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Huawei OptiX OSN 3500. Technical Manual - part 4

Networking

improved, and the corresponding maintenance and management becomes

convenient for the operator.

Company A

Company B

NE1

NE2

NE4

Company A

SHR

Company B

NE3

MAC Address

Destination

VC-Trunk

VC Trunk

MAC 1

NE1

①

Company A

Company B

MAC 2

NE4

②

MAC 3

NE2

③

…

Figure 4-7 L2 switching of Ethernet service

6. Rapid Spanning Tree Protocol

When deployed in ring network, the OptiX OSN 3500 can automatically start the

Rapid Spanning Tree Protocol (RSTP) and logically modify the network topology to

avoid network storm. Figure 4-8 shows a modified logical topology.

4-6

Networking

Company A

Company B

NE1

NE2

NE4

Company

SHR

Company

NE3

MAC

Desti

VC-Trunk

VC Trunk

MAC 1

NE1

①

Company

MAC 2

NE4

②

Company

MAC 3

NE2

③

…

Figure 4-8 Network topology with RSTP started

7. EPL/EVPL Service

The OptiX OSN 3500 adopts the Martini modes to construct the MPLS L2 VPN and

provides EPL/EVPL service. As shown in Figure 4-9, the system will check the Port +

Vlan ID table and add the external label (Tunnel) and internal label (VC) it gets to the

accessed Ethernet frames. Data transfer in the network is based on the external label,

which will be discarded at the Provider Routers (P) equipment at the last hop. Then,

the data will be transmitted to the corresponding Provider Edges (PE) equipment,

which transfers the data to corresponding port according to the internal label. The

OptiX OSN 3500 integrates the function of P equipment and PE equipment.

4-7

Networking

Data

PE1

PE2

Corp A

Port A

Port B

Tunnel label

switching

stripped

Corp B

L2 MPLS Network

composed by OptiX

OSN 3500

Company

Tunnel Label

VC Label

Data

Corp A

Frame transfered by

Corp B

PE2 according VC label

Figure 4-9 Application of EPL/EVPL service

8. EPLAN/ EVPLAN Service

The OptiX OSN 3500 adopts the Martini mode to provide the EPLAN/ EVPLAN and

implement the multipoint-to-multipoint connection of user sites. From the angle of user,

the EPLAN/ EVPLAN network is a big Vlan where the user service can be converged.

As shown in Figure 4-10, when the user’s Ethernet frame (with the source address

being MAC H, and the destination address being MAC A, B or C) enters the PE

equipment, the system will check the Layer 2 transfer table and attach the internal

label (VC Label) it gets to the frame. Then, the frame is transferred to corresponding

tunnel, where it is attached with the external label (Tunnel Label), and different Label

Switch Paths (LSPs) are set up according to different addresses. The Ethernet frame

is detached from the Tunnel Label when leaving the P equipment, and then

transferred to corresponding PE equipment, where the VC Label is detached. After

that, the Ethernet frame is transferred to corresponding output port according to the

Layer 2 transfer table.

4-8

Networking

MPLS Core

Address =

MAC C

Branch C

Address =

MAC A

Address =

MAC B

Branch A

Branch B

LSP3

LSP1

LSP2

Transferred to

corresponding port

via the Layer 2

route table

Address =

Source

Sink

Tunnel Label

VC Label

LSP

MAC H

MAC A

LSP1

MAC H

MAC B

LSP2

Headquarter

MAC H

MAC C

LSP3

Figure 4-10 Application of EPLAN/ EVPLAN

4-9

5 Operation, Maintenance and

Management

5.1 Equipment Operation and

Maintenance

The OptiX OSN 3500 addresses the needs of the customers for the Operation,

Maintenance and Management (OAM) of the equipment in terms of cabinet, board

design, and function setting. It provides the following powerful equipment

maintenance capabilities.

The subrack generates audible and visual alarms to remind the network

administrators to take proper measures in the case of any emergency.

It provides sixteen Boolean value input interfaces and four Boolean value

output interfaces, and four cabinet alarm indicator output interfaces for

convenient 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 as possible.

The subrack supports Automatic Laser Shutdown (ALS) function of the

single-mode optical interface of the SDH interface unit and Ethernet interface

unit.

