The 914-EX provides two un-switched, low latency 10/100/1000 BASE-T(X) Ethernet links through the 914-HDE
optical port. Both ports are configured for 10/100/1000 BASE-T(X) auto-negotiation by default. Auto-negotiation
settings can be accessed via the 914-X Series Unified Diagnostic GUI when connected to the console 914-HDE
diagnostic port. A standard 8P8C (RJ45) modular jack provides the mechanical interface for the Ethernet port. The
port is auto MDI/MDIX capable and supports jumbo frames up to 9000 bytes. Note: sustained back-to-back jumbo
frames are supported up to 4000 bytes, larger frame sizes require increased interframe gaps. The 914-HDE
motherboard Ethernet port can sustain back-to-back jumbo frames of 9000 bytes if this feature is required for a
given system.
In 914-EX cards with FPGA Firmware 0xB0 or greater, the “Remote Ethernet Link Speed Synchronization” (RLSS)
feature is enabled by default and can be disabled via the GUI. This feature forces the console side 914-EX to match
the speed and duplex settings of the remote side 914-EX. This greatly simplifies the setup and ensures the 914-EX
card adapts to the remotely plugged equipment for lossless communication. This setting is recommended and
should only be disabled if the configuration has another method to ensure link speed symmetry.
When configured for single expansion mode (default), the 914-EX combines the traffic from both Ethernet ports,
along with diagnostic information, onto a single medium speed expansion channel on the 914-HDE. This bandwidth
is dynamically shared between the two Ethernet ports, allowing for total throughput of up to 1000 Mb/s.
Optionally, the 914-EX can be configured for dual expansion mode, which uses two medium speed expansion
channels on the 914-HDE. This mode allows for a full 1000 Mb/s of bandwidth per Ethernet port and is ideal for
high bandwidth video over IP or GigE vision applications. Since the 914-HDE motherboard multiplexes the Ethernet
data from the 914-EX card and other expansion cards in the system, the total system bandwidth usage must be
considered, and be at (or under) the maximum optical bandwidth available for the system. Refer to Section 3.2 for
detailed information 914-X series card bandwidth usage.
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