PXH840 User’s Guide –
Dolphin Interconnect Solutions
Page 11
NTB Use Cases Summary and Settings
The PXH840 card may be used in the following use cases as summarized in Table 2: Use Case DIP switch settings below.
Use
case
Description
DIP switch setting
A
Two node NTB configuration. Both
systems have PXH840 installed.
OPT2 on if long cables
All other off
B
Three node NTB configuration. All systems
have a PXH840 installed
OPT1 on to enable two x8 links
OPT2 on if long cables
All other off
Table 2: Use Case DIP switch settings
Use Case A - 2 Node Configuration
–
NTB Mode
Each node has a PXH840 adapter and a direct x4, x8 or x16 cable connection to the other system. This configuration is fully
supported by all Dolphin software, from version DIS 5.5.0 and newer. Both PXH840 adapter cards operate in NTB mode. The DIP-
Switch is set to all off.
Connecting the cables for 2 Node Configurations, x16 link
To establish an x16 link, a given port number should be
connected to the same port number on the other card.
Table 3: Required x16 cabling. Always connect a cable
from Port #x to Port #x
Port,
Host
A
Port,
Host
B
P1
P1
P2
P2
A failure connecting any of the cables will cause the link
to re-train to x8 or x4.
Connecting the cables for 2 Node Configurations, x8 link
To establish an x8 link, please connect a cable from port 1 to port 1 on the other card
. If the card is populated with 4 FireFly’s, you
can connect the cable between any port.
Connecting the cables for 2 Node Configurations, x4 link
To establish an x4 link when in dual port mode, please connect
port 1 to port 1. If the card is equipped with 4 FireFly’s, you can
connect the cable between any ports.
