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NON-QDIO operational mode
The OSA-Express 1000BASE-T Ethernet, Fast Ethernet
and Token-Ring also support the non-QDIO mode of
operation (CHPID type OSE). The adapter can only be set
(via the CHPID type parameter) to one mode at a time.
The non-QDIO mode does not provide the benefi ts of
QDIO. However, this support includes native SNA/APPN,
High Performance Routing, TCP/IP passthrough, and
HPDT MPC. The new OSA-Express 1000BASE-T Ethernet
provides support for TCP/IP and SNA/APPN/HPR up to 1
gigabit per second over the copper wiring infrastructure.
z990 OSA-Express Token-Ring
The same OSA-Express Token-Ring feature is supported
on z990 and z900. This Token-Ring supports a range of
speed including 4, 16 and 100 Mbps, and can operate in
both QDIO and non-QDIO modes.
Note: OSA-Express 155 ATM and OSA-2 FDDI are no
longer supported. If ATM or FDDI support are still required,
a multiprotocol switch or router with the appropriate net-
work interface for example, 1000BASE-T Ethernet, GbE LX
or GbE SX can be used to provide connectivity between
the LAN and the ATM network or FDDI LAN.
Server to User connections
A key strength of OSA-Express and associated Commu-
nications Server protocol support is the ability to accom-
modate the customer’s attachment requirements, spanning
combinations of TCP/IP and SNA applications and
devices. Customers can use TCP/IP connections from the
remote site to either their TCP/IP or SNA applications on
zSeries and S/390 by confi guring OSA-Express with QDIO
and using either direct TCP/IP access or use appropriate
SNA to IP integration technologies, such as TN3270 Server
and Enterprise Extender for access to SNA applications.
Customers who require the use of native SNA-based con-
nections from the remote site can use a TCP/IP or SNA
transport to the data center and then connect into zSeries
and S/390 using appropriate SNA support on OSA-
Express features confi gured in non-QDIO mode.
QDIO Mode - TCP/IP
non-QDIO mode
SNA Passthru
TCP/IP Passthru
HPDT MPC
Server
Server
IP WAN
Intranet
SNA DLSw
TCP/IP
Native SNA
TN3270 browser
access to SNA
appls.
Enterprise
Extender for
SNA end points
TCP/IP
applications
Remote Office
IP WAN
Intranet
Remote Office
4/16 Mbps
Token-Ring
4/16 Mbps
Token-Ring
4/16 Mbps
Token-Ring
4/16 Mbps
Token-Ring
DSLw
Router
16/100 Mbps
Token-Ring
Server
Server
Internet or
extranet
4/16/100 Mbps
Token-Ring
Backbone
Switch/
Hub/
Router
4/16 Mbps
Token-Ring
IP Router
100 Mbps
Token-Ring
10/100 Mbps
Ethernet
10/100 Mbps
Ethernet
Switch/
Hub/
Router
4/16 Mbps
Token-Ring
100 Mbps
Token-Ring
Backbone
Switch/
Hub/
Router