optix rtn 600 networking and protection

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Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

OptiX RTN 600 Networking and

Protection


Study Guide

Before the study on this course, you are supposed to: Complete the study on the Digital Microwave Communications Pri

nciples or have the relevant knowledge. Complete the study on the course OptiX RTN 600 Introduction. Have the general networking knowledge of the SDH optical transm

ission network.


References

OptiX RTN 600 Product Description and OptiX RTN 600 Hardware Description in the OptiX RTN 600 Package of Documents

Digital Microwave Communications Principles


Training Purpose

Upon completion of this course, you will be able to: Describe the network application of the OptiX RTN 600.

List the common networking modes of the OptiX RTN 600.

List the service types and protection schemes supported by the Op

tiX RTN 600.

Describe the configuration requirements of the OptiX RTN 600 on e

ach protection scheme.


Table of Contents

1. Network Applications and Networking Modes of the OptiX RTN 600

2. Service Protection and Equipment Protection Schemes of the OptiX RTN 600


Network Application

The OptiX RTN 600 radio transmission system is a short haul digital microwave transmission system. Each radio frequency (RF) carrier of the RTN 600 system can transmit 4/8/16xE1 or 1xSTM-1 on the 7 GHz-38 GHz RF band.

The system provides multiple service interfaces, and it can be flexibly configured and easily installed. It can form the transmission network with the optical transmission equipment at the access layer, and can also provide backhaul links in a mobile telecommunication network or a private network.


Microwave Station Type Classified by Station Type

Terminal station: It refers to the microwave station that transmits services only in one direction.

Relay station: It refers to the microwave station that transmits services in two directions and is required added to solve the problem existing in the microwave line of sight communication. The relay station is classified into two types, active relay station and passive relay station.

Add/Drop relay station: It refers to the microwave station that transmits services in two directions and adds/drops transmitted services.

Pivotal station: It refers to the microwave station that transmits services in three or more than three directions and transfers the services in transmission channels in different directions. It is also called the HUB station.

Classified by Transmit and Receive Frequency

Primary station: the transmit frequency is higher than the receive frequency, also named high station.

Non-primary station: the transmit frequency is lower than the receive frequency, also named low station.


Microwave Station Type (cont.)

Terminal station

f 1’

Terminal stationPivotal

station

Relay station

Relay station

Terminal station

Primary station

Non-primary station

f 1

f 1’

The Primary station and the Non-primary station are usually arranged alternately in the double-frequency radio link.

Primary station

f 1 > f 1’

f 1


Microwave Station Type (cont.) Typical configuration of the OptiX RTN 600 as the Terminal Stat

ion

Typical Configuration of the OptiX RTN 600 as the Relay Station

slot20 PXC slot3

PXC slot1PH1 slot4SCC slot2

IF1A slot7IF1A slot5

slot8SL1 slot6

SLE slot3PXC slot1

IF1A slot4SCC slot2

SLE slot3PXC slot1

IF1A slot4SCC slot2

Cable

SL1 slot3PXC slot1

IF1A slot4SCC slot2

slot20 PXC slot3


IF1A slot7IF1A slot5

slot8slot6


Microwave Station Type (cont.)

Typical Configuration of the OptiX RTN 600 as the Pivotal station

slot20 PXC slot3


IF1A slot7

IF1A slot5

IF1A slot8

SD1 slot6

slot20 PXC slot3


IF1A slot7

IF1A slot5

IF1A slot8

IF1A slot6


Microwave Network Topology The following figures show the basic topologies of the microwave

network.

