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Huawei OptiX OSN 3500. Technical Manual - part 3

Board

Slots

Interface

available(80G

available(40G

type

Cooperating

Board

Full name

cross-connect

board

capacity)

OU08

8 × STM-1 optical

SLOT19/21/23/25/

Not support.

SC, LC

SEP1

interface board

29/31/33/35

EU04

4 × STM-1 electrical

SLOT19/21/23/25/

SMB

SEP1

interface board

29/31/33/35

TSB8

8 × PDH interface

SLOT19/20/35/36

None

EU08 and SEP1,

switching & bridging

or D34S and PD3

board

TSB4

4 × PDH interface

SLOT19/35

None

MU04 and SPQ4,

switching & bridging

EU04 and SEP1,

board

or D34S and PL3

D34S

6 × E3/DS3 PDH

SLOT19/21/23/25/

SMB

PD3

interface switching

29/31/33/35

board

C34S

3 × E3/DS3 PDH

SLOT19/21/23/25/

SMB

PL3

interface switching

29/31/33/35

board

D75S

32 × 75Ω E1/T1 PDH

SLOT19/20/21/22/

DB44

PQ1

interface switching

23/24/25/26/29/30/

board

31/32/33/34/35/36

D12S

32 × 120Ω E1/T1 PDH

SLOT19/20/21/22/

DB44

PQ1 or PQM

interface switching

23/24/25/26/29/30/

board

31/32/33/34/35/36

D12B

32 x E1/T1 Interfaces

SLOT19/20/21/22/

DB44

PQ1 or PQM

Board

23/24/25/26/29/30/

31/32/33/34/35/36

ETF8

8 x 10/100M Ethernet

SLOT19/21/23/25/

RJ-45

EFS0

twisted pair interface

29/31/33/35

board

2-7

3 Protection

3.1 Equipment Protection

The OptiX OSN 3500 supports the following protection schemes at equipment level:

1:N TPS for processing board

1+1 hot backup protection for cross-connect unit and timing unit

1+1 hot backup protection for SCC unit

1+1 hot backup protection for power input unit

1:N protection for the 3.3V board power supply

Intelligent fans, with rotational speed automatically adjusted

Abnormality-specific service protection

3.1.1 Protection for Processing Board

The OptiX OSN 3500 provides 1:N TPS for the boards: PQ1, PQM, PL3, PD3, SPQ4

and SEP1.

The E1/T1 service supports one group of 1:N (N ≤ 8) TPS.

E3/DS3/E4/STM-1 electrical service supports two group of 1:N (N ≤ 3) TPS.

The OptiX OSN 3500 supports three TPS groups of different types at the same

time.

3.1.2 1+1 Protection for Cross-connect Unit and

Timing Unit

The cross-connect unit and timing unit are provided by the GXCS/EXCS boards.

3-1

Protection

GXCS/EXCS boards employs 1+1 hot backup for protection of crossing unit and

timing unit at the same time. When the active crossing and timing units are in normal

working mode, the standby crossing and timing units are in standby working mode,

not engaged in cross-connection function of service, and not providing timing to the

system, while the setting and timing configuration of the cross matrix are completely

the same with the active units. When the standby units receive the information

indicating abnormal performance of the active units or a switching command is sent

by the NM, they will immediately take over the job of the active units, setting

themselves into the active working mode and sending out a switchover alarm.

3.1.3 Protection for SCC unit

The SCC unit of OptiX OSN 3500 is provided with 1+1 hot backup protection. The

standby SCC unit is in standby working mode when the active one is in normal

operation.

3.1.4 Protection for Power Supply System

The OptiX OSN 3500 can access two -48V DC working power supplies through the

two PIU boards. If either one of them goes faulty, the other one will operate to ensure

the normal operation of the equipment .

3.1.5

1:N Protection for 3.3V Board Power Supply

The OptiX OSN 3500 provides 1:N power protection for other 3.3V board power

supplies through the power backup unit of the AUX board. When failure occurs to the

board power supply, the backup power will take over the power feeding job to ensure

normal operation of the boards.

3.1.6 Intelligent Fans

For heat dissipation, the OptiX OSN 3500 adopts three intelligent fans, whose

rotational speeds can be adjusted freely. The power supplies for these three fans

serve as backup for each other. With the fan failure detection function, once one of the

fan modules goes faulty, the other two will operate at their full speeds. The running

status of the fans can be indicated by the corresponding indicators on the front panel.

