifier board Note 2 Formulated according to the basic rules though adjustment and optimiza...

Page 96: ...ptical amplifiers and dispersion compensation unit Table 10 7 shows performance of the STM 16 and STM 64 fixed wavelength optical interface Table 10 7 Performance of the STM 16 and STM 64 fixed wavelength optical interface Nominal bit rate 2488320 kbit s 9953280 kbit s Application code 8 x 22 dB 5 x 30 dB 3 x 33 dB 1 x 29 dB Despersion limit km 170 170 640 40 Mean launched power dBm 2 to 3 5 to 7 ...

Page 97: ... 192 7 1555 75 27 194 7 1539 77 8 192 8 1554 94 28 194 8 1538 98 9 192 9 1554 13 29 194 9 1538 19 10 193 0 1553 33 30 195 0 1537 40 11 193 1 1552 52 31 195 1 1536 61 12 193 2 1551 72 32 195 2 1535 82 13 193 3 1550 92 33 195 3 1535 04 14 193 4 1550 12 34 195 4 1534 25 15 193 5 1549 32 35 195 5 1533 47 16 193 6 1548 51 36 195 6 1532 68 17 193 7 1547 72 37 195 7 1531 90 18 193 8 1546 92 38 195 8 1531...

Page 98: ...3 22 9 100BASE FX 2km 19 to 14 1270 1380 14 30 10 100BASE FX 15km 15 to 8 1261 1360 7 32 8 2 10 1 3 ATM Optical Interface The Specifications of the ATM optical interface of the OptiX OSN 7500 are shown in Table 10 10 Table 10 10 Specifications of 155 Mbit s ATM optical interface of the OptiX OSN 7500 Nominal bit rate 155520 kbit s 622080 kbit s Classification code I 1 S 1 1 L 1 1 S 4 1 L 4 1 Opera...

Page 99: ...ency deviation at input port G 703 compliant Input jitter tolerance G 703 compliant 10 3 Clock Performance 10 3 1 Clock Interface Type Table 10 12 shows clock features of the OptiX OSN 7500 Table 10 12 Clock features of the OptiX OSN 7500 Clock type Feature External synchronization source Two inputs 75Ω 2048 kbit s G 703 6 or 2048 kHz G 703 10 Two inputs 120Ω 2048 kbit s G 703 6 or 2048kHz G 703 1...

Page 100: ...itter at STM N interface Jitter at PDH interface Bit error performance G 813 G 825 compliant G 823 G 783 compliant G 826 compliant 10 5 Power Consumption and Weight of Boards Table 10 15 lists the power consumption and weight of the OptiX OSN 7500 boards Table 10 15 Power consumption and weight of boards Board Power consumption W Weight kg Board Power consumption W Weight kg SF64 37 1 12 D75S 5 5 ...

Page 101: ... BPA 20 1 01 ETS8 2 0 37 SEP1 SEP 17 0 95 ADL4 35 0 90 EU08 11 0 41 ADQ1 35 0 95 EU08A 2 0 40 IDL4 35 1 02 OU08 6 0 41 IDQ1 37 1 02 EU04 6 0 40 MST4 40 0 90 SPQ4 24 0 91 LMST4 40 0 90 MU04 2 0 41 GXCSA 41 1 78 PD3 19 1 12 GXCSB 53 1 86 PL3 15 1 00 EOW 13 0 45 D34S 2 0 38 AUX 3 0 42 C34S 2 0 31 FAN 30 1 50 PQ1 19 1 01 PIU 8 1 25 PQM 22 1 01 MR2A 0 1 01 LWX 30 1 10 MR2C 0 1 00 GSCC 15 0 9 ...

Page 102: ...d Radiated emission EN55022 Class A Passed Electrostatic discharge International Electrotechnical Commission IEC 1000 4 2 air discharge 8kV contact discharge 6kV Passed Immunity to radiated electromagnetic fields IEC1000 4 3 10V m Passed Electrical transient burst immunity IEC1000 4 4 2kV Passed Inject current immunity IEC1000 4 6 3V Passed 10 7 Environment Indexes Table 10 17 lists the environmen...

Page 103: ...1 Environment for Storage 1 Climate Table 10 18 shows the climate environment required for storing the OptiX OSN 7500 Table 10 18 Climate environment for storage Item Range Altitude 5000 m Air pressure 70 kPa 106 kPa Temperature 40 C to 70 C Temperature change rate 1 C min Relative humidity 10 100 Solar radiation 1120 W s Heat radiation 600 W s Air speed 30 m s 2 Waterproof 1 The equipment is requ...

Page 104: ...osive electric conductive magnetic conductive or corrosive dust 2 The density of the mechanical active substances complies with the requirements listed in Table 10 19 Table 10 19 Density for mechanical active substances Mechanical active substance Content Suspending dust 5 00 mg m Precipitable dust 20 0 mg m h Gravel 300 mg m 3 The density of the chemical active substances complies with the requir...

Page 105: ...e generated by the equipment under the stipulated impact motivation Impact response spectrum II indicates the duration of semi sinusoidal impact spectrum is 6ms Static load The pressure from upside that the equipment with package can endure when the equipment is piled as stipulated 10 8 2 Environment for Transportation 1 Climate Table 10 22 shows the climate environment required for transporting t...