Ring networ

k

Ring networ

k

Chain networ

k

Chain networ

k

Star networ

k

Star networ

k

Tree networ

k

Tree networ

k


Applications of the OptiX RTN 600 Applications in the Backhaul Network of the Mobile Base Statio

n Terminal station in the mobile backhaul network Mobile backhaul chain network Mobile backhaul tree network

Applications in the Access Network and Private Network Microwave access network Complementary network to the SDH ring network Ring network formed by microwave equipment and SDH equipme

nt Ring network purely formed by microwave equipment


Applications of the OptiX RTN 600 (cont.) Applications in the Backhaul Network of the Mobile Base Station

Terminal station in the mobile backhaul network

Mobile backhaul chain network

Mobile backhaul tree network


Applications of the OptiX RTN 600 (cont.) Microwave Access Network

VIP client

Service center

Businesscenter

Other client


Applications of the OptiX RTN 600 (cont.) Complementary Network to the SDH Ring Network

Radio link

Radio link Radio link


Applications of the OptiX RTN 600 (cont.) Ring Network Formed by Microwave Equipment and SDH Equipment

User network

User network

User network

User network

User network

User network

User network

Transmission network


Applications of the OptiX RTN 600 (cont.) Ring Network Purely Formed by Microwave Equipment

User network

User network

User network

User networkUser network

User network

User network

Transmission network


Questions

How many microwave station types can be configured on the OptiX RTN 600? What are them?

Does an OptiX RTN 610 can be set as relay station? Why?

List out four applications of the OptiX RTN 600 in the transmission network.


Table of Contents

1. Network Applications and Networking Modes of the OptiX RTN 600

2. Service Protection and Equipment Protection Schemes of the OptiX RTN 600


Service Protection and Equipment Protection Schemes of the OptiX RTN 600 The service protection and equipment protection scheme

s provided the OptiX RTN 600 are as follows: 1+1 Hot Stand By (HSB) protection Microwave 1+1 Space Diversity (SD) protection Microwave 1+1 Frequency Diversity (FD) protection Sub-network connection protection (SNCP) Cross-connect and clock unit (PXC) active/standby protection


1+1 HSB Protection

Standby

Main

Service access unit

Cross-connect unit

IF unit ODU

ODU(mute)

• In the normal state

Standby

Main

Cross-connect unit

ODU(mute)

ODU

Antenna

• In the switching state

• The microwave HSB protection is also called the hot standby protection.

Service access unit

IF unit

IF unit

IF unit

Antenna


1+1 HSB Protection (cont.)

The 1+1 HSB protection can provide protection for the equipment when the IF board or the ODU failed.

The conditions triggering the 1+1 HSB protection switching include the ha

rdware fault of the IF unit, the hardware fault of the ODU, R_LOS, MW_L

OF, R_LOC, R_LOF and MW_RDI.

The service interruption time of the 1+1 HSB protection switching is less t

han 1s.

Only the OptiX RTN 620 supports the 1+1 HSB protection.

The ODU must use the same sub-band and type of the Primary and Non-

primary stations.

Only one antenna need be used at one station.

Two IF boards need not be configured in the paired slots.


1+1 SD Protection

Standby

Main

Service access unit

Cross-connect unit

ODU

ODU(mute)

• In the normal stateIF unit

Standby

Main

ODU

ODU(mute)


Antenna

Service access unit

Cross-connect unit

IF unit

IF unit

IF unit

Antenna

Antenna

Antenna


1+1 SD Protection (cont.) Because of the multi-path fading, the 1+1 SD installing the main and stan

dby antennas in different positions to protect the transmission channel. The conditions triggering the 1+1 SD protection switching include MW_LO

F, R_LOS, R_LOC, R_LOF, MW_FECUNCOR, and B1_SD (when the IF working mode is the PDH)/B2_SD (when the IF working mode is the SDH).

The 1+1 SD protection switching does not affect the services. Only the OptiX RTN 620 supports the 1+1 SD protection. The ODU must use the same sub-band and type of the Primary and Non-pri

mary stations.

Two antennas must be used at one station.

Two IF boards must be configured in the paired slots.


1+1 FD Protection



Standby

Main IF unit

IF unit

f1

f2

Cross-connect unit

Service access unit

Antenna

ODU

ODU

Standby

Main

Service access unit

Cross-connect unit

ODU

Antenna

IF unit

IF unit

f1

f2

ODU


1+1 FD Protection (cont.) The 1+1 FD uses the fading feature diversities between the signals of different

frequencies in the space transmission to protect the active and standby channels in the microwave transmission.

The conditions triggering the 1+1 FD protection switching include MW_LOF, R_LOS, R_LOC, R_LOF, MW_FECUNCR, B1_SD (when the IF working mode is the PDH), and B2_SD (when the IF working mode is SDH).