3.1.7 Abnormality-Specific Service Protection

1. Power failure in software loading process

Application program and data have the check function. In the case the loading is

interrupted, the BIOS will not start the unfinished program and data until they are

successfully loaded.

2. Providing over-voltage and under-voltage protection

The power board is designed with a lightning protection mechanism to effectively

reduce the damages that may be possibly caused by transient high-voltage such as

lightning. When the voltage is over low, this board will automatically reset the Center

3-2

Protection

Processing Unit (CPU). The software will re-initialize the chips. The software will

provide a mirror protection on important memories that may affect the services. In the

case the voltage is not stable, which results in memory value changes, the values can

be recovered to normal. In addition, when the voltage is too low, the power system will

automatically cut off the active power to protect the system.

3. Providing board temperature check function

Temperature detection circuit is provided on boards that generate more heat. When

the ambient temperature detected is too high, an alarm is generated to remind the

maintenance personnel to clean the fans.

3-3

Protection

3.2 Network Level Protection

3.2.1 SDH Trail Protection

For the OptiX OSN 3500, trail protection may occur at either the multiplex section (MS)

or the path in the modes of linear MSP and multiplex section protection (MSP) ring.

1. Linear MSP

Linear MSP is mainly used in linear networking topology. The OptiX OSN 3500

supports 1+1 and 1:N (N ≤14) protection schemes in the point-to-point linear

networking topology. In the 1:N protection mode, additional services are supported to

be transmitted on the protection system. In the linear MSP scheme, the switching time

is less than 50ms as specified in ITU-T Recommendation G.841.

2. MSP ring

The OptiX OSN 3500 supports shared optical path protection of two MSP rings. That

is, it supports two MSP rings on one optical interface.

The OptiX OSN 3500 supports 2-fiber MS shared protection ring, with the switching

time less than 50ms, as specified in ITU-T Recommendation G.841.

Moreover, in line with ITU-T Recommendation G.841, the OptiX OSN 3500 supports

4-fiber bidirectional MS shared protection ring comprising ring switching and span

switching. It other functions are similar to those of the 2-fiber bidirectional MSP.

3.2.2 SDH SNCP

The support of OptiX OSN 3500 to SNCP is fully in line with the requirements

stipulated in ITU-T Recommendation G.841. Even multiple service switching events

occur at the same time, the switching time can still be less than 50ms.

3.2.3 Protection for Interworking Service on

Rings

When there are more than one interworking routes existing between the rings,

inter-ring service protection can be enabled. For two rings in Dual Node

Interconnection (DNI) mode, ITU-T Recommendation G.842 specifies the protection

scheme for interworking services in rings with different protection schemes (such as

SNCP or MSP). The support of the OptiX OSN 3500 to the DNI mode fully conforms

to the requirements of ITU-T Recommendation G.842.

3.2.4 Fiber-shared virtual path Protection

The SDH network protection mechanism specified by ITU-T is primarily based on ring

networks. As for the mesh networking mode, definitely they fail to enjoy satisfactory

protection modes, as they cannot be detached into a series of optical ring networks.

By virtue of features of the OptiX series products, together with the in-house

3-4

Protection

developed SDH cross-connect chips and powerful higher-order and lower-order

cross-connect matrix, Huawei promotes a ring networking mode based on the path

layer. That is, the protection for ring networks is based on higher-order or lower-order

paths. From this point of view, the mesh network can be considered as overlapping of

ring networks comprising various paths. Once independent protection for respective

paths can be provided, the service on the whole mesh network can be protected

accordingly.

3-5

4 Networking

4.1 Application of Basic Service

Chain and ring are two basic structures of the transmission network. Various

complicated network structures can derive from them in practice, as shown in Table

4-1.

Table 4-1 Basic service application

Networking

Topology

mode

Chain

Ring

Tangent rings

4-1

Networking

Topology

mode

Intersection

rings

Ring with chain

DNI

Hub composed

of ring and

chain

MADM

ADM

Legend:

4-2

Networking

4.2 Application of Ethernet Service

With the capability of accessing Ethernet service integrated into the SDH platform, the

OptiX OSN 3500 can transmit both the voice service and data service. The OptiX

OSN 3500 supports service convergence and L2 switching, as well as the VLAN

function specified in IEEE 802.1Q. It also supports the L2 VPN service. With the

special frame format, the OptiX OSN 3500 can be deployed in the fields such as

MPLS, VLAN and L2 MPLS VPN, satisfying the user’s requirements for private line

and network.

