臼描国匿 葡面近 固 丝 堕垒
智能同步光网络与多业务传送
平台的应用
摘要：智能同步光网络(ASON)与多业务传送
平台 (MSTP)固其先进的智能性、可靠性、灵
活性而得以发展和运用。本文根据智能光网络
与多业务传送平台枝术的发展一情况，结合北京
通信传送网络的实际情况，探讨北京通信传送
网的建设思路
关键字：智能同步光网络；多业务传送平台；
外部网络节点互联协议
中图分类号(CI C number)：TN915 1 l
文献 标识码 (Document code)：B
文章编号(ArtiCIe ID)：
1 009—9336f2003)03．00 l 2-09
1 北京市通信公司传输网建设需求分析
北京通信传输网有朗讯 1、朗讯2、马可
尼、华为SDH传输网 (市区与郊区各设置一
个网络级网管)和PDH传输网。根据网络容
量 (包括今年要扩容后的朗讯2网，扩容后
的朗讯 2网已达到了骨干、汇聚、接八三层
平衡)和业务于干放数据统计、分析，不考虑
年增长率，可以满足2004年4月前业务发展
的需求。
北京通信现使用的三个厂商的sDH传
输网络，因都是过去几年中逐渐扩容形成
的，采用了各厂商不同时期的传输设备，在
设备八网封，大郡必须 网络进行升级，
每次升级时司约为3周左右，在升级过程中
都或多或少地影响了业务的开通工作，给市
I2
AppIications of ASON and MSTP
任光伟 REN Guang—we
(北京市通信公司 垫局 北京 1 oo0 0 2
Networ~~u rsau of Beijing Commu．fcation eo rporalion．Beijlng 100032．China
Abstract：ASON and MSTP are well developed and widely used
fomtheiradvallcedintelligence，teliabilit5,andflexibility Tbe papelwill
discuss all approach for the construction of BeijitN Coolmullication
Corporation S transmission network based on the status ofASON
Key words：Automatic Switching Optical Network；Multi—Service
Tmnsmission PlatfonTl：Exlro Network Node lntefface Protoco1
1 Demand analysis of construction of Communica
tion Corporation(BCC)‘s transmission network
There are Lucent I＆2 Marconi．Huuwei SDH transmission
network，where one network—class network man agement is installed
in urban and stlbt,rb T_especlively，and PDH transmission network
Given annual gl_owth rute is not taken into consider it will sarisfy
demand of service development until ApTil 2lD4 bused on statistics
and analysis of network capacity and service open data Network ca—
pacity includes post·capacity—expansion Lucent 2 Network．which will
bc expanded this yem and get balance zunong backbone，convergence
an d access layers．
At present BCC is using SDH trallsmission uetwol’ks from thme
dill'erentmanufactures．whichiscuusedbyadoptingtlarlSOlission equip
ment rroIn different phases ofeach]nanu~lCttlre dllt‘ing capacity—ex—
pansion in past years So most networks need upglade when new
equipment intruduced into the network It COSTS almost three weeks
Ibr upgmde each time，which will aflbct tire open of sel’vice nlore OI
less and bring bad influence for the market exploit．business develop—
维普资讯
TOPICS OF MAJOR INTE
—
RE
—ST匦 圈商国暇
ltlen【and network nlan)tenatlce
In addition，PDH transmission netv,,ork has nln for a few long．,and
has no function(】r link protection，so its loaded sel。vices．which are
mostly used by BCC itselL v,,ill be gradually to SDH network．Consid—
ClingthereisI1{／red)redan)capacity'ofSDHnetwork FIOW．PDH equip—
me)it could not be en01ely excluded from nc|work
Accolding reasons we discussed above．it is enlergent for BCC
to build a new transmission network Only when prophase work of
netwolk construction stars nov,'．and the new transnlission network ls
completed in the early of2004，could it meet the demand oftransmis—
sion services aftel 2004
2 Development direction of transmission equipment
technology
Technologyoft)ansmission equipmentisdeveloping veWquickly．
Technologies of ASON and MSTP are the tv,'o most dazzling stars
among them
2 1 ASON
As telecoulm services develop very quickly demand oftransmis—
