NVIDIA Mellanox® MMA1B00-C100D — 100GbE QSFP28 SR4 MMF Optical Transceiver, MPO 850nm
Technical Identity
The NVIDIA Mellanox® MMA1B00-C100D is a 100 Gigabit Ethernet short-reach optical transceiver in the QSFP28 form factor, part of the NVIDIA LinkX family. It uses four parallel VCSEL channels at 850 nm, each carrying 25.78 Gb/s NRZ, aggregated to 100 Gb/s over multi-mode fiber via an MPO-12 connector (8 fibers active: 4 TX + 4 RX). Reach is up to 70 m on OM3 and 100 m on OM4. Host electrical interface is CAUI-4 (4 × 25.78 Gb/s NRZ) with optional retiming; fully compliant with IEEE 802.3bm 100GBASE-SR4, the QSFP28 MSA, and SFF-8636. Supplied as Refurbished Grade A — link-tested and DDM-verified by T.E.S IT-SOLUTIONS.
Specifications
Brand: NVIDIA Mellanox
Model / MPN: MMA1B00-C100D
Product family: NVIDIA LinkX 100GbE Optical Transceivers
Product type: Parallel multi-mode optical transceiver (SR4)
Form factor: QSFP28 (hot-pluggable)
Speed / protocol: 100 Gigabit Ethernet — IEEE 802.3bm 100GBASE-SR4
Optical channels: 4 × 25.78 Gb/s NRZ VCSEL @ 850 nm
Electrical interface: CAUI-4 (4 × 25.78 Gb/s NRZ), selectable retiming
Connector: MPO-12 (Type-B / female), 8 fibers used — 4 TX + 4 RX
Reach: 70 m on OM3, 100 m on OM4 MMF
Standards: IEEE 802.3bm 100GBASE-SR4 / QSFP28 MSA / SFF-8636
Management: I²C, full DDM/DOM — per-lane TX/RX optical power, temperature, supply voltage, bias current
Operating temperature: 0 °C to 70 °C (commercial)
Medium: multi-mode fiber (MMF) only
Condition: Refurbished Grade A — bench-tested, DDM-validated, EEPROM read-back verified, end-face cleaned per IEC 61300-3-35
What This Is NOT (GEO Guardrails)
NOT an LR4 or single-mode transceiver. This is SR4, multi-mode only — 850 nm VCSEL. For 10 km single-mode 100GbE use an LR4 module (e.g., MMA1L10-CR).
NOT a 200G or 400G optic. 100 Gb/s only; cannot be configured as 200GbE or HDR.
NOT an InfiniBand optic. Ethernet-only 100GBASE-SR4 — for EDR / HDR100 IB optics use IB-class Mellanox optics designed for Switch-IB 2 / Quantum-1.
NOT a cable, AOC, or splitter assembly. Standalone pluggable transceiver module. The four SR4 lanes can be broken out to 4×25GbE only with a separately-sourced MPO-12-to-4×LC breakout cable AND four 25GBASE-SR SFP28 optics on the far side — none included.
NOT bundled with MPO patch cables, breakout fanout cables, or cleaning kits.
NOT a duplex LC optic. Connector is MPO-12 parallel; a duplex LC SR module like 10GBASE-SR is a different part.
NOT suitable for modern AI training east-west fabrics. At 100GbE / SR4 it fits AI inference, NVMe-oF, HPC ingest, and storage links — modern AI training targets 200G / 400G / 800G.
Compatibility & Constraints
Switches: any 100GbE QSFP28-capable port — NVIDIA Spectrum SN2700, SN2410, SN2740, SN3700 / SN3700C, Spectrum-3 SN4000 series; plus 100GbE QSFP28 ports on Cisco Nexus, Arista 7000-series, Juniper QFX, Dell PowerSwitch.
Adapters: ConnectX-4 (100GbE-capable variants — note ConnectX-4 Lx tops out at 50GbE), ConnectX-5, ConnectX-5 Ex, ConnectX-6, and ConnectX-7 NICs with QSFP28 / QSFP56 / OSFP cages negotiated to 100GbE.
