CN101095361B - 纤维光学模件以及包括后连接件的系统 - Google Patents
纤维光学模件以及包括后连接件的系统 Download PDFInfo
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Abstract
一种电信组件,包括壳体和安装在壳体内的多个模件。所述模件包括安装至少一个纤维光学连接件的后面。至少一个纤维光学适配器定位在壳体内部。穿过壳体的前开口将模件插入在安装位置可以将插入壳体的适配器内并与其配合的模件连接件定位。壳体内部的适配器安装在可拆除固定件上。提供了一种将电信模件安装在底板内的方法。
Description
技术领域
本发明总体涉及纤维光学电信设备。更具体地,本发明涉及纤维光学模件以及用于固定该纤维光学模件的底板。
背景技术
在纤维光学电信系统中,常见的是通过对由单股电缆传输的信号进行光学分割或者通过使多股电缆的各个纤维分开而将传输电缆的光纤分成多股。此外,当安装这种系统时,已知的是向安装装置提供额外的容量以支承以后纤维的增长和应用。经常在这些安装装置中,采用包括分离器或散开器的模件提供传输纤维与用户纤维之间的连接。为了降低初始安装的成本和复杂性并为以后的扩容提供机会,可以在这种安装装置中采用能够安装多个模件的模件安装底板。
尽管底板可以容纳几个模件,但初始安装装置仅可以包括安装在底板上的较少的模件,或者仅足够满足当前需要。这些底板可以被构造成具有通向一个或多个侧面的有限入口,或者可以安装在狭窄的位置。另外,这些底板中的一些可以被预先构造成具有最大的传输电缆容量以容纳并连接将来要安装的模件。由于要求在底板内具有部件的入口以在新模件的安装过程中进行清洁,底板的一些设置或特征要求使使用者可以触及并清洁这些预先连接和预先安装的传输电缆的连接件。
还要求底板被构造成确保模件准确并与其它部件对准地安装在底板内以与预先连接和预先安装的传输电缆配对。
发明内容
本发明涉及一种电信组件,其包括壳体和安装在壳体内的多个模件。所述模件包括安装至少一个纤维光学连接件的后面。至少一个纤维光学适配器定位在壳体内部。穿过壳体的前开口将模件插入在安装位置可以将用于插入壳体的适配器内并与其匹配的模件连接件定位。壳体内部的适配器安装在可拆除的适配器固定件上。本发明还涉及一种将电信模件安装在底板内的方法。
附图说明
结合在说明书中并构成其一部分的附图示出了本发明的几个方面,并与详细的描述一起用于说明本发明的原理。对附图的简要说明如下:
图1是具有穿过前开口安装的多个纤维光学模件的电信组件的正面透视图。
图2是从相对一侧观察得到的图1所示电信组件的正面透视图。
图3是图1所示的电信组件的正视图。
图4是图1所示的电信组件的俯视图。
图5是图1所示的电信组件的后视图。
图6是图1所示的电信组件的侧视图。
图7是图1所示的电信组件的正面透视图,一个模件从组件中突出并且从底板的上和下表面上拆除安装凸缘。
图8是图7所示的电信组件的后部透视图。
图9是图7所示的电信组件的侧视图,纤维光学适配器固定件从组件中突出。
图10是通过安装在组件内的一个模件的中心截取的图1所示的电信组件的侧面横截面图。
图11是图1所示的电信组件的正视图,一个模件被拆除以示出安装在组件内部的适配器固定件。
图12是从组件上拆除的图11所示的适配器固定件的正面透视图。
图13是图12所示的适配器固定件的正视图。
图14是图12所示的适配器固定件的后视图。
图15是图12所示的适配器固定件的侧视图。
图16是图12所示的适配器固定件的俯视图。
具体实施方式
现在将对在附图中示出的本发明的示例性方面做出详细参照。无论如何,相同的附图标记在全部图中都将被用于指代相同或相似的部件。
图1表示电信组件10,其具有用于安装多个模件14的安装位置12。组件10包括底板或壳体16,其具有第一主侧面18、第二主侧面20以及在第一和第二主侧面之间延伸的一对相反的横侧面22。安装凸缘24可以安装在大体上彼此相对延伸的每个主侧面上。辅助或备选的安装凸缘26也可以安装在一个主侧面上以为将壳体16安装在特定尺寸或形状的设备机架、机柜或其它类型的安装装置上提供选择。
