WPCI 2%.B pz W"S^11>bbu"::Dg1:11bbbbbbbbbb11gggbuuuk1Xubuukuuuk111Rb:bbXbb1bb''X'bbbb:X1bXXXX;.;g:=::m:::mmmmm::::::mm:k1mubububububXubububub11111111bbbbbbbbbuXubbkbuXmmmmumububXXXXbububububbmbbbbbb:k:k::=kmmX:uXb'b:b:b:b'bmbbbb:::uXuXuXuXk:k:k:mbbbmbuXkXkXKQmmmm^b:kbbbbmbA@mmbmmbmmmmmmm:b:mmmbbmmmmmmmmmmmmXXmmmmmmmmmmmmmmmmmmcm`m`mm`m:mmmmmm}}}mjjmmmmmmmmmmmmmmm0mm}mmmmmmmmmmmmmmmmmmmmmmm}Mmmmmmmmmmmmmjmmmtmmmmmmmmm`'mmm`mmjmlWmmmmmmmmmmmmmmmmmmmW`mmmmjmM-lvetica#|x`H1`D4PkCQMS PS Jet Plus /800 II QPJPII.PRSPl`D4PkCg2W_qr|xHelveticaCourier@ ,`H1`D4PkCmQrrr r  @C2 KLG@ ,`H1`D4PkCmQrrr r  @C;,>>> >  @C ` X` hp x (#%'H   x|@  3'3'Standard6'6'StandardC6QMS $=R- Draft Recommendation X.211 <PHYSICAL SERVICE DEFINITION OF OPEN SYSTEMS INTERCONNECTION <FOR CCITT APPLICATIONS1   `  1 Recommendation X.211 and ISO/IEC 10022, Information processing systems Open systems interconnection Physical layer service definition, were developed in close collaboration and are technically aligned. halfduplex (twoway alternate), or simplex (one way); either pointtopoint or multiendpoint; and either synchronous or asyhchronous as appropriate (see Section 8). plexing, they will be conveyed implicitly via the Physical Layer protocol. Note This encompasses various forms of LAN topology (ring/bus).  F-Ԍ by the Network Layer Protocol Control Information being conveyed either via the same PhC (inband signalling), or via a separate PhC (outofband signalling), see Figure 4/X.211. Physical Layer relay systems do not complete the endtoend PhC until Network Layer control actions are completed among the Network Layer entities en route. Deactivation may be accomplished through either Network layer protocol or management actions. of PhPDU transmission. They are required for halfduplex and are optional for duplex and simplex. The PhACTIVATE request primitive requests activation of the PhC. Each direction of transmission is activated independently for halfduplex operation, and both directions of transmission are activated for duplex operation. For halfduplex and simplex operation, the PhACTIVATE request primitive activates the outgoing direction of transmission, and the PhACTIVATE indication primitive indicates activation of the incoming direction of transmission. During halfduplex operation, a PhACTIVATE request cannot be issued by the PhS user after receipt of a PhACTIVATE indication and before the receipt of a PhDEACTIVATE indication primitive.  PhS Activation mode shift: halfduplex receive to halfduplex send or to duplex (without inactive state)  F-Ԍ tion of PhPDU transmission. They are required for halfduplex and are optional for duplex and simplex. The PhDEACTIVATE request primitive requests deactivation of the PhC. Each direction of transmission is deactivated independently for halfduplex operation, and both directions of transmission are deactivated for duplex operation. For halfduplex and simplex operation, the PhDEACTIVATE request primitive deactivates the outgoing direction of transmission, and the PhDEACTIVATE indication primitive indicates deactivation of the incoming direction of transmission. During halfduplex operation, a PhACTIVATE request primitive can be issued by a PhS user after receipt of the PhDEACTIVATE indication primitive.  PhS User Deactivation Mode shift: halfduplex send or duplex to halfduplex receive (without inactive state)