Figure18.4三种地址格式 DLCI C/R EA=0 DLCI FECN BECN DE EA=1 a.Two-byte address(10-bit DLCI) DLCI C/R EA=0 DLCI C/R EA=0 DLCI FECN BECN DE EA=0 DLCI FECN BECN DE EA=0 DLCI EA=0 DLCI 0 EA=1 DLCI 0 EA=1 b.Three-byte address(16-bit DLCI) c.Four-byte address(23-bit DLCI) 18.9 18.9 Figure 18.4 三种地址格式