sion bandwidth also increases To meet the devek)pment of transmis—
sion service．mld『1vmanufactul'eSbegindeveloping andproducingtrans—
mission equipment with multi—optical port and strong crossing
capability．and put thunl into commercial application quickly Band—
widthm,'magement．BMW．fromLucentisthiskindofproduct．Alcatel
andSiemens alsoproduce similarproducts rhiskindofproduct adopt
traditional control technology of SDH equipment and structure of
chlstel’Crossmachine，whichhas huge bulk Im'gepowerconsunlption，
un—flexible protection mechanism and expensive maintenance cost
So it gradually lost its mm'ket Lucent h stopped product of BW M
and turn to product ofnew—generation integtated ASON equipment
with intelligence tcchnnlogy Othe r nlan Lifactures of transmission
equipment also put their emphases on developmentofASON
ASON intl+oduces technology of route control，as well as inherits
the merits of cross capability of huge capacity and multi—poct from
multi—optical poll equipment Thus it becomes true intelligent trans—
mission equipment Stand—alone cross—connection capacity ofASON
node eqnipntenl is generally about 640 Gbiffs W hile it is sometime
320 Gbiffs with some manufaClUl~ and()6()Gbiffs with other It is
able to reach sevelaI T cross—connection after extension
ASON adopts optical signaling route protocol Optical signaling
场开拓、义务发展韧网络维护工作带来了负
面影响
另外，PDH传输网因使用对司较长，且
不具备链路保护功能，其所承载的业务 (主
要是北京通信自用)在今后几年需逐步害 接
到SDH传输觋中。现在只是考虑现驾 SDH
网容量不足，不能彻底将 。：：} 设备返网。
基于上述原因，北京通信建立新传输网
约工作已迫在眉睫。只有现在开始进行建网
前期工作，在2004年初建成新的传输网，才
能满足2004年以后的传输业务需求。
2 传输设备的技术发展方向
传输设备日譬技术发展日新月异，近几年
最引人注目的是智能光网络与多业务传送平
台技术
2．1 智能光网络技术
通信业务发展十分迅速．传送带宽需求
也日益增长。为适应传送业务的发展．很多
设备制造商开发生产大交叉能力的多光口传
送设备，而且得以迅速商用 朗讯公司匏带
宽管理设备 (BwM)就是这类产品。阿尔卡
特、西门子等公司都有类似产品 这类产品
采用的是传统的 sDH设备整制技术与集群
交叉机结构，设备钵职庞大 功耗高、保护
机制不灵活、维护成本高，便其逐渐失去市
维普资讯
圈圈国匿 五面 撵 应
场。朗讯公司已停止了BWM的生产，而转八
新一代集成的、采用智能技术的ASON设备
的生产。其他传输设备制造商也将开发重点
放在了智能光网络方面。
智能光网络继承了多光口设备的大容量交
叉能力和多种端口的优点，芦引八了路由控制
技术，使之成为真正的智能传送设备 智能光
网络节点设备鱼机交叉连接容量一般在640
Gbit／s左右 (有的厂家为320 Gbit／s，有的厂
家为960 Gbit／s)。通过扩展可达几个太比特
的交叉连接能力
智能光网络采用了光信令路由协议。光
信令路由协议为分布式协议，内置于网络设
备控制模块中，是快速网格恢复技术的关
键 光信令路由协议分成路由协议、信令协
议两个主要部分，用于联网的智能光网络节
点设备之 司共享网络拓扑、自动寻找路由、
配置号路。路由协议的主要功能为网络相邻
节点的发现，网络拓扑信息分发，路由信息
分发，路径选择优化的计算，使每 个网元
都知道整个网络的网络拓扑和链路状态。信
令协议的主要功能是寻找路由，建立、拆除
和恢复连接。
智能光网络继承了 sD 网的网络保护
机制，还具备了网状恢复和混合型网络保护
功能 SDH网的网络保护机制包括复用段保
护 (MSP)、子网联接保护 (SNCP)，复用
段共享环保护 (MS—SPqing)。通过网状恢
复功能，网络故障aⅡ可在几百毫秒内通过自
动重新建立路由，恢复业务，还可以指定业
务的优先级来区分网络故障情况下的业务恢
复优先级和恢复时间。混合型网络保护．是
在标准的sDH保护业务中增加快速网状恢
复功能，进一步提供被保护电路的安全性、
可靠性。
2．2 多业务传送平台技术
多业务传送平台技术是顺应传送业务综
合化需求而产生和发展的。传统的数据和传
输专业划分，主要体现在开放系统互连
route protocol is distributed protocol and embedded jn controI nlod—
ule ofnetwork equipment，which is the key ofquick gridding recovery
Optical signaling route protocol consists ofroute prntocol and sigual—
ing protoco1．which ale used for sharing network tolx~logy．automatic
looking for route and configuring circnit between online ASON node
equipment Major function ofroute protocol is to discover netghbor—
ing nodes of network，distribute information of network topology
and route，and calculate optimization of route selection．which enable
