ITEM: U6422L

sp1, network connections

Question:

Customer wants to know whether dix connection is supported on the SP2.

Response:

The hardware connection that allows you to use a transceiver to make
the dix (aui) connection to the twisted pair network is available via
RPQ. You need RPQ 8K1939 if you are using the integrated ethernet on
the thin nodes for the connection. You need RPQ 8K1957 to make the
connection via an ethernet card that takes up a slot in either the
wide or thin nodes. However, the software support is not standard and
requires some modification as follows:

1. You cannot specify to the SDR the use of dix for en0/1 via the SMIT
    panels. You have to use SDRChangeAttrValues to modify the Adapter
    class in the SDR.

2. To use the dix connection for the primary ethernet network that
   connects to the control workstation and is used to install the
node,
   you will have to set a jumper on the card in the thin nodes telling
   them to send the bootp broadcast over dix. On the wide nodes, the
   only way to specify the adapter to use is through software when the
   node is setting up to boot. Therefore, wide nodes would require
that
   you use node conditioning to do the initial install and select the
   dix connection for the bootp broadcast. There are customers out
there
   using twisted pair on the SP2, but the use of the connection is not
   standard as you can see. 

Contact your marketing rep for info on RPQ 8K1939 and ordering it. It
is simply the authorization to use twisted pair on the ethernet riser
card on an SP2. You can make the change to the jumpers on the ethernet
card.Normally the jumper could be changed on a standard
RS/6000 by the customer.  However, I STRONGLY recommend that the CE be
contacted to conduct this activity on the SP because the entire node
has to be removed from the rack. This requires all cables including
the switch cable to be removed.



Support Line: sp1, network connections ITEM: U6422L

Dated: June 1995 Category: N/A

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