Telecommunications. Of a telephone exchange or system: operated by automatic switches and relays, without human involvement (now historical)…
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| 单词 | θ198016 |
| 释义 | society > communication > telecommunication > telegraphy or telephony > telephony > telephone equipment > [adjective] > types of exchange (5) automatic1879 Telecommunications. Of a telephone exchange or system: operated by automatic switches and relays, without human involvement (now historical)… private1891 Telephony and Telegraphy. Of a telephone exchange: serving private lines. Chiefly in private branch exchange n. at compounds 2. Subcategories:— types of exchange equipment (3) |
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