eachcell elementknownetworktopologyan dlink statnsofthewhole
network．While signaling protocolis charge oflookingfor route
． set—
ring u p-disconnecting and recovering connection．
ASON has functions ofreticulation recovery,and mixed network
protection，as well as inherits network protection mechan ism of SDH
network Protection mechanism of SDH network consists of MSP
SNCPandMS—SPRing With reticulation recovery,networkfanhcould
resunle service in several hundred of seconds through antomatically
re—selling up route It could'also classify PRI of service resume and
recovery time under condition of network fault through appointing
PRI to services Mixed network protection，which introduces quick
griddling recovery into standard SDH protection service，further pro-
vide security and reliability for protected circuit
22 MSTP
MSTP is born and developed as the result ofdemand oftransmit-
ling integrated service．Traditional data and transition are mainly enl—
bodied on seven—layer applications of OSI Transmission equipment
mostly USeSLayer I protocol ofOSI．Whiledata communication con—
sists all layers of OSI．For example，DDN uses Layer 1 protocol，FR
network adopts Layer 2 protoco1．ATM network uses Laym’2．5 pro—
tocol and router applies Layer 3 protocol Ofcourse，some data net—
works aJe constructed on transmission network．for example DDN
an d FR network ale but1t on trailsmission network
All carriers used to develop transmission nelwoik and data net—
work independently．which are caused by two t)lctors：one is specialty'
division：the other is that manufactulers produce transmission and
data equipment based on this division The divisinn forces telecomm
carriers to introduce transmission node equipment of voice and data
services(E1 LAN．DDN．FR，ATM and so on)into user terminals to
nleet diversity demand of transmission class service when the),want
to extend this kind Of service Network construction Ijke )1 al1 node
维普资讯
TOPICSOFMAJORINTEREST —圈强国髓
equipment of kinds of service are installed on user side will increase
investment ofequipment Considering save investment ofequipment，
optical fiber‘directly driven‘is adopted，which leads LAN or ATM
service to nser temfinals．adopts real—wire Modem to open DDN and
FR service，and adopts SDH to supply El ostly voice telay and El
private line)transmission service．
Facing integration demand oftransmission class service．both dam
equipment manufacturers and transmission equipment manufacturers
develop in the direction of equipment integration Traditional trans—
II1ission equipment manufacturers introduce Layer 2 even Layer 3
protocol ofOSI into equipment irtanufae03reⅥ bile data equipment
manufacturers also step into transmission equipment manufacture
industry All ofthem select MSTP
It experiencesfourgenerationforthedevelopmentofMSTP The
followinggivesthemainfeaturesofeverygenerationofMSTPindetails
2．2 1 1 G：Access Stage(A-ADM1
At access stage，MSTP equipment primarily supplies a multi—ser-
vice access platform．which adds broad bandwid山 on【he base of
existing SDH to realize transparent transmission ofdata tran smi ssion．
