cable backplane for open rack
TRANSCRIPT
Cable Backplane for Open RackOCP Rack & Power Group DiscussionMay 8, 2019
Francis LamDirector, Intelligent Computing Product ManagementHuawei Technologies
40-U Server/BBU
Modules
TOR Switch
48VDC PSU
Liquid Cooling Manifold
48VDC Bus Bar
High Speed Cable
Backplane
Conforms to Open Rack v2.1 Specification
Enhanced Open Rack for Huawei Cloud
Rear ViewFront View
Blind-Mate
Change
To adopt RU to
increase density
Recommendation
ORv3 to allow flexibility
for RU and OU
Change
Move TOR from top to
center for SI
Recommendation
ORv3 to allow flexibility
TOR, PSU location
Cabling Topology
Customize TOR Switch Cable
Backplane
Server Node
C C C CNIC
SFP/QSFP Connector
CCable Connector
Solution 1:
Blind-mate
Custom
TOR Switch
Solution 2:
Octopus
cable to
standard or
custom
TOR switch
TOR Switch Adaptor Cable
BackplaneC
Standard TOR
Switch
Server Node
CNIC
Change
Adopt cable connector
on TOR and backplane
Recommendation
ORv3 to allow flexibility
for connections
between backplane
and TOR
Cable Solution1 Example
Server Node 1TOR Switch 1 TOR Switch 2 Blind Mate Connector
NIC1
NIC2
BMC
CPU
Connector
CPU
Rack Side Nodes
TOR Switch Adaptor Cable
BackplaneC
Standard TOR
Switch
Server Node
CNIC
Cable Backplane Solution
Connector to Cable Backplane
Cable Backplane
Cable Backplane to TOR • The physical location of the cable
backplane with respect to the rack
• The opening dimensions and locations
and boundary conditions for the cable
backplane connectors
• The physical location and boundary
conditions of the Cable Connector with
respect to the compute module chassis
• Supplier and model of connectors to allow
innovation
• Cabling topology to TOR – e.g. custom
switch with single connector vs. standard
switch custom switch; octopus cable vs
custom cable with single switch side
connector
Recommendation
ORv3 to Define
Recommendation
ORv3 to allow flexibility for
Cable Backplane Design
TOR Switch Management Switch
TOR Switch
Connectors to Server Node
• 16 pairs high speed SERDES, support 25Gb NRZ,56G PAM4
• AWG30 for 25G lines, AWG28 for 56G lines
• 2 pairs SERDES for BMC Gb Ethernet
• 1 pair for I2C management
• 1 present signal
• 1 throttling signal
Connectors to TOR Switch
• 8 x 40 pairs high speed SERDES, support 25Gb NRZ,56G PAM4
• 32 pairs for stack
Connector to Management Switch
• 2 x 40 pairs Gb SERDES;
• 160 IO signals
Design may be subjected to change
Change
• 2 data TOR Switch
• 1 management Switch
• 40 Server Nodes