The 1+1 FD protection switching does not affect the services. Only the OptiX RTN 620 supports the 1+1 FD protection. The ODU must use different sub-bands and types at the same station. Two or one antenna (the hybrid coupler must be used) can be used at one stat

ion. Two IF boards must be configured in the paired slots.


Summary of the Microwave Protection Schemes

Protection

Scheme

Configuration Requirement Switching Condition Service

Interruptio

n

Switchin

g Point

1+1 HSB In general, one antenna is used.

There is no special requirement on the paired slot.

The sub-band of the main and standby ODUs must be the same.

Hardware fault of the IF unit and ODU unit, MW_LOF, R_LOS, R_LOC, R_LOF and MW_RDI

The service interruption time is less than 1s.

Cross-connect unit

1+1 SD Two antennas must be used. There is the requirement on t

he paired slot. The sub-band of the main an

d standby ODUs must be the same.

The conditions triggering the 1+1 SD protection switching is the service fault.

In this case, the MW_LOF, R_LOS, R_LOC, and R_LOF are not counted as the conditions triggering the HSB switching.

The services are not interrupted.

IF unit

1+1 FD One or two antennas can be used.

There is the requirement on the paired slot.

The sub-band of the main and standby ODUs should be different.

The condition triggering the 1+1 FD protection switching is the service fault.

In this case, the MW_LOF, R_LOS, R_LOC, and R_LOF are not counted as the conditions triggering the HSB switching.

The services are not interrupted.

IF unit


SNCP SNCP stands for the sub-network connection protection. The protection is performed whe

n the signal fail or are degraded. SNCP adopts the 1+1 single-end switching and does not require the support of the protocol.

The conditions triggering the higher order SNCP include R_LOS 、 R_LOF 、 MW_LOF 、 MW_LIM 、 MS_AIS 、 B2_EXC 、 R_LOC 、 AU_AIS 、 AU_LOP 、 HP_LOM . The optional conditions triggering the higher order SNCP include HP_TIM, HP_UNEQ, B3_EXC and B3_SD.

The required conditions triggering the lower order SNCP include the TU_AIS and TU_LOP. The optional conditions triggering the lower order SNCP include the LP_TIM, LP_UNEQ, LP_SLM, BIP_EXC, and BIP_SD.

The service interruption time in the SNCP switching is less than 50 ms. The source board in an SNCP pair must be the line board or the IF board. If the IF board is configured in one 1+1 protection group, it cannot be configured as the so

urce board of one SNCP pair.


SNCP (cont.)

Active Standby

Selective receiving of services

Bidirectional transmission of services

A

B

C

D

The SNCP is shown in the following figure. Services are transmitted

bidirectionally at NE A. The path that passes through NE B is the active path.

The path that passes through NE D is the standby path. In the normal state, NE C selectively receives the services from the

active path. In the switching state, NE C selectively receives the services from the

standby path.


PXC Active/Standby Protection In the normal state, the active and standby PXC work in the hot standby mode.

When the active unit is abnormal, the standby unit replace the original active one to providing the cross-connect and clock functions to the entire system.

The conditions triggering the PXC active/standby protection include the loss of the 38M system clock and the hardware failure.

The conditions triggering the situation that the service unit selects the PXC include loss of the system clock, loss of the service frame header, loss of the overhead clock, and loss of the overhead frame header.

The service interruption time in the PXC active/standby switching within 50 ms.

Only the OptiX RTN 620 supports the PXC active/standby protection. When the slots 1 and 3 are both configured with the cross-connect and clock board PXC, this protection is automatically enabled.


PXC Active/Standby Protection (cont.)

Cross-connect and clock unit

1

Service unit

3

Service signal

Service signal and clock signal

Service signal

Clock signal


1

3


Service unit



Clock signal

Service signal

Service signal Cross-connect and clock unit

Service signal and clock signal


Summary

Service and Equipment Protection Schemes Supported by the OptiX RTN 600

1+1 HSB protection 1+1 SD protection 1+1 FD protection SNCP protection Cross-connect and clock unit 1+1 hot standby

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