HP X.25 Release Notes (September 2007)

HP X.25 Release Notes
Known Problems and Workarounds
Chapter 18
Known Problems and Workarounds
Problem
If you use an HP X.25 2-port PCI card (product number J3525A) in some
of the Integrity servers, the system may generate a Machine Check Abort
(MCA).
This problem may occur if the setup includes the following:
• The X.25 card is installed in one of the following HP Integrity
servers:
— Superdome sx2000
— HP Integrity server rx7640
— HP Integrity server rx8640
• Any version of the HP X.25 2-port PCI card (J3525A)
• Any RAD SPS series switch (SPS-12, SPS-3S, or SPS-6)
For more information, see the “Multiprotocol Packet Switches”
section of the RAD Web site at:
http://www.rad.com/Article/0,6583,25075,00.html
• The interface used is either RS-530 or RS-449
This problem occurs because of a design defect in the RAD switch
implementation of the RS-530 and RS-449 interfaces loop-around test
pins. This defect causes excess inflow of current into the X.25 card in
some situations. This problem was observed only in the case of an X.25
card installed either in the sx2000, rx7640 or rx8640 systems, and it
occurred because of the system’s lower short circuit current limit and
threshold voltage.
Workaround
HP recommends inserting a special DB25 male/female mini-adapter,
with pins 18 and 21 disconnected, between the X.25 switch and the cable
connector, as shown in Figure 1-1.