Forexample．itoffersEthemetinterfacetoimageEthemetdataframe
to SDH virtual container and resolve image at the other terminal to
realize point—to—point transparent transmission Or it provides concat—
enated interface for data telecomm equipment to access high-speed
interfaceofATM andpOS
MSTPat access stagehasawellcompatibilityofa'aditionaltrans—
mission network．whichinheritsmeritsoftraditionalSDH networkat
netw ork protection and network management．Because MSTP adopts
independent time slot channel ofTDM，it could ensure access data
service have severe QoS and entire security But MSTP at access
stagejust simply adds broad bandwidth on SDH extuipment．so it has
a weak capability at process ofdata service．which will consequen—
tially causes low utilization rate of network bandwidth and weak ca-
pability ofcapacity expansion
2 2 2 2G：Conve rgence Stage(C-ADM)
MSTP equipment at convergence stage add process function of
data serviceonthebaseofA—ADM，whichincludesLayer 2 switchof
Ethemet and盯 M switch and so on．
Because it adds process of service layer,that is Layer2，on physi—
cal layer，of SDH．data process capability Oil MSTP equipment gets
(OSI)的7个层面应用上 传输设备主要应
用了OSI的1层协议。而数据专业包含了0SI
的所有层面 如DDN应用的是1层协议，FR
网应用了2层协议，ATM网应用了2 5层协
议，路由器则应用了3层协议⋯一当然，有
些数据网是构建在传输网上的，如DDN、FR
网就是掏建在传输网上的。
以前各运营商均是独立发展传输网络与
数据网络的，这主要有两个原因，一是专业
划分的原因；另外，设备制造商也是按这个
划分方法来生产传输和数据没备的。这样
的专业划分方法，造成通信运营商在扩展
“传送类”业务时，为满足 “传送类”业务
的多样性需求，不得不将语音和数据的“传
送类”业务 (E1、LAN、DDN、FR、ATM
等)的传送节点设备分别引八到用户端。这
种将各种业务节点设备均安装在用户侧的
组网方法，加大了设备的投资。某些情况，
考虑节约设备投资，采用光纤 “直驱”，将
LAN或ATM业务引到用户端，采用实线
Modem开通 DDN、FR业务 ，采用 sDH
设备提供 E1(主要是语音中继和 El专线)
传输业务。
面对 “传送类”业务综合化需求，无论
数据设备制造商还是传输设备制造商，都向
设备综合化方向发展。传统的传输设备制造
商将 OSI的2层 (甚至3层I)协议引八设备
制造中；而数据设备制造商也步八到传输设
备制造业中 他们郡选择了多业务传送平台
(MSTP)技术。
MSTP技术的发展，有四代技术。下面
详细介绍一下MSTD各代技术的主要特点。
2，2．1 第一代：接入阶段 (A-ADM)
接八阶段的MSTP设备初步提供了一
个多业务接八平台，在原有SDH基础上增加
宽带接口，实现了数据业务的透明传输，例
如提供以太网接口将以太数据帧映射：~IJSDH
虚容器，在对端解映射实现点对点透传；为
数据通信设备提供级联接口接八 A T M 和
维普资讯
园囿国匿} 面¨_i 习 捞 腔
POS自9高速接口等。
接八阶段的MsTP技术具备良好的传
统传输网络兼容性，在网络保护、网络管理
等方面继承了传统SDH 5团络的优点，由于采
用TDM的独立 隙通道，能够保证接八数据
业务有严格的质量保证和彻底的安全性。但
是接八阶段的 Ms TP 技术只是简单地在
SDH设备上增添了宽带接口，所以对数据业
务的处理能力较弱，必然导致网络带宽利用
率低，容量扩展能力较差
2 2 2 第二代：汇聚
阶段 (C-ADM)
汇 聚 阶 段
M S T P 设备在 A
ADM的基础上瘩五[了
数据业务的处理功能，
包括以太网的二层交
换、ATM交换等
由于在SD rq的物
理层面上增加了业务层
(二层)的处理 MsTP
设备上的数据处理能力
得到增强，能够提供数
据业务的交换，如基于
以太网MAC地址的交
换、基于VLAN TAG
标 签 的 路 由 配 置 、
stronger It is able to supply switch ofdata service，such as Ethernet
MAC address-based switch，VLAN TAG label=based route configu—
ration and ATM switch，and able to supply convergence of center
port,serviceto saveportsofcenterequipmentandenable service stream
more flexible and capability of network—construction stronger But
MSTP at convergence stage still does not completely slip the]ee．sh of
packet sen,ice by traditional transmission equipment,where low utili—
zation l-ate of network bandwidth and weak capability of capacity
expansion still exit
2．2 3 3G：Sha red Stage(S-ADM)
ATM交换等．可提供中心点业务的汇聚以节
省中心设备盹端口，同时业务流向更加灵
活，组网能力有所增强 但是汇聚阶段的
MSTP技术并没有完全摆脱传统传输设备对
分组业务的束缚，仍然存在带宽利用率低，
网络容量扩展能力差的缺点
2 2 3 第三代：共享阶段 (B-ADM)
共享 段的 MSTP设备采用数据通信
领域逐点转发的环网技术，内嵌如弹性分组
环技术 (RPR) ATM芪享环技术 (VP
