IBM 90Y3477 — Flex System EN6131 40Gb Ethernet Switch Module
Identity
This listing is for an OEM service part carrying the printed part number 90Y3477, an IBM / Lenovo Flex System component. It is identified consistently across the reseller market as the Flex System EN6131 40Gb Ethernet Switch. The functional detail below is taken from Lenovo Press product guide TIPS0911 for the EN6131, which is official vendor documentation for that switch. Note the caveat: Lenovo lists the EN6131 switch itself under part number 90Y9346, and 90Y3477 appears across the trade as the associated IBM/Lenovo service number for the same switch — T.E.S has not corroborated that mapping against a Lenovo parts document. T.E.S confirms the exact model from the unit label before dispatch.
What is confirmed about 90Y3477
The printed part number is 90Y3477, an IBM / Lenovo Flex System part, identified across the market as the Flex System EN6131 40Gb Ethernet Switch.
Per Lenovo Press TIPS0911, the EN6131 offers 14 internal and 18 external 40 Gb Ethernet ports, enabling a non-blocking network design.
Per the same guide, the 14 internal full-duplex 40 Gigabit ports auto-negotiate at 10, 20 or 40 Gbps, plus one internal full-duplex 1 GbE port connected to the chassis management module.
Per the same guide, the 18 external ports take 40 Gb Ethernet QSFP+ transceivers or QSFP+ DAC cables and auto-negotiate at 10, 20 or 40 Gbps, plus one external 1 GbE RJ-45 port for switch configuration and management.
Per the same guide, there is one RS-232 serial port on a mini-USB connector as an additional configuration path.
It is a Flex System chassis I/O module. It is not a standalone rack switch and not a pass-thru module.
What is not yet confirmed
This list is deliberate. It is what T.E.S could not establish from documentation, and it is read off the physical unit before dispatch rather than guessed at here.
Whether 90Y3477 is the option number or the service number for the EN6131. Lenovo Press documents the switch under 90Y9346; T.E.S could not resolve the relationship between the two numbers from vendor documentation.
Whether this physical unit is the EN6131 40Gb Ethernet switch or its close sibling the IB6131 40Gb InfiniBand switch. The two share firmware packaging in Lenovo's download catalogue and are physically similar; Ethernet and InfiniBand are not interchangeable, and the module marking is what settles it.
Firmware level, and any residual configuration left by the previous owner.
Which Flex System chassis it was pulled from, and the running hours behind it.
QSFP+ transceivers and DAC cables are not included and are not implied. Lenovo Press states explicitly that they must be purchased separately for this switch.
Request label photos before you order
Ask us for photographs of this unit's product label and we will send them before you commit to anything. This is a single unit, and the EN6131-versus-IB6131 question decides whether you get Ethernet or InfiniBand. We will photograph the module marking, the full label and the QSFP+ port face before you commit. If the label does not match what is described on this page, we say so and re-quote or cancel — we do not ship a substitute and hope it fits. Quote part number 90Y3477 when you contact us.
Frequently asked questions
What exactly am I buying with 90Y3477?
A refurbished IBM / Lenovo Flex System I/O module whose printed number is 90Y3477, identified across the market as the Flex System EN6131 40Gb Ethernet Switch. Lenovo Press TIPS0911 documents that switch as having 14 internal and 18 external 40 Gb Ethernet ports in a non-blocking design. Lenovo lists the switch itself under 90Y9346, so the 90Y3477 mapping comes from reseller data rather than Lenovo documentation, and T.E.S reads the unit label before dispatch.
How many ports does the EN6131 have?
Per Lenovo Press TIPS0911: 14 internal full-duplex 40 Gigabit ports auto-negotiating at 10, 20 or 40 Gbps, plus one internal 1 GbE port to the chassis management module; and 18 external ports for 40 Gb QSFP+ transceivers or DAC cables, also auto-negotiating at 10, 20 or 40 Gbps, plus one external 1 GbE RJ-45 management port and one RS-232 serial port on a mini-USB connector. Those figures are from Lenovo's own guide for the EN6131.
Is 90Y3477 the Ethernet EN6131 or the InfiniBand IB6131?
Not confirmed from the part number, and this is the key check. Flex System shipped both an EN6131 40Gb Ethernet switch and an IB6131 40Gb InfiniBand switch — they appear together in Lenovo's firmware catalogue and are physically similar, but Ethernet and InfiniBand are not interchangeable protocols. Ask us for the module marking photograph before ordering if your fabric depends on it.
Will T.E.S confirm the exact model before shipping 90Y3477?
Yes, as a standard dispatch step. We read the printed part number and the EN6131 or IB6131 marking off the physical unit before it leaves. If it is the InfiniBand variant rather than the Ethernet switch described here, we contact you before shipping.
Is the 90Y3477 module tested?
It is cleaned, visually inspected and bench-tested where a suitable test topology is available. For a Flex System I/O module that requires a matching chassis on the bench, which is not always available. Ask what was actually done to this unit and we will tell you rather than implying more than was done.
Are QSFP+ transceivers included with 90Y3477?
No. Lenovo Press states that QSFP+ modules and DAC cables are not included with the EN6131 and must be purchased separately. This listing is for the module only. T.E.S carries 40Gb QSFP+ transceivers and DAC cables separately — ask and we will quote them alongside.
Why T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS supplies refurbished enterprise networking and server hardware from EU stock to a B2B market. On OEM service parts whose exact model is not established by the part number alone, we publish what we can verify and name what we cannot, instead of filling the gap with plausible-sounding specifications. Every unit is photographed and its label read before dispatch. If the unit differs from this page, we tell you before we ship.