壳体16限定了前开口28,模件14穿过该前开口28插入到壳体16的内部30(在下文图7中示出)。可以在横侧面22上限定开口32以使人可以进入内部30。开口32可以包括环绕一周的保护垫34以防对穿过开口32之一进入或离开内部30的任何手产生擦伤和其它伤害。在图1中穿过开口32可以看到安装在前开口28内的模件14之一的壳体40。凸缘24和26可以包括多个紧固件开口36,用于将壳体16安装在电信安装装置需要的位置。
现在参照图2,每个模件14包括靠近第二主侧面20的可释放的制动件42。下文图10中可以看到并得到描述的是,制动件42接合壳体16的一部分以将模件14固定在前开口28内并且还可以被偏转以允许从壳体16中取出模件14。每个模件14还可以包括从前面46延伸的一个或多个电缆出口44。电缆出口44使在模件14内的电信电缆被引导到模件14的外部,这将在下文参照图10进行描述。如图2所示,模件14的前面46相对于前开口28成角度,该角度有助于将退出模件14的电缆向电信安装装置中的所需位置引导。将会认识到在本发明的范围内前面46也可以被制造成大体上平行于在前开口28处的横侧面22的前边缘38。
现在参照图3,模件14包括分别容纳在相应尺寸的槽52和54内的不等长凸缘48和50。凸缘48和槽52在尺寸上比凸缘50和槽54更小。槽52的尺寸被设计成使得当凸缘48可以容纳在槽52内时,不能装配更大的凸缘50。这样确保了模件14以特定所需的定向定位在前开口28内。在共同拥有的美国专利No.5,365,465中描述了类似的凸缘,该专利在此引入作为参考。通过指旋螺钉58可拆除地固定在前开口28内的适配器固定件56与制动件42相对并在每个安装位置12处安装在壳体16上。下文将参照图9-16更详细地描述适配器固定件56。
现在参照图4和5,壳体16还包括与前开口28相对的背面60,其基本上封闭了壳体16的后部。可以穿过背面60设置开口以使电缆或空气通过,但是将会认识到用于进入壳体16的内部30的使用者的进入口将会穿过前开口28形成。如图6所示,在模件14的一端可以包括唇状或指状夹紧件62以有助于从壳体16上拆除模件14。指状夹紧件62优选定位在模件14上与制动件42相对,使得使用者可以利用手指或手施加相反的力以可靠夹紧模件和将其从壳体16拆除。
现在参照图7,模件14的制动件42包括接合安装位置12的边缘64以将模件14固定在前开口28内的适当位置的凹区66。凹区66形成在制动件42远端附近并且柔性部分68从凹区66延伸到与模件14的第一侧面70相连的连接点。柔性部分68可以弹性变形并允许使用者偏转制动件42以使凹区66与边缘64脱离以及从壳体16上拆除模件14,或者在模件14插入前开口28内并接合边缘64时使制动件42偏转。模件14包括第二相对侧面72和背面78。中间后面76通过插入式侧面部分74形成在第二侧面72上。一对纤维光学连接件80定位在后面76上以与安装在壳体16的内部30内的适配器固定件56上的纤维光学适配器配合。
模件壳体40还包括在第一侧面70、第二侧面72、背面78和前面46之间延伸的第一横面82。第二横面84封闭模件壳体40在前面46与背面78之间的相对侧面但延伸超出侧面70和72以形成凸缘48和50(凸缘50在图7中不可见)。在图8中,可以看到凸缘50作为第二横面84超出模件14的侧面70的延伸部。模件壳体40可以包括在侧面70和72与背面78之间的弯曲过渡部86。过渡部86的形状可以被构造成当电缆延伸到适配器88时向内部30内的电缆提供弯曲半径保护。备选地,根据将部件放置在模件壳体40内的需要并提高模件壳体40的制造效率,侧面70和72也可以直接终止在背面78处。
图9表示具有从内部30中分解出的适配器固定件54的组件10。固定件54包括延伸部86,其将一对适配器88固定并定位以接合模件14的连接件80。每个适配器88包括第一或后端90以及第二或前端92,并且第一和第二端各自适于容纳可以端接纤维光学电缆的纤维光学连接件。
