Technical data

Overview
19
9. Intake baffle This baffle helps enable proper airflow through the rack. Note
that the top of the rack has a vent as well. Airflow is generally
pulled in from the top and middle of the rack and exhausted
through the back and bottom of the rack.
10. Facade The removable facade covers the power supply and router
boards for a module chassis.
11. CrayLink Interconnect
cabling
This is the physical link that enables the different modules in a
rack to communicate and share resources. The CrayLink
Interconnect cable is made up of delicate copper strands. Be
careful when handling this cable.
12. Cable bails The cable bails hold the CrayLink Interconnect cable in place
to prevent the cable from excessive bending, which can cause
damage.
13. Router board The router board ports provide high-speed (1600 MB/sec)
connectivity between Node boards.
There are three types of Router boards: a Null Router, a Star
Router, and a Rack Router board. These router boards are
described in “Router Boards” on page 30.
14. Cable comb cover This removable cover hides the CrayLink Interconnect cable
inside the rack chassis.
15. Cable comb The comb holds the CrayLink Interconnect in place when the
cable is tucked into the grooves
16. Cable door The cable door hides the CrayLink Interconnect routing
between modules.
17. Connector cover The connector cover protects the router board ports and
cabling.
18. Multimodule System
Controller
The MMSC located in the rear of the chassis is a separate
microprocessor-controlled unit that interfaces the individual
MSCs and MMSCs from other systems.
19. Power distribution
unit (PDU)
The PDU is the central power source for the rack. All the
modules and peripherals connect to the PDU. Note that the
PDU has a separate power switch.
Table 2-1 (continued) SGI 2400 and 2800 Major Components
Component Description