基于OSU的M-OTN组网模式与现网试验

doi:10.11959/j.issn.1000-0801.2023124

Abstract

Abstract:

The innovative optical service unit (OSU) based on M-OTN technologies can provide high-quality private line services with low latency and flexible bandwidth, and improve the networking capability and efficiency of OTN for small granularity services.The application mode of M-OTN/OSU technologies in the OTN were discussed, including the value OSU brings, the comparison of Overlay vs.Underlay networking modes, multiplexing modes of OSU into ODUk and multi-service unified transport.The service capability and long-term operational reliability of OSU technology were fully verified through the field trial network, which provides a technical basis for the selection of OSU networking modes.

Key words: M-OTN, OSU, networking mode, field trial

CLC Number:

TN914

Ruiquan JING, Leiyang SHEN, Zhiwei JIN, Jing ZHANG, Yuan YAO, Lei CHENG, Heng ZHOU. OSU based M-OTN networking modes and field trial[J]. Telecommunications Science, 2023, 39(6): 139-148.

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References 18

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对比项	PeOTN承载专线	OSU承载专线
10 Gbit/s以下以太网业务承载方式	多种承载方式，维护管理较复杂EoO（Ethernet over ODU）：ODU0/ODU1/ODUflex/ODU2 EoSoO：VC12/VC3/VC4	OSU统一承载
低时延特性	VC-12 承载的 EoSoO 业务时延大，低时延业务只能采用VC3/VC4/ODUk承载	对于450 Mbit/s以下的业务，与EoSoO方式相比，设备时延降低10%～50%
带宽调整	EoO：1 Gbit/s以上采用ODUflex调整（业务有损）；1 Gbit/s以下通过端口限速实现（业务无损，带宽利用率低）	OSU 无损带宽调整：n×2.5 Mbit/s 调整粒度，秒级调整，带宽利用率高
	EoSoO：按承诺客户的最大带宽配置 VC 管道，端口限速（业务无损，带宽利用率低）；调整虚级联 VC 数量（业务有损）

对比项	Underlay组网模式	Overlay组网模式
厂商锁定	是，受限于少数大厂	否，接入型设备可选厂商多^[15]
新特性引入能力	核心、汇聚层设备以专用集成电路（application specific integrated circuit，ASIC）方式为主，不便于引入新特性	接入型设备以现场可编程门阵列（field-programmable gate array，FPGA）方式为主，便于引入新特性
设备形态和功能	一台设备要同时支持 ODUk 大带宽交叉和VC-n/OSU/EoO小颗粒业务交换处理，设备形态和功能复杂，升级演进成本高	核心汇聚层OTN设备负责ODUk大带宽调度，OSU对接点和汇聚点设备负责 OSU 调度，明确区分设备功能，便于分别升级和技术演进
网络投资	需要配置新的OSU线路板卡和100 Gbit/s波道，初期投资大	可充分利用现网OTN链路资源，初期投资小
网络管理方式	维持现有网管方式	需要对现网 OTN 设备和旁挂接入型 M-OTN 设备分别进行管理，对统一网管能力要求高
核心节点OSU容量	3.2～6.4 Tbit/s	～400 Gbit/s
适用场景	业务量大、现网链路利用率较高的本地网	业务量较小、现网链路利用率不高的本地网；
		核心汇聚层OTN设备不支持OSU的场景

对比项	单级复用（OSU→ODUk）	两级复用（OSU→ODUj→ODUk）
接口多业务承载能力	只支持OSU承载的业务	同时支持OSU和ODU承载的业务
组网能力	逐点OSU交叉处理	支持ODUj穿通
接口支持的最大OSU数量（理论值）	4 000	N×4 000，N为接口支持的低阶ODUj数量
时延性能	两级复用与单级复用相比，每跳单向时延增加8 μs以下（相当于增加约1.6 km的光纤）

业务带宽/（Mbit·s^-1）	EoOSU	EoSoO	EoO
10	4×RPB	5×VC-12	/
50	20×RPB	25×VC-12	/
100	40×RPB	1×VC-4	/
400	160×RPB	3×VC-4	ODU0
1 000	400×RPB	/	ODU0
2 500	1 000×RPB	/	ODUflex （2×1.25 Gbit/s）
5 000	1 999×RPB	/	ODUflex （4×1.25 Gbit/s）

OSU based M-OTN networking modes and field trial

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