If you are creating a redundant solution, it's important to split the primary and secondary switch between the upper half and lower half of the chassis.
如果要创建冗余的解决方案，就一定要把主交换机和辅交换机分别放在机架的上半部分和下半部分。
They then clad its upper portion in sheets of ribbed grey steel, and its lower half in cedar weatherboards.
他们将上层部分包裹灰色钢肋，一层则覆盖雪松护墙板。
Effectively, one tube amplifies the "upper half" and the other tube amplifies the "lower half".
实际上，单管放大的“上半部”及其他管扩大了“降低一半。”
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