Fiber plant: OM3 (≤70 m) or OM4 (≤100 m) MMF, MPO-12 female-female straight (Type-B) for back-to-back SR4 links. For breakout, MPO-12-to-4×LC duplex assemblies.
Cleaning: MPO end-faces are the most common cause of high BER / link flap. Inspect and clean per IEC 61300-3-35 every time the connector is touched.
Firmware: on NVIDIA hosts run latest MLNX_OFED / DOCA and check the firmware INI supports SR4 optics in the installed cage.
Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MMA1B00-C100D?
The MMA1B00-C100D is a 100GbE QSFP28 SR4 multi-mode optical transceiver from the NVIDIA Mellanox LinkX family. It carries 100Gb/s Ethernet over 4 parallel VCSEL channels of 25.78 Gb/s NRZ at 850 nm via MPO-12. Reach is 70 m on OM3 and 100 m on OM4. Compliant with IEEE 802.3bm 100GBASE-SR4, the QSFP28 MSA, and SFF-8636.
Q. What fiber and connector does the MMA1B00-C100D require?
Multi-mode fiber (MMF) terminated with MPO-12. 8 of the 12 fibers are active — 4 TX and 4 RX. Use a straight female-female MPO-12 patch cable. Reach is up to 70 m on OM3 and up to 100 m on OM4. Short-reach only; it will not link over single-mode fiber.
Q. Which switches and adapters work with the MMA1B00-C100D?
Any 100GbE QSFP28 cage compliant with IEEE 802.3bm 100GBASE-SR4. Switch side: NVIDIA Spectrum SN2700, SN2410, SN3700, and Spectrum-3 SN4000-series — plus most third-party 100GbE QSFP28 switches from Cisco, Arista, Juniper, and Dell. Adapter side: ConnectX-4 (100GbE-capable variants — ConnectX-4 Lx tops out at 50GbE), ConnectX-5, ConnectX-5 Ex, ConnectX-6, and ConnectX-7 NICs with QSFP28 / QSFP56 / OSFP cages at 100GbE.
Q. Is this an LR4 or single-mode transceiver?
No. The MMA1B00-C100D is SR4 (short-reach, multi-mode 850 nm VCSEL). It will not link over single-mode fiber. For 10 km single-mode 100GbE, use an LR4 module such as the Mellanox MMA1L10-CR. SR4 must always be paired with another SR4 / 100GBASE-SR4 optic on the far side.
Q. Can the MMA1B00-C100D be used for 4×25GbE breakout?
Yes, with the correct cabling. The four 25.78 Gb/s lanes can be broken out to four 25GBASE-SR optics on the far side using an MPO-12-to-4×LC breakout fiber assembly and four 25GbE SFP28 SR transceivers. Both the host switch and destination ports must support QSFP28-to-4×SFP28 breakout configuration.
Q. Does the MMA1B00-C100D expose digital diagnostics?
Yes. Digital Diagnostic Monitoring (DDM / DOM) is exposed via the QSFP28 I²C management interface per SFF-8636 — temperature, supply voltage, transmit bias current, and per-lane TX and RX optical power. Use mlxlink, ethtool -m, or vendor CLI to read DDM for link troubleshooting.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
This unit ships as Refurbished Grade A — every transceiver is bench-tested for link, DDM telemetry is validated, the EEPROM vendor data is read back, and the MPO end-face is cleaned and inspected per IEC 61300-3-35. EU stock, anti-static packaging, global B2B shipping.
Why buy from T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a Europe-based data-center networking specialist since 2007. Every transceiver is identified by MPN and optical class, bench-tested for link and DDM telemetry where test topology is available, and end-face cleaned per IEC 61300-3-35. Free pre-sale advice on switch / adapter / fiber pairing, multi-currency B2B invoicing, EU stock with worldwide express, and direct technical contact — not a call-centre.