The Optical interface boards (Include EGS2) adopts Small Form-factor

Pluggable (SFP)-encapsulated optical module to provide users options of

single-mode or multimode optical modules for selection in practice. In this case,

only by replacing a cheap optical module, the telecommunication operator can

lease a line or GE service of different transmission distance to user without

5-1

Operation, Maintenance and Management

interrupting service at other ports, or replacing board or disconnecting the

power supply.

Orderwire phone function is provided to ensure dedicated communication

channels for administrators at various stations.

By means of the NM system, the running and alarm status of the equipment at

all stations on the network are dynamically monitored.

Board software and host software can be upgraded and loaded on-line. Board

software and Flexible Programmable Gate Array (FPGA) supports remote

loading, and provides the functions of error prevention loading and breakpoint

continuous transmission.

With remote maintenance function, the maintenance personnel can remotely

maintain the OptiX OSN 3500 through PSTN when the equipment goes faulty.

The PDH processing board provides invasion pseudo-random code test

function which supports remote bit error test.

5-2

Operation, Maintenance and Management

5.2 Equipment Management

The OptiX OSN 3500 is uniformly managed by the NM system. Through the Qx

interface or MML interface, the NM system can implement management,

maintenance and test to the whole optical transmission system in terms of fault,

performance, configuration and security. The NM system improves the quality of

network services, reduces the maintenance cost and ensures rational use of network

resources.

Huawei Technologies Co., Ltd. provides telecommunication operators with a whole

series of optical transmission systems, which can be used on networks of different

layers. To manage sub-network, area network or national network efficiently, the NM

system is required to feature basic operation and maintenance functions, and the

monitoring and management capability on the optical transmission network as well.

According to the Telecommunications Management Network (TMN) network

management hierarchical model, the telecommunication network management is

divided into network element layer (NEL), NE management layer (EML), network

management layer (NML), service management layer (SML) and business

management layer (BML). The NE management system manages NE equipments

within one subnet, while the NM system implements the network layer assignment,

fault monitoring, performance analysis, resource analysis, circuit dispatching, etc. in a

large-scale network.

To adapt to network management of different scales and levels, the OptiX iManager

series products of Huawei consists of the local maintenance terminal, NE

management system, regional network management system and network level NM

system. These products cover the applications of the TMN from the NE management

layer, subnet management layer to the network management layer, and contain part

of the service management layer functions. All the OptiX iManager series products

can perform uniform management on SDH, WDM and OSN equipments. With these

products, Huawei is able to provide telecommunication operators with a complete

package of network management solutions for single equipment, single service to

large scale and multi-service networks.

5-3

6 Equipment Hardware

6.1 Cabinet

The OptiX OSN 3500 can be installed in the 300mm-deep ETSI cabinet. Table 6-1

shows the technical specifications of cabinets for the OptiX OSN 3500.

Table 6-1 Technical specifications of cabinets for the OptiX OSN 3500

Type

Size

Weight (kg)

2600mm (H) × 600mm (W) × 300mm (D)

300mm-deep

ETS300 119

2200mm (H) × 600mm (W) × 300mm (D)

70.4

standard

cabinet

2000mm (H) × 600mm (W) × 300mm (D)

6-1

Equipment Hardware

Figure 6-1 OptiX OSN 3500 cabinet

6-2

Equipment Hardware

6.2 Subrack

The size of the OptiX OSN 3500 subrack is 730mm (H) × 496mm (W) × 295mm (D). A

single empty subrack weighs 18.6kg.

Figure 6-2 OptiX OSN 3500 subrack

6-3

7 Technical Specifications

7.1 Interface Type

The interface types of the OptiX OSN 3500 are shown in Table 7-1.

Table 7-1 Interface types of the OptiX OSN 3500

Interface type

Rate and feature

Ethernet interface

10Base-T, 100Base-TX, 1000Base-SX, 1000Base-LX

PDH/SDH

1544kbit/s, 2048kbit/s, 34368kbit/s, 44736kbit/s, 139264kbit/s,

electrical interface

155520kbit/s

SDH optical

155520kbit/s, 622080kbit/s, 2488320kbit/s, 9953280kbit/s

interface

Clock interface

2048kbit/s, 2048kHz

Sixteen alarm input interfaces, four alarm output interfaces,

Alarm interface

concatenated alarm input/output interface, cabinet alarm

indicator interface

Auxiliary interface

Administration interface, orderwire interface, data interface

7-1

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