Supermicro SuperBlade SBM-GEM-X2C+, Руководство пользователя

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Chapter 7: Layer 2/3 Ethernet Switch Firmware
CX4 Cable Length
Stacking is supported with CX-4 cables only. The CX-4 cable used for stacking should
be no more than 3-meters in length, because stacking internally runs at 12-Gbps and
therefore requires a more robust signal than longer cable lengths might provide reliably.
The industry standard stacking cable length is 3-meters.
When used for 10G Ethernet uplinks, the CX-4 ports can be from 1-meter to 12-meters
in length; the maximum CX-4 cable length supported on Supermicro switches is
12-meters.
It is acceptable to use a 1-meter stacking cable for port 1 and a 12-meter uplink cable for
port 2. You will only need to configure the long cable preference for port 2. Do this by
selecting the Port Number in the CX4 C
ABLE
L
ENGTH
screen ( Figure 7-47 ) and then
selecting the "long" option.
This configuration is done on an individual port basis. Thus, you can use "short" for one
port and "long" for the other port. Alternatively you might use both "short" or, if neither
are for stacking, both can be "long" cables.
NOTE: For stacking ports, you do not need to configure CX4 cable length. It is
fixed as "short" for stacking ports.
Figure 7-47. Configuring CX4 Cable Length