图10表示具有从连接件80延伸到光学部件98并安装在模件壳体40的内部96内的第一电缆94的组件10的横截面。光学部件98可以是分离器或散开器或其它类型的光学有效构件。第一电缆94可以是具有多股光学纤维的多股纤维电缆并且光学部件98可以是将各股分成多个第二电缆100中的每个的散开器。第二电缆100从光学部件98延伸到电缆出口44。备选地,第一电缆94可以是其信号通过作为分离器的光学部件98得到分离的单个纤维并且传输来自第一电缆94的部分信号的多个第二电缆100可以延伸到电缆出口44。在共同拥有的美国专利申请No.10/658,802中公开了在电缆出口44处的光学纤维和加有护套的结构,该申请公开的内容在此引入作为参考。
外部电缆102可以延伸到适配器88的后端90并通过连接件104端接。连接件104可以容纳在后端90内以与模件14的连接件80光学相连。电缆102可以从壳体16的内部30延伸穿过壳体16的侧面18,20或22中的一个上的开口。
现在参照图11,组件10的一个模件已从安装位置12中拆除,而处于那一安装位置12的是备选适配器固定件154。固定件154包括在适配器88第二端92前面的护罩108。在一些安装装置中,在模件14放置在相关安装位置12内之前可以安装壳体16并引导电缆102与适配器88的第一端90相连。如果电缆102发光并传递光信号,则护罩108将防止偶然暴露这些信号,这些信号会破坏眼睛或其它感觉器官,或附近的通信设备。
在图12中,固定件154包括穿过延伸部86的开口124,穿过该开口安装适配器88。指旋螺钉56延伸穿过前凸缘114并且一对壁接合凸缘116从相邻前凸缘114处向后延伸。备选地,可以采用其它可释放结构例如搭扣配合装置、直角弯紧固件、膨胀插销或类似的结构代替在紧固件54或154上的指旋螺钉56。槽118定位在每个凸缘116的前端与前凸缘114之间。一对壁槽120向着凸缘116的后端。如图10所示,内壁110定位在内部30内,向内偏离第一主表面18。壁槽120沿着内壁110的两侧延伸。第一主表面18的内弯的前边缘112接合槽118。壳体16与固定件154之间的这些接合准确地将适配器定位成在内部30内偏离内壁110以接合模件14的后面76上的连接件80。中心元件122从壁凸缘116之间的前凸缘114延伸到延伸部86以将适配器88准确定位在内部30内的前开口28与背面60之间。
现在参照图13-16,固定件154的延伸部86包括多个紧固件开口124以将适配器88安装在延伸部86上。紧固件126可以延伸穿过适配器88的侧凸缘128,从而可以可靠地安装适配器88。适配器88被示出是SC型连接件,尽管如此在本发明公开范围内可以采用其它类型、型式和规格的适配器并改变连接件80和104以与这些备选的适配器相配。在所示的每个适配器88内可以具有对准装置例如对开套筒130,以将终端为套圈的光学纤维准确进行定位并通过连接件80和104进行固定。这种定位装置和终端套圈在本领域是众所周知的。
护罩108在从侧面观察(如在图15中)时是弯曲的,使得当模件14穿过前开口28插入到内部30内时护罩108将通过模件14偏转,从而连接件80可以与适配器88配合。护罩108优选由弹性可变形材料制成,其在模件14从安装位置12中被抽出时回到图15所示的位置。护罩108可以通过一对紧固件例如螺钉132与中心元件122相连。备选地,护罩108可以通过与固定件154一体形成或者通过点焊或其它紧固工艺与固定件154相连。当背面60封闭壳体16的后部使得没有任何进入口可接近安装在安装位置12的任何模件14后部时,则如图所示不需要提供第二护罩108以阻隔来自每个适配器88第一端90的光。然而,如果一些灵敏设备安装在模件14或壳体16内,则要求具有第二护罩108阻隔适配88的第一侧面90。
