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| jerarquía digital síncrona | |||
| Jerarquía digital sincrónica | |||
| English thesaurus | |||
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| SDH | |||
| SDH (FDDI, ATM, SDH) | |||
| SDH (ITU-T); SDH (SONET) | |||
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| SDH | |||
| synchronous digital hierarchy: 3 phrases in 1 subject |
| Communications | 3 |
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