| 单词 | rj-21 |
| 释义 | RJ-21RJ-21(Registered Jack-21) A communications and networking interface that uses a cable of twisted wire pairs. One end of the cable has a 50-pin Telco connector, and the wires branch out to 25 RJ-11 plugs or 12 RJ-45 plugs at the other end. See 50-pin Telco connector, RJ-45 and RJ-11. |
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