模件14在一个安装位置12插入到壳体16内可以包括首先松开指旋螺钉56并通过前开口28从内部30中取出固定件54或154。电缆102优选在内部30内包括足够的额外长度或松弛以使适配器88可以穿过开口28被拉动。一旦定位在内部30的外部,电缆102的连接件104就可以从适配器88的第一端90上拆下以使电缆102内光学纤维的抛光端面得到清洁。连接件104随后可以重新插入到第一端90内。固定件54或154可以重新插入到内部30内,使得固定件接合内壁110、向内弯曲的延伸部112以及重新固定的指旋螺钉56。模件14插入到前开口28内使模件14开始与壳体16和适配器88的配合。当模件14插入时,凸缘48和50分别接合槽52和54。当连接件80接近适配器88的第二端92时,连接件80和部分第二侧面72接合护罩108(如果存在)并使其偏转。模件14的进一步插入使连接件80进入适配器88并与其接触,连接件容纳在第二端92内。当模件14插入时制动件42向内偏转并随后回弹,使得凹区66接合边缘64。模件14此时安装在安装位置12处的前开口28和内部30内并处于适当位置以通过模件内部96内的第一电缆94、光学部件98和第二电缆100来处理和传输来自电缆102的信号。
以上说明、示例和数据提供了对本发明制造和使用的完整描述。由于在不脱离本发明精神和范围的前提下可以提出本发明的许多实施方式,因此本发明限制于下文附加的权利要求中。
Claims (35)
1.一种电信组件,包括:
底板和安装在底板内的模件;
所述底板包括:
可以通过前开口来触及的内部空间,所述底板包括与前开口相对的背面;
位于内部空间内的多个安装位置;
与安装在内部空间内的每个安装位置相对应的至少一个纤维光学适配器,所述纤维光学适配器各自包括指向前开口的前端和指向背面的后端,每一端被构造成容纳纤维光学连接件;以及
用于在每个安装位置固定所述至少一个纤维光学适配器的固定件,所述固定件可以通过底板的前开口从内部空间中拆除以允许触及安装在固定件上的纤维光学适配器的后端,所述固定件将纤维光学适配器定位在前开口后面的内部空间内;以及
所述模件安装在一个安装位置处并包括具有后面的壳体,至少一个纤维光学连接件安装在所述壳体的所述后面上以接合底板内的所述至少一个纤维光学适配器,所述模件与所述可拆卸的固定件分开地安装在底板内,从而当所述模件安装在所述底板中时所述模件的所述至少一个纤维光学连接件与安装到底板上的所述至少一个纤维光学适配器相配合。
2.如权利要求1所述的电信组件,其特征在于,所述模件还包括:
在模件壳体内部空间内的至少一个光学部件;
具有电缆出口的前面;以及
在模件壳体内部空间内从后面的纤维光学连接件延伸到所述光学部件的第一光学纤维电缆,以及从光学部件延伸到前面的电缆出口的至少一个第二光学纤维电缆。
3.如权利要求2所述的电信组件,其特征在于,在模件壳体内部空间内的第一光学纤维电缆是一个多股纤维电缆,包括多个光学纤维股,所述光学部件是散开器,其构造成将所述多个光学纤维股的各单独股分散成所述至少一个第二光学纤维电缆中的每一个,其中所述至少一个第二光学纤维电缆从光学部件延伸到前面上的电缆出口。
4.如权利要求2所述的电信组件,其特征在于,所述光学部件是光学分离器,所述第一光学纤维电缆包括单股纤维,并且多个第二光学纤维电缆从光学部件延伸到前面上的电缆出口。
5.如权利要求2所述的电信组件,其特征在于,所述模件包括一对在后面上的纤维光学连接件,所述固定件固定两个纤维光学适配器,所述纤维光学适配器各自容纳一个纤维光学连接件,所述模件包括一对光学部件。
6.如权利要求2所述的电信组件,其特征在于,所述模件包括一对在前面上的电缆出口。
7.如权利要求2所述的电信组件,其特征在于,所述电缆出口包括钟形部分,该钟形部分为延伸穿过电缆出口的所述至少一个第二光学纤维电缆提供弯曲半径保护。
8.如权利要求2所述的电信组件,其特征在于,所述模件的后面从模件壳体的最后延伸部朝前定位。
9.如权利要求1所述的电信组件,其特征在于,所述模件的后面从模件壳体的最后延伸部朝前定位。
10.如权利要求1所述的电信组件,其特征在于,所述固定件将所述至少一个适配器从底板背面向前定位。
11.如权利要求1所述的电信组件,其特征在于,还包括多个模件,每个模件安装在一个安装位置。
