- In SNA, a field in each transmission header (TH) that indicates the format of the TH; that is, the presence or absence of certain fields. Transmission header formats differ in accordance with the types of nodes between which they pass.; 在系統(tǒng)網(wǎng)絡(luò)體系結(jié)構(gòu)(SNA)中,每個(gè)傳輸頭(TH)中的一種表示傳輸頭格式的字段, 即某些字段出現(xiàn)與否。傳輸頭格式按其經(jīng)過的網(wǎng)點(diǎn)類型不同而異。
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