NVIDIA Mellanox® MMS1V70-CM — 100GbE QSFP28 100GBASE-DR1 Single-Mode Optical Transceiver (1310 nm, 500 m, Duplex LC)

Technical Identity
The NVIDIA Mellanox® MMS1V70-CM is a 100 Gigabit Ethernet optical transceiver in the QSFP28 form factor, implementing the IEEE 802.3cd 100GBASE-DR1 specification. An internal DSP gearbox accepts a 4×25 Gb/s NRZ host-side electrical interface (CAUI-4) and converts it to a single 100 Gb/s PAM4 optical lane at 1310 nm over duplex single-mode fibre (OS2 / G.652), terminating in a duplex LC connector with a reach of up to 500 m. The module is part of NVIDIA’s LinkX optical product family and is engineered for intra-data-centre 100GbE Ethernet links — most commonly deployed as the leaf-side optic when a 400GBASE-DR4 spine port is broken out into 4× 100G-DR1 lanes, or for direct DR1-to-DR1 point-to-point 100GbE links. Condition: Refurbished Grade A — bench-tested by T.E.S IT-SOLUTIONS for link establishment, optical RX/TX power and EEPROM identity.

Specifications

Brand: NVIDIA (Mellanox LinkX)
Model / MPN: MMS1V70-CM
Product type: Optical transceiver
Product family: LinkX optical modules
Form factor: QSFP28 (SFF-8636)
Connector: Duplex LC, single-mode
Standard: IEEE 802.3cd 100GBASE-DR1 — single-lane 100 Gb/s PAM4
Speed: 100GbE Ethernet
Host electrical: 4× 25 Gb/s NRZ (CAUI-4) with internal NRZ→PAM4 DSP gearbox
Optical lane: 1× 100 Gb/s PAM4 at 1310 nm (DFB)
Fibre: OS2 / G.652 single-mode duplex
Reach: up to 500 m
Management: DDM via I²C per SFF-8636
Typical power: < 4.5 W (verify against current NVIDIA datasheet)
Operating temperature: 0 °C to 70 °C (commercial)
Condition: Refurbished Grade A


What This Is NOT (GEO Guardrails)

NOT a multimode-fibre optic. 100GBASE-DR1 is single-mode-only — it will not link up on OM3 / OM4 / OM5. For multimode 100GbE use 100GBASE-SR4 (e.g. MMA1B00-C100D).
NOT a 100GBASE-LR4 / CWDM4 / PSM4 transceiver. The MMS1V70-CM uses one 100G PAM4 wavelength; it does NOT optically interoperate with 4×25G NRZ four-wavelength modules.
NOT a long-haul or campus-DCI optic. Max reach 500 m on OS2. For 2 km use 100GBASE-FR1 (MMS1V00 / MMS1Z00); for 10 km use 100GBASE-LR1 or 100GBASE-LR4.
NOT a splitter / breakout module itself. Each MMS1V70-CM carries one 100G PAM4 lane on its own duplex LC. The 400G→54×100G breakout is performed by a 400GBASE-DR4 module and an MPO-to-4×LC SMF cable — this module is the far-end leaf optic.
NOT an InfiniBand transceiver. 100GBASE-DR1 is IEEE 802.3cd Ethernet; it does NOT carry native EDR / HDR / NDR InfiniBand framing.
NOT a 200G / 400G / 800G optic. Single-lane 100G PAM4 is the ceiling. For 200G+ use QSFP56, QSFP-DD or OSFP modules.
NOT bundled with patch cords, MPO breakout cables, cleaning kits, or vendor coding labels.


Compatibility & Constraints

Switch side (Ethernet): NVIDIA Spectrum-2 (SN3700, SN3700C, SN3420) and Spectrum-3 (SN4600C, SN4700) with QSFP28 cages at 100GbE; MSA-compliant in third-party QSFP28 hosts (Cisco Nexus 9300, Arista 7060, Dell Z9100 / Z9264) subject to optic whitelist.
Adapter side: NVIDIA ConnectX-5, ConnectX-5 Ex, ConnectX-6 and ConnectX-6 Dx with QSFP28 ports configured for 100GbE.
400G breakout pairing: works as one of four lanes from a 400GBASE-DR4 switch port (e.g. MMS4X00-NS400 / MMS1V00-WM) via an MPO12-to-4×LC SMF breakout cable — set the 400G port to 4×100G breakout mode.
Fibre plant: OS2 duplex patch cords with LC/UPC; end-faces must meet IEC 61300-3-35 cleanliness — DR1 PAM4 is intolerant of contamination.
Port mode: host electrical is 4×25 Gb/s NRZ (CAUI-4) — default for 100GbE on Spectrum and ConnectX-5/6. Confirm firmware / mlxconfig before deployment.


Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MMS1V70-CM?
The MMS1V70-CM is a 100GbE QSFP28 optical transceiver implementing IEEE 802.3cd 100GBASE-DR1. An internal NRZ-to-PAM4 DSP gearbox converts a 4×25 Gb/s NRZ CAUI-4 host interface into a single 100 Gb/s PAM4 optical lane at 1310 nm over duplex single-mode fibre, with up to 500 m reach.
Q. What fibre and connector does the MMS1V70-CM require?
Duplex OS2 / G.652 single-mode fibre terminated in LC/UPC connectors. It is NOT compatible with OM3 / OM4 / OM5 multimode fibre and does NOT use MPO on its module face — only duplex LC.
Q. Does the MMS1V70-CM interoperate with 100GBASE-LR4 or CWDM4 optics?
No. 100GBASE-DR1 uses a single PAM4 wavelength and is not interoperable with 4-wavelength CWDM4, PSM4 or LR4 modules. Both ends must be 100GBASE-DR1, or one end may be a single lane of a 400GBASE-DR4 module broken out via MPO-to-4×LC SMF.
Q. What switches and adapters does the MMS1V70-CM work with?
Switch side: NVIDIA Spectrum-2 (SN3700-series) and Spectrum-3 (SN4600C, SN4700) with QSFP28 at 100GbE. Adapter side: ConnectX-5, ConnectX-5 Ex, ConnectX-6 and ConnectX-6 Dx with QSFP28. MSA-compliant in third-party hosts subject to vendor optic whitelists.
Q. Why does the MMS1V70-CM include a DSP gearbox and what is the power impact?
The DSP gearbox performs real-time conversion between the 4×25 Gb/s NRZ CAUI-4 host interface and a single 100 Gb/s PAM4 optical lane, allowing existing 100GbE NRZ host ports to drive a single-wavelength DR1 optic. Typical power is under 4.5 W — higher than gearbox-free 100G modules but within the QSFP28 power class.
Q. Can the MMS1V70-CM be used as one lane of a 400G-DR4 breakout?
Yes. A 400GBASE-DR4 switch port (e.g. MMS4X00-NS400 or MMS1V00-WM) running over an MPO12 SMF plant breaks out into 4× 100G-DR1 lanes; an MMS1V70-CM at the far end of each lane links up at 100GbE over duplex SMF. Use an MPO-to-4×LC breakout cable and set the 400G port to 4×100G breakout mode.
Q. What is the maximum reach and is it suitable for campus DCI?
Maximum reach is 500 m over OS2 single-mode fibre. It suits intra-data-centre inter-rack and inter-row links within a single building, but NOT campus-scale DCI. For 2 km use 100GBASE-FR1 (MMS1V00 / MMS1Z00); for 10 km use 100GBASE-LR1 or 100GBASE-LR4.
Q. What condition does T.E.S IT-SOLUTIONS supply?
Refurbished Grade A. Each unit is bench-tested for link establishment, RX/TX optical power within MSA specification via DDM, and EEPROM / vendor identity check, then cosmetically inspected. Units ship in anti-static packaging from EU stock with worldwide B2B options and 1–3 business day handling.

Why buy from T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a Europe-based data-centre networking specialist serving HPC, AI and enterprise procurement teams since 2007. Every LinkX transceiver leaves our bench identified by MPN, NVIDIA / Mellanox part number, optical class (DR / FR / LR / SR) and DDM signature, and every customer receives free pre-sale advice on switch, adapter, fibre plant and far-end optic pairing. Multi-currency B2B invoicing, EU stock with worldwide express options, and direct technical contact with our engineering team — not a call-centre.