
Issue 11
© Solarflare Communications 2014
32
Solarflare Server Adapter
User Guide
The tables below summarizes the speeds supported by Solarflare network adapters.
100Base-T in a Solarflare adapter back-to-back (no intervening switch) configuration will not work
and is not supported.
Table 11: SFN5xxx,SFN6xxx and SFN7xxx SFP+ QSFP+ Adapters
Supported Modes
Auto neg speed
Speed
Comment
QSFP+ direct attach cables
No
10G or 40G
SFN7142Q
QSFP+ optical cables
No
10G or 40G
SFN7142Q
SFP+ direct attach cable
No
10G
SFP+ optical module (10G)
No
10G
SFP optical module (1G)
No
1G
SFP+ optical module (10G/1G)
No
10G or 1G
Dual speed modules run at
the maximum speed (10G)
unless explicitly configured to
the lower speed (1G)
SFP 1000BASE-T module
No
1G
These modules support only
1G and will not link up at
100Mbps
Table 12: SFN5121T, SFN5151T, SFN5161T 10GBASE-T Adapters
Supported Modes
Auto neg speed
Speed
Comment
100Base-T
Yes
100Mbps
Typically the interface is set
to auto negotiation speed
and automatically selects the
highest speed supported in
common with it’s link partner.
If the link partner is set to
100Mbps, with no autoneg,
the adapter will use “parallel
detection” to detect and
select 100Mbps speed. If
needed any of the three
speeds can be explicitly
configured
1000Base-TX
Yes
1Gbps
10GBase-T
Yes
10Gbps