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HUAWEI OptiX OSN 8800 T64/T32 Intelligent Optical Transport Platform. Product Description - part 12

5.4.1.5 OptiX OSN 8800 T32 DC Input Protection

The power supply system of an OptiX OSN 8800 T32 subrack uses four power supply boards

to separately provide -48 V/-60V power inputs for the two sections of the subrack.

The power supply system supports four -48 V/-60 V DC power inputs for mutual backup in

OptiX OSN 8800 T32 subrack. The power supply system adopts the switched-mode power

supply mode for two areas, that is, the blue-slot area and the yellow-slot area, as shown in Figure

5-17. Each area is configured with a pair of power supplies of mutual backup: one pair is IU39

and IU45, and the other pair is IU40 and IU46. The normal operation of the equipment is not

affected in the case of failure of any external input -48 V/-60V power supply. Figure 5-17 shows

the two pairs of power supplies of mutual backup.

Figure 5-17 Power distribution and supply for the OptiX OSN 8800 T32 subrack

FAN IU51

AUX

STG

STG

EFI2

EFI1

PIU

PIU

PIU

PIU

STI

ATE

IU43

IU37

IU38

IU39

IU40

IU41 IU42

IU44

IU45

IU46

IU47

IU48

SCC

IU20

IU21

IU22

IU23

IU24

IU25

IU26

IU27

IU29

IU30

IU31 IU32

IU33

IU34 IU35

IU36

IU28

XCH

XCH

/

/

XCM

XCM

IU9

IU10

SCC

IU1

IU2

IU3

IU4

IU5

IU6

IU7

IU8

IU12

IU13 IU14

IU15

IU16 IU17

IU18

IU19

IU11

FAN IU50

5.4.1.6 Redundancy Protection for Fans

In the OptiX OSN 8800 T32 system, each subrack has two fan areas. In the OptiX OSN 8800

T64 system, each subrack has four fan areas. And each fan area has three fans for heat dissipation.

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The speed of each fan can be adjusted independently and the failure of any fan does not affect

the other fans.

5.4.1.7 Inter-Subrack Communication Protection

Subracks of an NE can be cascaded in various modes. When subracks are cascaded to form a

ring, the NE provides working and protection Ethernet communication channels for

communication between the master and slave subracks. In this case, when the working channel

is faulty, services are switched to the protection channel, achieving protection for inter-subrack

communication.

5.4.2 Network Level Protection

OptiX OSN 8800 T32/8800 T64 provides various network protection schemes, including WDM

protection schemes and a great variety of data service protection schemes.

For principles of the protections, refer to the Feature Description.

The security and survivability of a network can be further enhanced through an automatic

switched optical network (ASON), which is generally referred to as intelligent optical network.

As a main networking mode of ASON, mesh features high flexibility and scalability. On a mesh

network, to make the interrupted services available, you can immediately restore the services

through the rerouting mechanism in addition to the traditional protection scheme such as 1+1

protection and shared protection scheme such as ODUk SPRing. That is, the mesh network can

support traditional protection schemes, dynamic restoration of services, and service restoration

mechanisms in case of protection failures. In this manner, services are not interrupted if the

resources are available.

For principles of the ASON protections, refer to the ASON User Guide.

5.4.2.1 WDM Protection

The OptiX OSN 8800 T32/8800 T64 provides various types of WDM protection, as listed in

Table 5-8.

For principles of the protections, refer to the Feature Description.

Table 5-8 WDM protection

Category

Sub-Category

Description

Optical line

Optical line

It uses the dual fed and selective receiving function of the

protection

protection

OLP board to protect line fibers between adjacent stations

by using diverse routing.

Optical

Client-side 1+1

It uses the dual fed and selective receiving function of the

channel

protection

OLP/DCP/SCS board to protect the OTU and the OCh

protection

fibers.

Intra-board 1+1

It uses the dual fed and selective receiving function of the

protection

OTU/OLP/DCP board to protect the OCh fibers by using

diverse routing.

