Re: Twinax issues on new 820

["Stefan Tageson" <Stefan.Tageson@xxxxxxxxxxx>]

TEXT:
The new twinax Work Station Adapter cards (2720, 2722, 6180)
and starting with V4R4M0, Work Station Adapter 2746, have three
major new features: 2X mode, Optimized Mode, and dual mode (dual
mode is not available on 2720 IOA). Dual mode allows 2 ports to
be polled simultaneously - in older controllers (eg, 6050) only
1 port out of 8 is being polled at any given time.

These new functions can be disabled for trouble shooting problem
for multiplexors, or for marginal cabling networks.One area that
is a known problem is that some 8 port twinax to fiber optic
multiplexors will not work with 2 ports active simultaneously
(ie, dual mode).

NOTE: This includes the IBM 6299 twinax to fiber multiplexor.
The dual mode of operation needs to be disabled.
NOTE: IF 2X mode is disabled, the WSC will also add more delay
between events to the same port, effectively slowing down the
new hardware to 6050 speeds. This is labeled 2X Mode and Fast
Mode, below.

The following describes the data area that is used for disabling
or enabling the new functions. It is recommended that disabling
these functions be a 'last resort' as performance will be
degraded.

Please note, that if no data area is created for a controller,
all functions are enabled, ie, equivalent to value('000000').

Data Area

1) To create the data area (for CTL01 in this example):

   crtdtaara dtaara(QSYS/CTL01) type(*char) value('FFFFFF')
                                                   É/É/É/
      dual Mode  . . . FF disables, 00 enables -----  ! !
      2X mode  . . . . FF disables, 00 enables -------- !
      Optimized Mode . FF disables, 00 enables ----------

Example: To disable dual mode and optimized mode, for CTL05, use
crtdtaara dtaara(qsys/CTL05) type(*char) value('FF00FF')
Vary the controller off, and back on for the update to take
effect.
    NOTE: The 'FFFFFF' must be upper case only, hex character.

2) To update a data area that has already been created for CTL01

 chgdtaara dtaara(QSYS/CTL01) value('FFFFFF')
 Replace FFFFFF with the desired value.

  Vary controller off, and back on for the update to take effect.

 3) To view a data area that has already been created for CTL01:

    dspdtaara dtaara(QSYS/CTL01)

 NOTE: You must use capital FF not ff.The following message will
       be posted when the controller is varied off/on if you use
       ff:
       msgCPD0084 'FFFFFF' not valid for parameter twnx dtaara.



Good Luck!



Stefan Tageson
Intentia Consulting Sverige AB
Propellergatan 1, SE-211 19 Malmö, Sweden
Phone: +46 (0)40 691 35 00
Cell: +46 (0)733 913 813
Fax: +46 (0)40 691 3900
E-mail: stefan.tageson@intentia.se