FTTB，即Fiber to The Building（光纤到楼)，它是利用（)技术，光纤直接到小区里，再通过双绞线（超五类双绞线或4对非屏蔽双绞线)到各个用户。

A . 0 ps/nm B . 340 ps/nm C . 200 ps/nm D . 3400 ps/nm E . More information is needed.

A .  0 ps/nm B .  340 ps/nm C .  200 ps/nm D .  3400 ps/nm E .  More information is needed.

A . it is carried on only 1 vhba per ucs system B . it has a qos policy in order to maintain traffic priority C . there is a supporting vsan to carry the fcoe traffic D . there is a dedicated VLAN to carry the FCoEtraffic

A . 1Gbps B . 2Gbps C . 4Gbps D . 8G

A . 接入技术。 B . 交换网络 C . 接入网络 D . 数据网络 E . 有线电视网络

A . RMF Magic B . Capacity Magic C . Disk Magic D . PerfMo

A . Nylon B . Dacron C . Manila D . Sisal

A . use lye or other mild detergent B . wash it with fresh water，dry and store it C . wash it with salt water D . use cleaning fluid on nylon，dacron and other synthetic line

A .  PIN photodiodes B .  zero-chirped lasers C .  Erbium-doped fiber amplifiers D .  dispersion compensating fiber E .  dispersion compensating Bragg grating

A . Using a small scope ratio B . Replacing that portion with a short length of chain C . Using a hockle to keep that portion of the anchor line off the bottom D . Using a synthetic line

A .  Adjust the default hello timers to three seconds for aggressive mode B .  Enable it in global mode and on every interface you need to support C .  Enable it in global mode to support every individual fiber-optic interface D .  Enable it to create channels containing up to eight parallel links between switche

A . Belaying spike B . Fid C . Heaver D . Pricker

A .  They are both regions of lowest loss. B .  They are both regions of low reflections. C .  They are both regions of low index of refraction. D .  They are both regions of low chromatic dispersion. E .  They are both regions of low Polarization Mode Dispersion （PMD）.

A . 1Gbps+ B . 2Gbps+ C . 4Gbps+ D . 8Gbps+

A . dried，and stowed in a place with adequate ventilation B . stowed in a hot，moist compartment C . stowed on deck at all times D . stowed in any compartment

A . PIN photodiodes B . zero-chirped lasers C . Erbium-doped fiber amplifiers D . dispersion compensating fiber E . dispersion compensating Bragg grating

A . A、光纤到楼 B . B、光纤到办公室 C . C、光纤到户 D . D、光纤到小区

A . root guard B . loop guard C . BPDU guard D . UDLD E . BPDU skew detectio

A.Never look straight at output optical interface or tail fiber end surface that connects with it. B. First you must disable laser output to avoid too strong output power burning down tail fiber end face. C. Use an optical power meter to measure input interface power to avoid receiver burning down due to overload. D. If there are no attenuators, loosen the receiver and tighten the transmitter to prevent optical input from overloading. 此题为多项选择题。

Given the formula: (Fiber Attenuation * Km) + (Splice Attenuation * of Splices) + (Connector Attenuation * of Connectors) + (Optical Fiber or OADM) + Buffer(Fiber aging)) With regard to SONET/SDH optical calculations, what will the given formula provide？（） A. fiber loss B. OSNR level C. post amplification D. index of reflection E. index of refraction F. power post amplification budget

是 否

A．SC-LC B．LC-SC C．LC-LC D．SC-SC

A．Long transmission distance, high cost and thin core B．Long transmission distance, high cost and thick core C．Short transmission distance, low cost and thick core D．Short transmission distance, low cost and thin core