在10GBase-ER标准中，使用单模光纤最大传输距离是（ ）。
- A.300米
- B.5公里
- C.10公里
- D.40公里
正确答案及解析
正确答案
解析
10GBase-ER中的“ER”是“Extended Range”（超长距离）的缩写，表示连接距离可以非常长。该规范支持编码方式为64B/66B的超长波（1550nm）单模光纤（SMF），有效传输距离为2米到40公里。
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