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Category

Sub-Category

Description

SNCP

SW SNCP

The intra-board cross-connections on the TOM board

Protection

implement the dual fed and selective receiving function.

In this manner, the SW SNCP protection protects the OCh

fiber.

ODUk SNCP

It uses the dual fed and selective receiving function of the

protection

electrical layer grooming to protect the line board and the

OCh fibers. The cross-connect granularity is ODU0

signals, ODU1 signals, ODU2 signals and ODU3 signals.

Tributary

Protects the tributary service by using the dual-fed and

SNCP

selectively-receiving function at the electrical cross-

connect layer. The cross-connect granularity is ODU0

signals, ODU1 signals, ODU2 signals and ODU3 signals.

VLAN SNCP

Uses the dual-fed selective receiving function of a L2

protection

module to protect Ethernet services. The protection

granularity is the service with VLAN.

ODUk

ODUk SPRing

It applies to the ring network with distributed services.

SPRing

protection

This protection uses two different ODU1 or ODU2

protection

channels to achieve the protection of multiple services

between all stations.

OWSP

OWSP

It applies to the ring networks. This protection uses two

different wavelengths to achieve the protection of one

wavelength of service between all stations.

ASON

Optical-layer

Protects services of OCh wavelength level.

protection

ASON

Electrical-layer

Protects services of ODUk wavelength level.

ASON

5.4.2.2 SDH Protection

The OptiX OSN 8800 T32/8800 T64 provides various types of SDH protection, as listed in

Table 5-9.

For details on the working principle of each type of protection, see the Feature Description.

Table 5-9 Service protection classifications

Category

Subcategory

Description

Linear MSP

1+1 linear MSP

It realizes dual transmitting and selective

receiving by using two fibers. In this manner, it

provides protection for the services on the link.

1:N (N ≤ 14) linear

It protects services by providing one protection

MSP

fiber for N working fibers.

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Category

Subcategory

Description

MSP Ring

Two-fiber

In this protection mode, half of the capacity of

bidirectional MSP

the fibers in each transmission direction is

ring

assigned to the service channel, and the other

half of the capacity is assigned for the protection

channel. The service timeslot and protection

timeslot in each direction are transmitted over

the same fiber. That is, the service signals and

protection signals are transmitted at the same

time over the same fiber.

Four-fiber

In this protection mode, two fibers are used in

bidirectional MSP

the transmit and protection directions. One of the

ring

fibers in each direction is used to transmit the

working service, and the other fiber is used to

transmit the protection service.

Transoceanic MSP

A transoceanic MSP ring can be a two-fiber bidirectional MS shared

Ring

protection ring or a four-fiber bidirectional MS shared protection ring.

When the network fails, the ring path is switched between the source

and sink nodes of the service rather than on two adjacent nodes of the

failed node to avoid multiple transoceanic events of the services, which

increase the delay of transmission in the long-haul transmission

network (for example, the marine system).

SNCP

In this protection mode, the service protection is implemented by means

of dual transmitting and selective receiving. That is, the services are

dual transmitted at the source but selectively received at the sink.

Sub-network

The SNCTP provides the protection path at the VC-4 level. When the

connection tunnel

working path is faulty, all its services are switched to the protection

protection

path.

(SNCTP)

Ethernet protection

Ethernet ring

This protection type is based on the traditional

protection

Ethernet mechanism and uses the Ethernet

operation, administration, and maintenance

(OAM) function and ring network automatic

protection switching (R-APS) protocol to realize

quick protection switching in the Ethernet ring

network.

LCAS

This protection type dynamically adjusts the

number of virtual containers required for service

mapping to provide protection for virtually

concatenated services.

LAG

In this protection mode, multiple links that are

connected to the same equipment are bundled

together to increase the bandwidth and improve

link reliability.

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Category

Subcategory

Description

STP/RSTP

When the STP or RSTP is started, it logically

modifies the network topology to avoid a

broadcast storm. The STP or RSTP realizes link

protection by restructuring the topology.

