题目内容
（请给出正确答案）
[单选题]
ZXWM M900提供了多种有效的保护方式：基于光网络层的光通道1+1保护、光通道1:N保护、光复用段1+1保护。保护倒换时间为()
A.小于40ms
B.小于30ms
C.小于20ms
D.小于50ms
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.小于40ms
B.小于30ms
C.小于20ms
D.小于50ms
如果结果不匹配，请 联系老师 获取答案
更多“ZXWM M900提供了多种有效的保护方式：基于光网络层的光…”相关的问题
A.ZXWM M900 supports the back-to-back installatio
B.ZXWM M900 supports the by-the-wall installatio
C.ZXWM M900 supports the wires connected on the top of the cabinet.
D.ZXWM M900 supports the wires connected to the back of the equipment.
A.NCPF、APSF
B.APSF、OHPF
C.NCPF、OHPF
D.NCPF、OSCF
A. Both the power line and the grounding line use the 10mm2 multi-strand lead wire. You can also use the 16mm2 multi-strand lead wire.
B.The external power lines include two blue wire, two black lines, and one yellow and green line, which represent -48V, -48V GND, and PGND.
C.Wires of all kinds of colors can be used in a mixed way.
D.The ZXWM M900/ZXMP M800/ZXWM-32(V1.1) equipment use the -48 V DC power supply
