SDISC Assembler Call - NetEx

is being supplied by the user. This keeps the communications link as busy as possible and assures timely arrivalof data to the user.Network Layer ServicesThe network layer software provides link independence for the higher layers of NETEX and assumes responsibilityfor keeping the network interfaces busy. This is an internal layer used only by the internal transportservice, not the end user. The network layer formats the message proper to route the data through the network.If the protocol information overflows the HYPERchannel message proper, the network layer splits thedata transmissions into two driver requests. The network layer also multiplexes network connections overcommon driver connections and manages those driver connections.Driver Sublayer ServicesThe driver sublayer software is the interface between the network sublayer and the physical network device.The driver converts network sublayer I/O for a particular network path into a form which is understandable tothe devices. The driver delivers and receives network messages and associated data to and from the networkadapters. The driver also allows retry and error recovery for network adapters, supports assembly/disassembly,and code conversion options, if these are provided by the adapter type and requested by theuser’s data mode parameter.MAN-REF-H307IP-04 Introduction Page 7