MSTP

In the case of the Ethernet user network where

loops exist, the MSTP generates the tree

topology according to VLAN IDs of the Ethernet

packets. Thus, the broadcast storm is avoided

and the network traffic is balanced according to

the VLAN IDs of the Ethernet packets.

DLAG

The distributed link aggregation group (DLAG)

is a board-level port protection technology used

to detect unidirectional fiber cuts and to

negotiate with the opposite end. In the case of a

link down failure on a port or a hardware failure

on a board, the services can automatically be

switched to the slave board, thus realizing 1+1

protection for the inter-board ports.

ASON protection

Protects services of STM-N, VC-4, VC-3.

5.4.2.3 Data Protection

The OptiX OSN 8800 T32/8800 T64 provides various types of data protection, as listed in Table

5-10.

For details on the working principle of each type of protection, see the Feature Description.

Table 5-10 Data protection

Protect

Description

ion

DBPS

DBPS protection works with Ethernet ring protection to protect the links between

protecti

Ethernet boards and BRAS, and also protect services at 10GE and GE ports on

on

Ethernet boards.

Etherne

Based on the traditional Ethernet mechanism and APS protocol specific to a ring

t ring

network, Ethernet ring protection achieves fast protection switching of an Ethernet

protecti

ring network.

on

LAG

An LAG binds multiple links on the same equipment, increasing the bandwidth

and improving link reliability.

STP and

When the STP or RSTP is running, it modifies the logical network topology to

RSTP

avoid a broadcast storm. The RSTP can achieve link protection by restructuring

the network topology.

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Protect

Description

ion

MSTP

In the case of a user Ethernet network with a loop, MSTP can generate a tree

topology by VLAN IDs of Ethernet packets to avoid a broadcast storm, and can

also achieve load sharing by VLAN IDs of user packets.

LPT

The link state pass through (LPT) is used to detect and report the faults that occur

at the service access node and in the intermediate transmission network. The LPT

notifies the equipment at two ends in the transmission network of starting the

backup network at the earliest time for communication, thus making sure the

normal transmission of the important data.

5.5 Data Characteristics

The OptiX OSN 8800 T32/8800 T64 supports the Ethernet features and mainly supports the

following Ethernet services: EPL, EVPL (QinQ), and EPLAN.

5.5.1 Service

The OptiX OSN 8800 T32/8800 T64 supports the Ethernet private lien (EPL), Ethernet private

local area network (EPLAN), and Ethernet virtual private line (EVPL, or QinQ) services. It saves

bandwidth resources while achieving dynamic sharing of Ethernet services among multiple

points.

EPL Service

The EPL services can also be classified into the EPL service based on port and the EPL service

based on port plus VLAN.

l EPL service based on port is intended for point-to-point transparent transmission of

Ethernet services. As shown in Figure 5-18, the Ethernet services from different NEs are

transmitted to the destination node through separate VCTRUNKs. Then the data from

different NEs can be transmitted in a reliable and secure manner.

Figure 5-18 EPL service based on port

l EPL service based on port plus VLAN is intended for convergence of Ethernet services.

For this type of an EPL service, a specific port or VCTRUNK can be shared. When a specific

port is shared by multiple services, the port resources can be saved, as shown in Figure

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5-19. When a specific VCTRUNK is shared by multiple services, the VCTRUNK resources

can be saved, as shown in Figure 5-20.

NOTE

On the NE, the number of VLAN services cannot exceed 32768.

Figure 5-19 Port-shared EPL service

Figure 5-20 VCTRUNK-shared EPL service

EPLAN Service

The OptiX OSN 8800 T32/8800 T64 supports Layer 2 switching of Ethernet data, that is,

EPLAN.

The concept of virtual bridge or various bridge (VB) is originally presented by Huawei.

According to the definition, each VB adopts an independent configuration mode. Each VB uses

one VLAN but different VBs may use the same VLAN.

In the system, one or more VBs can be set up on each NE and a MAC address table can be

created on each VB. The MAC address table for each VB can be updated through system self-

learning. Then the accessed data can be transmitted through different VCTRUNKs according to

the destination MAC addresses.

