IPU-POD128 build and test guide
1.1 Acronyms and abbreviations
This is a short list that describes some of the most commonly used terms in this document.
Table 1.1: Glossary
Term
Description
AOC
Active optical cable
BMC
Baseboard Management Controller: standby power domain service processor doing system
hardware management
BOM
Bill of Materials
GCD
A graph compile domain is operated by a single Poplar Instance within the system, either
within a single IPU-M2000 unit or within several units connected by IPU-Link cables
IPU-Gateway
A device that disaggregates the server(s) and the four IPUs in the IPU-M2000 across a RoCE
network, provides external IPU Exchange Memory, and enables IPU scaleout across 100GbE
(GW-Links) for rack-to-rack connectivity
GW-Link
High speed communication links that connect IPU-M2000s horizontally across IPU-POD64
racks. Special cables are required for GW-Links between IPU-M2000 units
IPU-Link
High speed communication links that connect IPUs within an IPU-M2000 and between IPU-
M2000s within an IPU-POD64. Special cables are required for IPU-Links between IPU-
M2000 units
PDU
Power Distribution Unit
RDMA
Remote DMA
RNIC
RDMA Network Interface Controller
RoCE
RDMA over converged Ethernet
ToR
Top of Rack. Often used in combination with the ToR RDMA switch that is placed on top of
the IPU-M2000 stacked units
Version: latest (2021-11-25)
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