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2M是相对于64K等速率角度的描述。
标准中相关描述为:
Amendments of clauses 4, 9, 10, 11 with the inclusion of output return loss requirements for the 64 kbit/s (codirectional), 2048, 8448, 34 368 kbit/s interfaces.
E1是相对于E0等名称角度的描述,也直接可以对应到速率。
标准中相关描述为:
标准中相关描述为:
Amendments of clauses 4, 9, 10, 11 with the inclusion of output return loss requirements for the 64 kbit/s (codirectional), 2048, 8448, 34 368 kbit/s interfaces.
E1是相对于E0等名称角度的描述,也直接可以对应到速率。
标准中相关描述为:
– Insertion of names of hierarchical interfaces (E0, E11, E21 etc.) into the headings of the corresponding clauses. |
回答时间:2011-10-13 08:36
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