ocr: MAC header AC FC DA SA AC: Frame Access check control fieldDA: fieldF( ISA<bit47>=1 Destination addressSA: Source address Routing informationfield (RC) 2(n+1) bytes (0958) RC SN1 SN2 SNn 2 4 2 2 bytes SN: Segment (ring) numb n: Number of source bridge Routing B L D LF r controlfield 3 5 1 4 3 bits B:E Broadcast bits L: Length bits (max == 2+a) D:D Direction LF: Largest frame rreserved Figure 1 Routing Information and Routing Control Fields
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