12.如权利要求11所述的电信组件,其特征在于,每个模件包括一对相对的安装凸缘并且每个安装位置包括一对相对的槽以容纳模件的凸缘。
13.如权利要求12所述的电信组件,其特征在于,所述凸缘中的一个大于另一个并且槽中仅有一个的尺寸被设计成容纳两个凸缘中更大的凸缘。
14.如权利要求1所述的电信组件,其特征在于,所述固定件靠近底板的一个侧面定位并包括沿相邻侧面直到前开口的向前延伸部,所述向前延伸部通过可拆除的紧固件可释放地固定在底板上。
15.如权利要求14所述的电信组件,其特征在于,可拆除的紧固件是通过固定件的向前延伸部锁扣固定并可拆除地容纳在底板的紧固件开口内的指旋螺钉。
16.如权利要求1所述的电信组件,其特征在于,所述底板的安装位置之一还包括延伸到至少一个纤维光学适配器并容纳在该至少一个纤维光学适配器后部中的纤维光学电缆,通过底板的前开口拆除固定件使得可以触及到容纳在纤维光学适配器后部的纤维光学电缆。
17.如权利要求16所述的电信组件,其特征在于,可以通过经底板的前开口拆除固定件来触及延伸到纤维光学适配器后部的纤维光学电缆,纤维光学电缆可以从纤维光学适配器的后部被拆除并得到清洁,纤维光学电缆可以在纤维光学适配器内得到更换并且固定件可以重新定位在底板内。
18.一种将模件安装在底板内的方法,包括:
提供包括前开口和模件安装位置的底板、定位在底板内部的模件安装位置并且可以通过前开口触及到的固定件,所述固定件将纤维光学适配器与容纳在纤维光学适配器后部的纤维光学电缆的纤维光学连接件固定在一起,并且所述方法还包括提供适于安装在模件安装位置的模件,所述模件包括具有纤维光学连接件的后面,其中所述模件被配置成与所述固定件分开地安装到所述底板上;
通过前开口从底板内部拆除固定件和纤维光学适配器;
从纤维光学适配器后部拆除纤维光学电缆的纤维光学连接件并检查纤维光学电缆内的光学纤维的端面;
更换纤维光学适配器后部内具有纤维光学电缆的纤维光学连接件;
更换底板内模件安装位置处的固定件;
穿过前开口将模件插入到底板内的模件安装位置处并使纤维光学适配器的前面与模件后面上的纤维光学连接件接合。
19.如权利要求18所述的方法,其特征在于,还包括提供具有一对相对槽的模件安装位置以及具有一对凸缘的模件,凸缘中的一个大于另一个并且仅有一个槽的尺寸被设计成容纳更大的凸缘,所述方法还包括在穿过底板的前开口插入模件之前使模件更大的凸缘与模件安装位置上尺寸被设计成容纳更大凸缘的槽对准。
20.一种电信模件,包括:
壳体,其限定了内部空间并包括第一侧面和相对的第二侧面,所述壳体还包括前面、最后面和位于前面和最后面之间的中间后面,所述壳体还包括第一横面和相对的第二横面,所述第一和第二横面在前面和最后面之间并在第一侧面和第二侧面之间延伸;
延伸超出壳体的第一侧面和第二侧面中的每个的安装凸缘;
安装在中间后面上并定位成通过壳体的向后移动而插入到匹配的适配器内的至少一个纤维光学连接件,所述至少一个纤维光学连接件具有布置在壳体的前面与最后面之间的末端;以及
定位在壳体的前面上的电缆出口;
在壳体内部空间内从中间后面上的所述至少一个纤维光学连接件延伸到安装在壳体内部空间内的光学部件的第一纤维光学电缆;
在壳体内从光学部件延伸到前面上的电缆出口的第二纤维光学电缆。
21.如权利要求20所述的电信模件,其特征在于,所述电缆出口包括超出前面的钟形外延伸部。
22.如权利要求20所述的电信模件,其特征在于,所述壳体包括靠近前面延伸的柔性锁突。
23.如权利要求20所述的电信模件,其特征在于,所述壳体的中间后面定位成靠近由壳体限定的一个凹部。
24.如权利要求20所述的电信模件,其特征在于,一个凸缘延伸得基本上比另一凸缘更远离相应侧面。
25.一种电信模件,包括:
壳体,其限定了内部空间并包括第一侧面和相对的第二侧面,所述壳体还包括前面、最后面以及位于前面和最后面之间的中间后面,所述壳体还包括第一横面和相对的第二横面,所述第一横面和第二横面在前面和最后面之间并在第一侧面和第二侧面之间延伸;