Page 106: ...ulated water within transportation facilities 3 Biological Environment 1 Avoid multiplication of microbe such as eumycete and mycete 2 Avoid rodentia animals such as mice 4 Air Cleanliness 1 No explosive electric conductive magnetic conductive or corrosive dust 2 The density of the mechanical active substances complies with the requirements listed in Table 10 23 Table 10 23 Density for mechanical ...

Page 107: ... 30 mg m H2S 0 10 mg m NO2 0 50 mg m NH3 1 00 mg m Cl2 0 10 mg m HCl 0 10 mg m HF 0 01 mg m O3 0 05 mg m 5 Mechanical Stress Table 10 25 Requirements for mechanical stress Item Sub item Range Shift 7 5 mm NA NA Acceleration NA 20 0 m s 40 0 m s Sinusoidal vibration Frequency range 2 Hz 9 Hz 9 Hz 200 Hz 200 Hz 500 Hz Acceleration spectral density 10 m s 3 m s 1 m s Random vibration Frequency range ...

Page 108: ... and Table 10 27 show the required climate environment in which the OptiX OSN 7500 operates Table 10 26 Requirements for temperature and humidity Temperature Relative humidity Long term operation Short term operation Long term operation Short term operation 0 C 45 C 5 C to 55 C 10 90 5 95 Note Temperature and humidity values are obtained 1 5 m above the floor and 0 4 m in front of the equipment Sh...

Page 109: ...ical active substances complies with the requirements listed in Table 10 28 Table 10 28 Density for mechanical active substances Mechanical active substance Content Dust particle 3x105 particles m Suspending dust 0 4 mg m Precipitable dust 15 mg m h Gravel 100 mg m 3 The density of the chemical active substances complies with the requirements listed in Table 10 29 Table 10 29 Density for chemical ...

Page 110: ...n Frequency range 2 Hz 9 Hz 9 Hz 200 Hz Impact response spectrum II 100 m s Non steady impact Static load 0 Note Impact response spectrum The curve of the maximum acceleration response generated by the equipment under the stipulated impact motivation Impact response spectrum II indicates the duration of semi sinusoidal impact spectrum is 6ms Static load The pressure from upside that the equipment ...

Page 111: ...l electrical characteristic of hierarchical digital interfaces G 704 Synchronous frame structures used at 1544 6312 2048 8448 and 44736 kbit s hierarchical levels G 707 Network node interface for the synchronous digital hierarchy SDH G 775 Loss of signal LOS and alarm indication signal AIS defect detection and clearance criteria G 773 Protocol suites for Q interfaces for management of transmission...

Page 112: ...ectives for international cOSNtant bit rate digital paths at or above the primary rate G 831 Management capabilities of transport networks based on the Synchronous Digital Hierarchy SDH G 841 Types and characteristics of SDH network protection architectures G 842 Cooperation of the SDH network protection structures G 958 Digital line systems based on the synchronous digital hierarchy for use on op...

Page 113: ...0 Mb s operation IEEE802 1q Virtual bridged local area networks IEEE802 3ad Aggregation of multiple link segments IEEE802 1D Media Access Control MAC Bridges IEEE802 1X Port based network access control IEEE802 17 Resilient packet ring access method and physical layer specifications A 3 IETF Standards Standard Description RFC2615 1999 PPP Point to Point Protocol over SONET SDH RFC1662 1994 PPP in ...

Page 114: ...onyms used in this manual are listed below Abbreviation Full name A ABR Available Bit Rate AMI Alternate Mark Inversion APS Automatic Protection Switching ATM Asynchronous Transfer Mode B BDI Backward Defect Indication BIOS Basic Input Output System C CAR Committed Access Rate CBR Constant Bit Rate CC Continuity Check CMI Coded Mark Inversion CPU Center Processing Unit ...

Page 115: ... Interface E ECC Embedded Control Channel EMC Electromagnetic Compatibility EPL Ethernet Private Line EPLAN Ethernet Private LAN ESCON Enterprise Systems Connection ETS European Telecommunication Standards ETSI European Telecommunications Standards Institute EVPL Ethernet Virtual Private Line EVPLAN Ethernet Virtual Private LAN F FDI Forward Defect Indication FC Fibre Channel FE Fast Ethernet FICO...

Page 116: ...International Telecommunication Union Telecommunication Standardization Sector ITU T International Telecommunication Union Telecommunication Standardization Sector L LAN Local Area Network LAPS Link Access Procedure SDH LB Loopback LCAS Link Capacity Adjustment Scheme LCT Local Craft Terminal LPT Link State Path Through LSP Label Switch Path M MAC Media Access Control MAN Metropolitan Area Network...

Page 117: ...peration Administration Maintenance and Provision OSP OptiX Software Platform OTM Optical Terminal Multiplexer P PDH Plesiochronous Digital Hierarchy PE Provider Edge PP Path Protection PPP Point to Point Protocol R RPR Resilient Packet Ring RSTP Rapid Span Tree Protocol rt VBR Real Time Variable Bite rate RSVP TE Resource Reservation Setup Protocol with Traffic Engineering Extensions S SDH Synchr...

Page 118: ...NCP Sub Network Connection Protection STP Span Tree Protocol T TPS Tributary Protection Switching U UBR Unspecified Bit Rate V VBR Variable Bit Rate VC Virtual Channel VCC Virtual Channel Connection VLAN Virtual Local Area Network VP Virtual Path VPC Virtual Path Connection VPN Virtual Private Network W WDM Wavelength Division Multiplexing ...

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