OSA-Express overview
OSA-Express® is an integrated hardware feature that provides direct connection to clients on local area networks (LANs). The OSA-Express feature plugs into an I/O slot just like a channel card. Fiber-optic cable connects the OSA-Express feature to the network.
OSA-Express supports direct attachment to Ethernet, token ring, and ATM LANs where clients communicate using SNA or TCP/IP. For details on using either OSA or OSA-Express for SNA, see IBM Open Systems Adapter connections between APPN nodes and Connecting two VTAMs using an external communication adapter. For details on using either OSA or OSA-Express for TCP/IP, see the z/OS Communications Server: IP Configuration Reference. For TCP/IP, OSA-Express can be configured to use IBM® Queued Direct I/O (QDIO) architecture to eliminate the need for channel control words (CCWs) and interrupts, resulting in accelerated TCP/IP data packet transmission.
- Gigabit Ethernet
- Ethernet
- ATM LAN emulation
- Token ring
For details on the hardware and software required to use the OSA-Express feature, see the OSA-Express customer's guide and reference in your hardware library, either z Systems: Open Systems Adapter-Express Customer's Guide and Reference.
To use the OSA-Express feature to communicate using TCP/IP, IBM recommends defining the device to use the QDIO interface. To do this, you must code a TRL definition that contains a QDIO TRLE. To define the OSA-E for IPv4, use device type MPCIPA or interface type IPAQENET in the TCP/IP profile. To define the OSA-E for IPv6, use interface type IPAQENET6 in the TCP/IP profile.
OSA feature | OSA mode 1 | OAT type (Input) | OAT type (Display) | VTAM® TRLE resource definition MPCLEVEL3 | TCP/IP profile (device type) 2 | TCP/IP profile (link type) 2 | TCP/IP profile (interface type)4 | VTAM resource definitions | NDS definitions | Protocol |
---|---|---|---|---|---|---|---|---|---|---|
OSA-Express Gigabit Ethernet | QDIO (IP) a | N/A | MPC (QDIO) | QDIOk | MPCIPAi | IPAQENETj | IPAQENETl | N/A | N/A | IP |
OSA-Express ATM 155 (using TR or ENET LANE) | TCP/IP Passthru b | Passthru | Passthru | N/A | LCSi | ETHERNet, 802.3, ETHERor802.3, IBMTRj | N/A | N/A | N/A | IP |
OSA-Express ATM 155 (using TR or ENET LANE) | SNA b | SNA | SNA | N/A | N/A | N/A | N/A | XCA/SWNET | N/A | SNA |
OSA-Express ATM 155 (using ENET LANE) | QDIO (IP) c | N/A | MPC (QDIO) | QDIO | MPCIPAi | IPAQENETj | N/A | N/A | N/A | IP |
OSA-Express ATM 155 | HPDT ATM Native d | MPC | MPC | HPDT | ATMi | ATMj | N/A | N/A | N/A | IP |
OSA-Express ATM 155 | HPDT ATM Native d | MPC | MPC | HPDT | N/A | N/A | N/A | XCA/SWNET | N/A | SNA |
OSA-Express FENET | TCP/IP Passthru e | Passthru | Passthru | N/A | LCSi | ETHERNet, 802.3, ETHERor802.3j | N/A | N/A | N/A | IP |
OSA-Express FENET | SNA e | SNA | SNA | N/A | N/A | N/A | N/A | XCA/SWNET | N/A | SNA |
OSA-Express FENET | HPDT MPC (IP) e | MPC | MPC (IP) | HPDT | MPCOSAi | OSAENETj | N/A | N/A | N/A | IP |
OSA-Express FENET | HPDT MPC (IP) e | MPC | MPC (IP) | HPDT | N/A | N/A | N/A | N/A | N/A | IP |
OSA-Express FENET | QDIO (IP) f | N/A | MPC (QDIO) | QDIO | MPCIPAi | IPAQENETj | N/A | N/A | N/A | IP |
OSA-Express TR | TCP/IP Passthru g | Passthru | Passthru | N/A | LCS | IBMTR | N/A | N/A | N/A | IP |
OSA-Express TR | SNA g | SNA | SNA | N/A | N/A | N/A | N/A | XCA/SWNET | N/A | SNA |
OSA-Express TR | QDIO (IP) h | N/A | MPC (QDIO) | QDIO | MPCIPA | IPAQTR | N/A | N/A | N/A | IP |
Notes:
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