1. Transparent transmission of the point-to-point Ethernet service in the

chain

The OptiX OSN 3500 can be deployed in the chain network for point-to-point

transparent transmission of the Ethernet services, as shown in Figure 4-3. In this

figure, service A is transparently transmitted from Ethernet Port 1 of NE1 to Port 1 of

NE3, passing through VC-Trunk A. Service B is transparently transmitted from the

Ethernet Port 2 of NE1 to Port 1 of NE2, passing through VC-Trunk B. The services A

and B can be of either FE service or GE service.

VC-Trunk A

NE1

NE2

NE3

Port 1

Port 2

Port 1

VC-Trunk B

Figure 4-3 Point-to-point transparent transmission of Ethernet service (in a chain)

2. VLAN convergence of Ethernet service in the chain

Supporting the VLAN function specified in IEEE802.1Q, the OptiX OSN 3500

provides private network service. It performs flow classification to services according

to the Ethernet port and VLAN ID. Up to eight IEEE802.1P-compliant priorities can be

set according to the flow classification result. The OptiX OSN 3500 isolates services

of different users through VLAN to achieve security purpose. As shown in Figure 4-4,

VLAN 1 and VLAN2 of Company A share VC-Trunk 1 with VLAN 2 of Company B,

and the services on VLAN 1 of Company B are transmitted through VC-Trunk 2.

4-3

Networking

VLAN 1

VLAN 2

Company A

VC-Trunk 1

Lanswitch

VLAN 1

NE1

NE2

NE3

Port 1

Port 2

VLAN 2

Port 2

Port 1

VC-Trunk 2

Port 3

Lanswitch

VLAN 1

VLAN 2

VLAN 1

VLAN 2

Company B

Figure 4-4 Port and VLAN-based flow classification and convergence (in a chain)

3. Transparent transmission of the point-to-point Ethernet service in the

ring

In the ring networking application, as the Ethernet service is provided with a perfect

SDH self-healing ring (SHR) protection scheme, its reliable transmission is

guaranteed. As shown in Figure 4-5, the Ethernet services of different nodes are

transmitted to the destination node through their respective VC-Trunks.

NE 4

NE 1

SHR NE 3

NE 2

VC Trunk

Figure 4-5 Point-to-point transparent transmission of Ethernet service (in a ring)

4. VLAN convergence of Ethernet service in the ring

The Ethernet service accessed at different nodes can be converged to one node and

sent to a certain port for transmission as required. As shown in Figure 4-6, flow

classification is performed to the Ethernet service according to the port and VLAN ID

to distinguish different VLANs that Company A and B belong to respectively. Up to

4-4

Networking

eight IEEE802.1P-compliant priorities can be set according to the flow classification

result. The OptiX OSN 3500 isolates services of different users through VLAN to

achieve security purpose. In the figure below, VLAN 1 of Company A shares a

VC-Trunk with VLAN 1 of Company B, and VLAN 2 of Company A shares a VC-Trunk

with VLAN 2 of Company B, and VLAN 3 of Company A shares a VC-Trunk with

VLAN 3 of Company B.

All services of Company A are converged to NE1 and output from an FE/GE interface

to Lanswitch for processing.

Headquarters of

Company A

Company B

VLAN 3

VLAN 1

VLAN 2

VLAN 1

VLAN 3

NE 1

VLAN 1

VLAN 3

NE 2

NE 4

VLAN 3

Branch

SHR

VLAN 1

NE 3

VLAN 2

VC Trunk

Branch

Figure 4-6 VLAN convergence of Ethernet service (in a ring)

5. L2 switching of Ethernet service

The OptiX OSN 3500 supports L2 switching of the accessed Ethernet data, which can

be transferred according to their destination Media Access Control (MAC) addresses.

For example:

As shown in Figure 4-7, respective LANs of Company A and B are connected to four

nodes. The Ethernet service between the nodes 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 L2 switching function provided by the OptiX OSN

3500 can be employed to solve such a problem. For example, an Ethernet MAC

address transfer table will be formed in the system when relevant settings are made to

NE3. With the self study function of the system, this table can be updated periodically.

Then, according to their destination addresses, the data of Company A and B

accessed at NE3 will be transmitted to their destinations via checking the transfer

table and selecting corresponding VC-Trunks or sharing the same VC-Trunk. By this

way, the system configuration is significantly simplified and the bandwidth utility is

4-5

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