The EPLAN service is intended to dynamically share Ethernet services at multiple points. The

EPLAN service conforms to the dynamic feature of data services and saves the bandwidth

resources. For details, see Figure 5-21.

NOTE

On the NE, the number of VLAN services cannot exceed 32768.

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Figure 5-21 EPLAN service

EVPL (QinQ) Service

The EVPL (QinQ) service is intended to achieve "VLAN ID in VLAN ID". As the number of

network users continues to increase, the original VLAN IDs are not sufficient. The EVPL (QinQ)

service can solve this problem by identifying users with multi-layer VLAN IDs, and extending

VLAN IDs.

As a LAN technology, VLAN develops with the Ethernet switch technology. As the Ethernet

technology is widely used on networks (MAN Ethernet) of operators, using IEEE 802.1q VLAN

IDs to identify users and isolate the data is restricted. According to IEEE 802.1q, the VLAN tag

field contains only 12 bytes, which can indicate a maximum of 4,000 VLANs. In the MAN

Ethernet, however, the number of users far exceeds this maximum number.

To increase the number of VLANs, the QinQ technology is developed. According to the QinQ

technology, an IEEE 802.1q tag is attached to an IEEE 802.1q packet to increase the number of

VLAN IDs to 4,000 x 4,000. With the development of the MAN Ethernet and the requirements

of operators on elaborate operation, the QinQ technology can be used in more scenarios. The

inner and outer tags indicate different information. The inner tag (the C-VLAN) indicates the

client, and the outer tag (the S-VLAN) indicates the service. For details, see Table 5-11.

Table 5-11 EVPL (QinQ) service

Operation

Description

Illustration

Sticking (and

The SVLAN tag is stuck (and

Data

Data

S-VLAN

stripping) the

stripped) based on thr port.

SVLAN tag

Sticking (and

The SVLAN tag is stuck (and

Data

C-VLAN

Data

C-VLAN

S-VLAN

stripping) the

stripped) based on the port

SVLAN tag

and CVLAN.

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Operation

Description

Illustration

Transparently

The CVLAN tag is

Data

C-VLAN

Data

C-VLAN

transmitting the

transparently transmitted.

CVLAN tag

Transparently

The SVLAN is transparently

Data

S-VLAN

Data

S-VLAN

transmitting the

transmitted.

SVLAN tag

Switching the

The CVLAN tag is switched

Data

C-VLAN1

Data

C-VLAN2

CVLAN tag

based on the port.

Switching the

The SVLAN tag is switched

SVLAN tag

based on the port.

Data

S-VLAN1

Data

S-VLAN2

Transparently

The CVLAN+SVLAN tag is

Data

C-VLAN

S-VLAN

Data

C-VLAN

S-VLAN

transmitting the

transparently transmitted.

CVLAN+SVLAN

taga

Switching the

The SVLAN tag is switched

Data

C-VLAN

S-VLAN1

Data

C-VLAN

S-VLAN2

SVLAN taga

based on port+CVLAN

+SVLAN.

a: The EGSH board does not support this type of service.

Transit EVPL (MPLS) Service

Transit EVPL (MPLS) service is the service with MPLS tag switching and forwarding.

The service packets that are forwarded by the router should pass through the network that consists

of the OptiX OSN 8800 T32/8800 T64 equipment. To transparently transmit the service packets

that are transmitted from the PE router, the OptiX OSN 8800 T32/8800 T64 equipment create

an end-to-end tunnel on the PE routers. In details, the PE routers function as the ingress and

egress nodes, and the OptiX OSN 8800 T32/8800 T64 equipment functions as transit node.

5.5.2 QoS

Quality of service (QoS) defines the expected class of service, in terms of bandwidth, delay,

delay variation, and packet loss ratio, which should be guaranteed under all circumstances in a

communication network. This ensures that the request and response of an application meets the

expected class of service.

On a traditional IP network, all packets are treated the same way. Every router uses the first in

first out (FIFO) policy to process packets, and makes its best effort to transmit packets to the

destination; however, packet transmission performance, such as reliability and delay, are not

ensured.

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