How to Mapping OTN Client Services into ODUk Signals?

Introduction

The OptiX OTN product series currently include the OSN 6800/8800/9800. WDM equipment uses timeslots or standard mapping procedures to map signals into ODUk signals.When using timeslots, Huawei WDM equipment can aggregate multiple services at rates lower than 1.25 Gbit/s into one ODU0 signal, or multiple services at rates lower than 2.5 Gbit/s into one ODU1 signal. This function enables multiple services to share the same ODU0 orODU1 bandwidth.

When using the standard mapping procedures, the OptiX OTN product series directly maps signals into ODUk signals and supports flexible grooming of services.

Mapping Client Services by Using Timeslots

The OptiX OTN product series divides an ODUk (k = 0, 1) signal into several timeslots, each with a bandwidth of 155 Mbit/s, and it slices client services into 155 Mbit/s signal segments, each mapped into ODUk signals. The OptiX OTN product series can map multiple low-rate client services into one ODUk (k = 0, 1) signal, thereby improving bandwidth utilization.

The following services can be mapped into one ODU0 by OptiX OTNproduct series using timeslots: FE, FDDI, ESCON, SDI, DVB-ASI, FC100, and FICON. Figure 1 shows how FE/FDDI and ESCON/SDI/DVB-ASI services are aggregated into oneODU0:

Aggregating client services into one ODU0

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The following services can be mapped into one ODU1 by the OptiX OTN product series using timeslots: FE, FDDI, STM-1, OC-3, ESCON, SDI, DVB-ASI, STM-4, OC-12, FC100, FICON, GE, HD-SDI, FC200, and FICON Express. Figure 2 shows how GE, STM-1/OC-3, and FC100 services are aggregated into one ODU1:

Aggregating client services into one ODU1

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The number of timeslots varies according to the type of service. Below table lists the number of timeslots required by each service type.

Service Type Number of Timeslots
GE 7
FE 1
STM-1 1
STM-4 4
OC-3 1
OC-12 4
FC100 6
FC200 12
FICON 6
FICON Express 12
HD-SDI/HD-SDIRBR 11
DVB-ASI 2
SDI 2
ESCON 2
FDDI 1

Mapping Client Services by Using Standard Mapping Procedures

OptiX OTN product series can map client services without using timeslots. It can use standard mapping procedures to map client services directly into ODUksignals, as shown in below figure.

Mapping client services into ODUk

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