RING)，有效地提高了带宽利用率
在 s D H的物理层面上．共享阶段的
tlon rotation mad telecomm—class protection mech~mism on VP—RING
setwice layer．At present MSTP equipment with this|~ature has been
~plied and approved during network operation and its sh~ed feature
1s getting perle．ct
2．2．4 4G：lntelligence Stage(I-ADM)
Toenhance sense capabilityot。network equipmenton service amd
further strengthen capability of service allocation and network
interopemtion．MSTPwilldeveloptointelfigence stage．Traditional staUc
network will'also evolve to intelligent network which is lble to realize
networktolx~logy autonlutic recover．bandwidthaynmnicapplicationand
release and flexible and efficient protection ofMesh network and so on
MSTP keeps forward compatible and upgrade of management
～ 川～ m 一一 一 一～一～一一～一一～一一～一～一～ ～一一一一～一一一～一～一一一一一
维普资讯
TOPICSOFMAJORINTERF~T _3圈固囵暇
and control layer makes network have intelligence feature．Evolution
to intelligent network fl'onl static network will experience from static
to semi—static and senli—intelligence Io intelligence
At present．MS11P equipment frmn fnost nlLRlUfilcturers still stays
at 2G．and part of MSTP equipment stays at 3G u hich has case of
commercial application
Ma
．joi merit ol’equipment adopting MSTP is to l_educe general
investment oftransmission class equipment．improve security oftrans—
nlission network where access layei realizes double—router protection，
andincreaseintegrated LIlilizatiou rateel transnqission network Other-
wise 1t also brin~s an impulsion tom the nlaintenance mechanism ofcar-
riers to adopt MSTP equipment That is because MSTP equipment
makes an integration of traditional transmission and data technologies
and puts them into one network—management．which will bring part
inte~ationofhansmissionanddata specialtynlaintenance Anditmeans
not a small refoonforthemmntenancemechanianlofcm'riers
3 Commercial applications of ASON and MSTP
ASON and MSTP get rapid development for their advantages
USA AT&T selects ASON equipment from CIENA Company as its
backboneand convergence nodesoftransmissionplatform，and selects
MSTP eqniprnentfrom Cisco asi“service aCCeSS nodeoftransmission
platform In addition Bell lab has developed an integrated network nlan—
agementascontrollayel‘ofthewboletlansnl Jssion networkto SUCCUNS—
fiflly realize unitive managelnent of the whole transmission network
The networkwas completedinthe end of 2(101，and putinto commer
ci'A application al the b画nning of2002 Now'it has buih more tl1¨n one
hundred ASON backbone and convergence urges and several hundreds
【]rMS1_Paccess nodes Thisis a SLICCCSSfUI application ofASON and
M STP Its saccessfn]place is to introduce ASON at backbone and
convergence nodes，which improves quality of network and redtlces
COSt of investment and mahitenance．and select MSTP at access nodes．
which mdnces ilweshnent ofequipment improves flexibility ofnetwork
and supp]ies multi一~rvice Meanwhile u'adifionN SDH protection cbau—
nel is able to complete cooperation among Ihe whole network to con—
vuniently malize sin ,ice open and protection
The case above s about a successfu】network COllSUllctJnn．which
