IBM AS/400e, User Handbook Manual, Page: 130 / 834

AS/400e server 250
100
AS/400e System Handbook
Workstation Controllers
The Model 250 supports only 5250-type workstations and LAN attachments.
A 5250 twinaxial device or 5250 emulation adapter in a PC supports a single address,
multiple addresses, or shared sessions on a single address. Whenever a device is powered
on or when the 5250 emulation software is started on a PC, each defined address responds
to the workstation controller polls. Therefore, these addresses count as an active address
even when no device description exists on the AS/400 system. This can occur when the
QAUTOCFG system value is set to *NO. Further considerations include:
• When a device has multiple addresses defined for multiple sessions to support jump
screen or to support an attached printer, each session counts towards the maximum
active addresses supported by that workstation controller.
• When a device has a single address defined with shared sessions, that device counts
as one of the maximum active addresses and up to four of the maximum shared
sessions.
There is a maximum of 300 shared sessions per IOP.
When ordered, the Multifunction I/O Processor has a selection of features that determine
whether a 5250-type device (#9720) or Operations Console (#0398) is to be used as a
console.
The following workstation controllers can be attached to the Model 250:
• #2746 PCI Twinaxial Workstation IOA
• #9720 Base PCI WAN/Twinaxial IOA
#2746 PCI Twinaxial Workstation IOA
The #2746 is an 8-port twinaxial workstation IOA with a 20-foot attachment cable for
attaching up to 40 5250-type displays and printers. Each port supports seven attached
addresses allowing for up to 56 attached addresses, of which only 40 can be active. When
the attached display supports address sharing, a maximum of 120 shared sessions are
supported. The #2746 is specified when additional PCI twinaxial workstation controllers are
required and can be installed in either high or low speed slots.
#9720 Base PCI WAN/Twinaxial IOA
The #9720 combined twinaxial and communications adapter is a base option on the Model
250. A cable with a 4-port expansion box comes with this adapter. Each port supports seven
attached addresses, for a total of 28 attached addresses per #9720. When the attached
display supports address sharing, a maximum of 112 shared sessions are supported. This