1#楼2#楼2.4.2综合布线常用符号英文缩写英文名称中文名称或解释ACR Attenuation to crosstalk ratio衰减串音比BD Building distributor建筑物配线设备CD Campus Distributor建筑群配线设备CPConsolidation point集合点dBdB电信传输单元：分贝d.c.Direct current直流EIA Electronic Industries Association美国电子工业协会ELFEXT Equal level far end crosstalk attenuation(10ss)等电平远端串音衰减FD Floor distributor楼层配线设备FEXT Far end crosstalk attenuation(10ss)远端串音衰减(损耗)IEC International Electrotechnical Commission国际电工技术委员会IEEEThe Institute of Electrical and Electronics Engineers美国电气及电子工程师学会IL Insertion 10SS插入损耗IP Internet Protocol因特网协议ISDN Integrated services digital network综合业务数字网IS0International Organization for Standardization国际标准化组织LCLLongitudinal to differential conversion lOSS纵向对差分转换损耗0FOptical fibre光纤PSNEXTPower sum NEXT attenuation(10ss)近端串音功率和PSACRPower sum ACRACR功率和PS ELFEXTPower sum ELFEXT attenuation(10ss)ELFEXT衰减功率和RLReturn 1oss回波损耗SCSubscriber connector(optical fibre connector)用户连接器(光纤连接器)SFFSmall form factor connector小型连接器TCLTransverse conversion lOSS横向转换损耗TETerminal equipment终端设备TIATelecommunications Industry Association美国电信工业协会ULUnderwriters Laboratories美国保险商实验所安全标准Vr.m.sVroot.mean.square电压有效值 PVC线槽通常用于室内明装布线，常用规格槽管布放电缆数量可以参照下表： 线槽容纳线缆数量 线槽规格3类4对5类4对3类25对3类50对3类100对5类25对25*2587100025*501715310275*252724531350*503632742550*10074661610512100*1001501343322112575*15016915138251328100*20030126968452352150*15033930377512758#楼1层2#6芯光缆来自1楼主机房蓝橙绿棕灰白数据信息点4-14-24-34-44-54-64-74-84-94-104-114-124-134-144-154-164-174-184-194-204-214-224-234-244-254-264-274-284-294-304-314-324-334-344-354-364-374-384-394-404-414-424-434-444-454-464-474-484-494-504-514-524-534-544-554-564-574-585-15-25-35-45-55-65-75-85-95-105-115-125-135-145-155-165-175-185-195-205-215-225-235-245-255-265-275-285-295-305-315-325-335-345-355-365-375-385-395-405-415-425-435-445-455-465-475-485-495-505-515-525-535-545-555-565-575-586-16-26-36-46-56-66-76-86-96-106-116-126-136-146-156-166-176-186-196-206-216-226-236-246-256-266-276-286-296-306-316-326-336-346-356-366-376-386-396-406-416-426-436-446-456-466-476-486-496-506-516-526-536-546-556-566-576-58语音信息点4-14-24-34-44-54-64-74-84-94-104-114-124-134-144-154-164-174-184-194-204-214-224-234-244-254-264-274-284-294-304-314-324-334-344-354-364-374-384-394-404-414-424-434-444-454-464-474-484-494-504-514-524-534-544-554-564-574-585-15-25-35-45-55-65-75-85-95-105-115-125-135-145-155-165-175-185-195-205-215-225-235-245-255-265-275-285-295-305-315-325-335-345-355-365-375-385-395-405-415-425-435-445-455-465-475-485-495-505-515-525-535-545-555-565-575-586-16-26-36-46-56-66-76-86-96-106-116-126-136-146-156-166-176-186-196-206-216-226-236-246-256-266-276-286-296-306-316-326-336-346-356-366-376-386-396-