introduces control layer to complete a combination of ASON equip—
inen[from one iTlanLlfacU．ne and MSTP equipment ft．om the other
nlanufal2trlre In fact it is tbe similadty ofthe con~ol mechanism mnong
MSTp技术构建了业务层面完整的环网形态，
可提供网络带宽的统计复用，高效的接八数据
业务，带宽利用率高，网络容量扩展性好；并
可提供如RPR保护倒换与VP—PJNG等1Jl，务
层面电信级的保护机制。目前具备该特性的
VISTP设备已经在网络运营中得到了应用和验
证．其共享特性也正在不断完善。
2 2 4 第四代：智能阶段 (I—ADM)
为增强网络设备对业务韵感知能力，在
业务指配、网络互操作能力方面进一步增
强 MSTP技术将发展到智能阶段。传统的
静态网络也将向智能网络演逝．可实现网络
扑自动发现、带宽动态申谓和释放、Mesh
网灵活高效的t呆护等。
MSTP技术保持前向兼容，管理控制层
面 (软件)的升级使网络具备智能特性．静
态网络向智能网络的演进将经历静态到半静
态、半智能到智能的过程
目前大多数设备制造商的MSTP设备
处在第二代，一部分设备制造商的MSTP设
备处在第三代 (有商用实例)
采用 MSTP设备的主要优点是降低了
传送类没备的总投资，提高了传送网的安全
r-主(接八层实现了双路由保护)，增加了传送
网的整体综合利用率 但买用MSTP设备也
给运营商的维护体制造成了 中击 。因为
MSTP设备糨传统的传输韧数据技术融合在
一 起，且统一到～个网管中．这势必带来传
输和数据专业维护工作的部分融合 这对运
营商的维护体制是 个不小的变革
3 ASON与MSTP的商用情况
正是因为ASON与MSTP的优势．使其
得迅速发展。美国AT＆T公司采用CIENA公
司的ASON设备作为传送平台的骨干、汇聚
节点，采用Cisco公司的MSTD设备作为传
送平台的业务接八节点，而且刀尔实验室开发
了综合网管作为整个传送网的控制层面，成功
地买现了整个传送网的统 管理。该网从2001
年底建设，2002年初开始商用，发展到现在已
维普资讯
圈固国~ 2003No．3 I 茁
建立了1∞多个ASON骨干、汇聚节点，数百
个MSTP接八节点。这是将ASON与MSTP
成功应用的一个范例 其成功之处在于在骨
干、汇聚点弓用ASON芨术，提高了网络质
量，降低了投资和维护成本；而接八点采用
MSTP技术，降低了设备投资，增加了网络灵
活度，提供多业务，且其传统的 SDH保护功
能通过控制层面完成全网协同工作，方便地实
现业务开放与业务保护。
上面介绍的是通过引八控制层面来完成一
个厂家的ASON设备与另一个厂家的MSTP
设备成功组网约例子 事实上，正是因为
CIENA与Cisco两个公司设备控制机理的相
似性才得以实现全网的统一管理和控制。如昊
二个公司设备盹控制机理不相似，引八控制层
来管理全网几乎是不可能实现的。实际上，其
它设备制造商在自己的系列产品中，同样采用
引八控制层面来完成其ASON设备与 MSTP
设备的网络管理工作，如呵尔卡特等公司，只
不过他们融合管理的ASON设备与MSTP设
备来源于 个公司的不同子公司而已。
在构筑智能城域传送网时，需要的是
ASON加MSTP设备，因此设备制造商也郡
努力提供全系列产品，CIENA公司收购一家
制造MSTP设备的公司，通过开发控制层面，
完成了ASON与MSTP设备混合组网时全网
统 管理控制的融合 西、_子公司也收购了
生产ASON设备的SYCAMORE公司，并正
在进行控制层面的开发工作。开发工作已哥
续一年日 司，也可实现AS'ON与MSTP网络
管理的 合 而更多的公司如阿尔卡特、朗
讯、北电等都是自己开发 ASON产品，并且
实现其与传统 MSTP设备统一组网，通过控
制层面实现全网管控制的融合。
目前，CIENA、阿尔卡特、朗讯、北电、
西~-子等公司的 MsTP设备都有很多商用
的t列子 且他们的ASON设备都有不同的商
用案例，只不过商用数量和商用时间差别很
大，各公司的ASON设备商用情况可参见厂
equipment of CIENA and Cisco that makes it possible to realize the
integratedmanagement and controlthefull network Ifcontrolmecha-
nism ofequipment fi~om these two companies is not similar it is"almost
impossible to introduce control layer for managing the full network
Actually，other manul：acturers also introduces control layer to complete
network management ofASON equipment and MSTP exluipment in
their series ofplod ucts．such Alcatel The only difference is that
ASON equipment and MSTP equipment that they inte~'ated manage
comefi'omdifferent sub-companies whichbelongtothe samecompany．
When intelligent metropolitan area transmission network is
constructed，ASON and MSTP equipment is required．So equipment
manufacturers are ing to supply a full SCl'ies of products．CENA
Companyhaspurchasedacompany，whichmanufacturesMSTPequip—
men{and developed a control layer to compete integration of full—
network untied management and control when mixed network con—
struction of ASON and MSTP eqtfipment Siemens also purchases
SYCAMCORE Company，which produces ASON equipment，and is
carrying development of control layer The developmeut has lasted
f0rone yearanditwill also be ableto realizeintegration ofnetwork
management of ASON and MSTP W hile more companies such as
Alcatel，Lucent and Nortel develop ASON products by themselves，
