The SGI NUMAlink module (router) is an AC-powered NUMAlink3 router which is designated for Origin 300/350 style bricks and is therefore serial number locked to those types of bricks. These routers are similar to the Origin 3000 style routers apart from:
- AC-powered, whereas Origin 3000 "R-brick" has 48VDC connectors for power
- Serial number prefixed with "M", whereas Origin 3000 "R-brick" has prefix "L".
These serial numbers can not be interchanged by the end-user, and neither system will start if NUMAlinked to a brick with the other prefix. Although, there is a workaround to this covered in another article.
The NUMAlink module is a 2U air-cooled device that transfers messages between the Origin 300 base modules via the NUMAlink 3 interconnect. There are two types of NUMAlink modules: an AC-powered NUMAlink module and a DC-powered NUMAlink module. The functionality of these two modules is the same; however, as the names imply, the modules receive power from different sources. The AC-powered router receives AC voltage from a PDU or power strip. The DC-powered NUMAlink module receives DC voltage from a power bay. Either version of the NUMAlink module has an L1 controller with an external USB "Type B" port to allow connections to the L2 (or L3) system controller(s).
The NUMAlink module consists of eight ports. Four of the eight ports (labeled 2, 3, 4, and 5, or B, C, D, and E) are capable of bi-directional transfers of the L1 controller signals of connected modules. These L1 controller signals are routed through an internal USB hub to the same external USB type B port used by the NUMAlink modules L1 controller.
The other four ports on the NUMAlink module (labeled 1, 6, 7, and 8, or A, F, G, and H) cannot directly transfer data to or from the L1 controllers of connected modules. When you expand beyond 4 bricks, you need an external USB-hub to concentrate the other L1's in order for the L2/L3 controller to access those bricks. This is a legacy from the Origin 3000-style "R-brick" which was only intended to use the first four ports for C-bricks (C-to-R connections), whereas the four remaining ports were intended for router interconnect (R-to-R connections) and you didn't need to pass those L1 signals across routers.
This unit was measured using a regular watt-meter plugged into a standard 230V wall outlet:
L1 only: 21W Running: 43W