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BSD 4.3reno

.PS 4.375i
lineht	=	3*lineht/2
## OSI Transport Services on top of the TCP
B1:	box "TS-user"
	line down from B1.s
B3:	box "TS-provider" "(client)"
	line down from B3.s
B5:	box invis
##
B2:	box "TS-user" with .w at (B1.e.x+3*linewid, B1.e.y)
	line down from B2.s
B4:	box "TS-provider" "(server)"
	line down from B4.s
B6:	box invis
##
	line dashed from (B1.w.x-linewid/2, (B1.s.y+B3.n.y)/2) \
		    to	 (B2.e.x+linewid/2, (B2.s.y+B4.n.y)/2)
	move to (B2.e.x, (B2.s.y+B4.n.y)/2) \
	    "\begin{tabular}{c}TSAP interface\\ \cite{ISO.TP.Service}\end{tabular}" ljust
##
	line dashed from (B3.w.x-linewid/2, (B3.s.y+B5.n.y)/2) \
		    to	 (B4.e.x+linewid/2, (B4.s.y+B6.n.y)/2)
	move to (B4.e.x, (B4.s.y+B6.n.y)/2) \
	    "\begin{tabular}{c}TCP interface\\ \cite{TCP}\end{tabular}" ljust
##
	line from B3.e to B4.w dashed \
	    "{\em magic box\/} protocol" ""
##
B7:	box "The TCP" with .nw at B5.nw width (B6.ne.x-B5.nw.x)
##
	move to (B3.nw.x, B3.n.y+lineht/4); "OSI TSAP\ " rjust
	arrow from (B3.nw.x, B3.n.y+lineht/4) to (B3.n.x-linewid/10, B3.n.y+lineht/4)
	move to (B3.sw.x, B3.s.y-lineht/4); "TCP port 102\ " rjust
	arrow from (B3.sw.x, B3.s.y-lineht/4) to (B3.s.x-linewid/10, B3.s.y-lineht/4)
##
lineht	=	2/lineht*3
.PE

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