realize unit]ed network construction with traditiona1 M S_rP and real—
ize integration of full—network management through control layer．
At present．all MSTP equipment from CIENA．Alcate1．Lucent，
NorteI and Siemens has lots of cases ofcommercial application And
theit'ASONequipmentall hasdifferentcaseofcommemial application，
where there is large difference in quantity and time of connnercial
application You couldrefer usercontents ol’manufacturel sfor COO1一
inertial applicatious ofeach company’s ASON eqNpment
4 Maturity analysis of ASON and MSTP products
It i s well knowl_that both AS0N aIld M STP are tlnde
development，which is mainly caused by having no final standard．All
nlanufucturers want to bring forward their standard to occupy the
market In fact．each nlanufacturer adopts his standald to indepen—
dently construct network and so has 110 problem oF having a unified
standard with other manufucturers
Although tmditional SDH smudard is untied and maRlre．it i not
deep enough to realize unification of management and control of two
arbitrai7 mauufucturers’equipment Forexample，Beijing Telecom is
维普资讯
TOPICSOFMAJORINTERE~ 固国固
using SDH equipment from Lucent．Marconi and Huawei Although
the equipment is developed and produced under one same SDH
standard．it still could not realize unification of netw ork nlanagement
andcontrol Tile rcas。1]is山 the st,'mdard could not specit~,'alldetails
Diffe~ent manufacturersjUSt realize inter—operability of service．but
not unification ofprotection romtiou control and network management．
Actually．Beijing Telecom’s SDH transmission equipn'tent from three
manufacturers are independently constructed and managed There is
1tlsl service switch in places
trol protocol In fact several standmdizatkm organizations all adopt
protocols and stmldards of some manufacturers，where eveO,manu—
facturer takes different proportion and i．1n—unified standard appears
because of unstopped dispute For example there are tWO branches
for route signaling standard
In fact，ASON equipment aCFOSS two manufacturers just realizes
inter-operabilityof serviceandmmlagementoftwonetwo~s viaE—NNI
protoc~，whichisdecidedbytheinternational standmvlizationOI'ga．1lizallon
While this protocol has not been formally released ai present which is
causedbydifleremopinions Thisis non—perl~ctplaceofASON．
Butfora carrier．onetIansmissionnetworkinonearea such asin
oneme~opolitanoroneprovince adoptsabovetwoASONequipment，
a unifiedE—NNIprotocoljs needed 0thenvi~ iflt selectedone kjnd
家用户目录。
4 关于 As0N与 MSTP产品成熟·I生的
分 析
众所周知，ASON MS—FP技术都处在
发展之中，主要表现在标准没有完全定下
来，其主要原因是各个厂商都想推出自己的
标准，得以抢占先机。事实上，每个厂商采
用自己的标准独立组网，不存在与其它厂商
统一标准的问题。
传统的SDH标准虽然己统 、完备，但
其标准的深八程度远不能实 任意两个厂商
设备管理与控制的统～ 如目前北京t吏用的
朗讯、马可尼和华为3公司的SDbt传输设备，
虽然这些设备都是在～个 SDH标准下开发、
制造的，但还是无法实现网络管理与控制的
统一 原因是标准无法规定所有细节。不同
厂商设备只是实现了业务的互通，无法实现
保护倒换控制 网络管理的统 实际上，北
京三个厂商的sD__传辖设备是独立组网管
理的，只是个别地方存在业务转接。
与传统的SDH设备标准一样，国际各个
标准化组织也无法实现ASCN控制等协议的
统一 事实上，几个标准组织部是分别采用
了一些厂商推出的协议标准 只是各个厂商
占的比例不同，且在一些方面因为争论不休
出现了分支，出现了标准的不统一现象，如
路由信令部分标准就出现了丽个分支。
事实上，跨两个厂商的ASON设备，只能
通过E—NN J(外辩网络节点互连)协议来实现
两个网络的业务与管理互通， 际标准组织就
是这}芏定的。而这一协议目前还没有正式颁