中间后面限定了至少一个纤维光学连接件固定位置,用于固定纤维光学连接件,该纤维光学连接件具有与在前面和最后面之间延伸的模件轴线相平行地延伸的纵向连接件轴线,其中纤维光学连接件的末端布置在由壳体限定的内部空间之外;
中间后面定位在前面与最后面之间的一个位置;
前面包括与由壳体限定的内部空间相通的电缆出口位置。
26.如权利要求25所述的电信模件,其特征在于,所述电缆出口包括超出前面的钟形外延伸部。
27.如权利要求25所述的电信模件,其特征在于,所述壳体包括靠近前面延伸的柔性锁突。
28.如权利要求25所述的电信模件,其特征在于,所述壳体的中间后面被定位成靠近由壳体限定的一个凹部。
29.一种适配器模件,包括
固定件,该固定件限定:
前凸缘,其用于固定在第一纵向上穿过前凸缘延伸的紧固件;
在平行于第一纵向的方向上从前凸缘延伸的壁配合凸缘;以及
从壁配合凸缘延伸的延伸部,所述延伸部限定了适配器位置;以及
定位在固定件的延伸部的适配器位置上的多个适配器匹配部件,每个适配器匹配部件被构造成使两个连接件配合以在连接件之间进行纤维光学信号传输,其中每个适配器匹配部件在平行于第一纵向的方向上与所述两个连接件对准,其中所述适配器模件还包括被安装到所述壁配合凸缘上覆盖每个适配器匹配部件的可移动保护罩,以防止意外地暴露于由安装在适配器中的不匹配连接件所传送的光线信号中。
30.如权利要求29所述的适配器模件,其特征在于,还包括在前凸缘中的紧固件。
31.如权利要求29所述的适配器模件,其特征在于,所述多个适配器匹配部件对准在横断第一纵向的方向上。
32.一种电信底板,包括:
第一主侧面、第二主侧面、以及在所述主侧面之间延伸的一对相对的横侧面,从而限定了具有前开口和与前开口相对的背面的内部空间;
限定用于穿过前开口插入的电信模件的多个安装位置,每个模件大体上平行于一个横侧面定向;
每个安装位置包括适配器固定件,每个适配器固定件可拆除地安装在底板的内部空间内并包括至少一个纤维光学适配器,每个纤维光学适配器包括前端和后端,每一端被构造成容纳一个纤维光学连接件;
每个适配器固定件对所述至少一个纤维光学适配器进行定向,使前端被定位成容纳穿过前开口插向背面并大体上平行于侧面的一个纤维光学连接件;
每个适配器固定件定位成将所述至少一个纤维光学适配器固定在底板的内部空间内前开口后面以及背面之前的位置,使得具有一个纤维光学连接件的纤维光学电缆可以被引导并插入到所述至少一个纤维光学适配器的后端;
每个适配器固定件可以通过前开口从底板的内部空间被拆除,使得所述至少一个纤维光学适配器的后端可以从内部之外触及到,每个安装位置的尺寸被做成可容纳电信模件,该电信模件具有从该模件突出的纤维光学连接件,用于与每个适配器固定件的所述至少一个纤维光学适配器的前端相匹配,其中所述底板被配置成与可拆卸地安装的适配器固定件分开地容纳电信模件,从而当所述电信模件安装在底板中时所述电信模件可以与已安装的适配器固定件相配合。
33.如权利要求32所述的电信底板,其特征在于,还包括将每个适配器固定件安装在底板上的可拆除紧固件。
34.如权利要求32所述的电信底板,其特征在于,还包括用于将每个适配器固定件滑入和滑出底板的纵向安装件。
35.如权利要求33所述的电信底板,其特征在于,还包括用于将每个适配器固定件滑入和滑出底板的纵向安装件。
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US10/980,978 | 2004-11-03 | ||
PCT/US2005/039827 WO2006052675A2 (en) | 2004-11-03 | 2005-11-02 | Fiber optic module and system including rear connectors |
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CN101095361B true CN101095361B (zh) | 2012-05-23 |
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