布，也是因为各方各持己见，难以达成一致。这
也正是ASON“不理想”的地方。但对一个运
营商采讲，在一个区域内，如一个城市或一个
省内的一个传送网络中采用两种以上的ASQN
设备，需要统一的E NNI协议。采用一个厂商
的ASON设备，就不会因为没有E-NNI标准
而担忧。当然如果选用了 稗 s,SON设备组网
后，再用另一种ASON设备建一个新网时，将
维普资讯
圈固图匝 面 ．3l龆
无法与原来的 络统一，只能像北京通信现在
一 佯，建设若干个传输网。
对于MSTP设备同咩也是如此，很少有通
信运营商在 个区域 (一个网络中)采用两种
以上的MSTP设备 如果说一个城域网中使用
了两个厂商的传输设备，那／厶大多数运营商都
是建立了两个以上的传送网绍，而在一个网络
中采用的都是一个厂商的设备，很少有像
AT&T公司将 CIENA公司的 ASON设备与
Cisco公司的MSTP设备建立在一个网络中
(据我了解这是目前唯一成功的范例)。
另外需要说明的司题是，现在北京通信
是采用 ASO 产品还是采用传统的多端口
10 Gbh／s设备组建传送网的骨干、汇聚层，
我个人认为应该采用ASQN设备 这是因为
多光口设备在传输技术发展的历史进程中属
于 “昙花一现” 如朗讯公司已放弃了BWM
这一多光口1 0 Gbit／s设备的生产，而转为
生产 Lambda-UNITE (ASON)设备；西
门子公司也收购了SYCAMORE公司，转产
ASON设备；北电公司也生产HDX产品。
因此，北京通信在建网中，应该选择ASON
产品，而不应再j丘用技术过时 多端口设备 另
外，ASON与IVSTP并不矛盾，实际上，ASOIX：
点设备中同咩能采用多业务端口。
从上面 沦可以看到，北京通信采用
ASON十MSTP组建 个新的综合传输网是
最优的方案 只要我们从技术与经济上并重考
虑，选择一个可靠的设备制造商，就能建成一
个高品质、方便维护、安全可靠、统 灵活、多
蝉的综合传送 务网络，并且它将对北京通信
业务的开拓与发展起到重要作用。互
作者简介：
任光伟， g 8 6年毕业于北方交通 大
学，高级工程师．主要从事传输网络建设
和维护工作。．观任北京市通信公司网络局
总工程师
收稿 日期 ：2 0 0 5—0 5 1 2
of ASON equipment to construct netwol’k and then chooses；mother
kind ofASON equipment to build a new network．it will not be able
to realize unification with existing network It needs cons[I’ucting sov—
era]transmission networks like Beijing Telecmn
it also applies to MSTP equipment．few telecom carriers adopt
more than tWO M STP equipment in O11e afea Ol one netwnrk If it
uses transnfission eqnipment fl'om two manulhctnrelN in one metro
politan area netw ork，more than two transmission networks are built
by most cmTiers W hile all equipment used in a network often comes
n 【1]one inanufan[nreE There is few like ＆T who combines ASON
equipment of ClENA AND MSTP equipment of Cisco into one
network．which is．as 1 know，the only successful case at present
It needs to mention that I pmfer BCC to adopt ASON equipment
not traditional multi—port 10 GNUs equipment 10 construct backbone
and convergence layers oftrtmsmission network That is becanse multi—
optical port equipment is a flash in the pan in the development history
．
oft~ansmissionteclmology．F{n‘example．Lucentbas quitted prodnc—
tion of BWM and turned to productioo of Lambda—UNITE(ASON)
equipment；Siemens also purchases SYCAMORE to produce ASON
equipment：Nortel also prod uces HDX ploducts．
St>BCC should 1101 consider()Lit—-of-date multi—-port equipment
but ASON products when it consn-ucts network In addiLion．there is
no contravention between ASON and MSTR Actually．ASON node
equipment also adopts multi—service pOll
According to the discussion above，it is tile optimization scllenlo
for BCC to select ASON+MSTP to construct a new integrated trails—
mission network As long as we take both technology and econonty
into consider mid select a reliable equipment nlallufactnre1．we could
build a high quality convenient to maintain．secule￡md reliable uni—
fled and flexible and diversified integlalien transmission service
network，and make it play a itllp~lrtant role in the exploit and develop—
menl‘)F BCC Sel vice
Biography：
REN Guang—wet：I Ie graduated from Norther’i1 J[ao
Tong Uttiversity n1 1988，he is currently CIfief Engineer of
Beijbig Commtutication corpol atioo。s Network Bureau．
维普资讯
