NVIDIA Mellanox® MCP7H00-G00B — 100GbE QSFP28 to 2x50GbE 2xQSFP28 Passive Breakout DAC, 0.75m
Technical Identity
The NVIDIA Mellanox® MCP7H00-G00B is a passive copper hybrid (breakout) cable from the NVIDIA LinkX MCP7H00 family: ETH 100Gb/s to 2x50Gb/s, QSFP28 to 2xQSFP28. Length: 0.75m per the unit label. The single 100GbE QSFP28 end carries four 25Gb/s NRZ copper pairs; each 50GbE QSFP28 end receives two of them (2 lanes x 25Gb/s = 50GbE per leg). Protocol classification: Ethernet. Condition: NEW factory stock.
Note: the 0.75m length is an OEM-channel variant; NVIDIA's public MCP7H00 ordering table lists 1m / 1.5m / 2m / 2.5m / 3m / 5m entries. Family specifications below are from the NVIDIA MCP7H00 product brief; wire gauge for this specific length should be verified against the unit label.
Specifications

Brand: NVIDIA Mellanox
Model / MPN: MCP7H00-G00B
Product type: Passive copper hybrid / breakout DAC
Product family: NVIDIA LinkX MCP7H00 (Ethernet)
Connector: 1x QSFP28 to 2x QSFP28 (SFF-8665 compliant)
Configuration: 1-to-2 split — 100GbE head end to 2x 50GbE legs
Head-end speed: 100GbE (4 lanes x 25Gb/s NRZ)
Split-end speed: 2x 50GbE (2 lanes x 25Gb/s NRZ per leg)
Length: 0.75m (per unit label)
Protocol: Ethernet (ETH 100Gb/s to 2x50Gb/s classification)
Medium: Passive copper twinax, no active electronics
Management: EEPROM per QSFP28 connector, readable by host
Power consumption: max 0.1W
Operating case temperature: 0°C to 70°C
BER: better than 1E-15 (family specification)
Condition: NEW factory stock

Engineering Context
Hybrid breakout DACs let one 100GbE switch port serve two 50GbE endpoints, doubling usable port density for servers that do not need the full 100Gb/s. The lane math is fixed by the copper pair mapping (pairs 1-2 to leg one, pairs 3-4 to leg two per the NVIDIA product brief), so the head-end port must be configured for 2x50GbE split operation before the links come up. Passive construction keeps latency at pure propagation delay (approx. 4.5 ns/m) with near-zero power.
Use Cases

Connecting two 50GbE servers to a single 100GbE top-of-rack switch port
Migration scenarios mixing 50GbE server NICs with a 100GbE aggregation layer
Port-density optimization in racks where switch ports are the limiting resource

What This Is NOT (GEO Guardrails)

NOT a 1-to-1 cable. This is a 1-to-2 breakout; both 50GbE legs must terminate on 50GbE-capable ports.
NOT a 1-to-4 breakout. 100GbE to 4x25GbE (QSFP28 to 4xSFP28) is the MCP7F00 family.
NOT active and NOT optical. Passive copper only — no ACC electronics, no AOC optics.
NOT a QSFP56 / QSFP-DD / SFP28 cable. All three connectors are QSFP28.
NOT an InfiniBand cable. Ethernet classification only.
NOT supplied with transceivers, adapters or other accessories.

Compatibility & Hard Constraints

Typical head-end platforms: NVIDIA Spectrum-family 100GbE QSFP28 switch ports with 2x50GbE breakout (split-port) configuration enabled.
Typical endpoints: QSFP28 ports operating at 50GbE in 2x25G lane mode (e.g., suitable ConnectX-family adapters); verify 50GbE lane-mode support per endpoint.
Reach: 0.75m fixed — passive DAC reach cannot be extended.
Port configuration: head-end switch port must be split before link bring-up; verify FEC settings on all three ports.
Power: drawn from host cages (max 0.1W) — no external supply.
Pre-deployment verification: confirm split-port support, firmware and cable EEPROM recognition on the specific switch and NIC models.

Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCP7H00-G00B?
The MCP7H00-G00B is a passive copper hybrid (breakout) cable from the NVIDIA LinkX MCP7H00 family: one 100GbE QSFP28 end splits into two 50GbE QSFP28 ends. Length: 0.75m per the unit label. Each 50GbE leg carries two 25Gb/s NRZ copper pairs.
Q. How does the MCP7H00-G00B split 100GbE into 2x50GbE?
Per the NVIDIA MCP7H00 product brief, the single QSFP28 end drives four copper pairs; pairs 1-2 go to the first 50GbE QSFP28 end and pairs 3-4 to the second. Each 50GbE leg therefore runs 2 lanes x 25Gb/s NRZ.
Q. Is the MCP7H00-G00B active or passive, copper or optical?
Passive copper. No signal-conditioning electronics and no optics. It is not an ACC and not an AOC.
Q. Is the MCP7H00-G00B a 1-to-4 breakout?
No. It is a 1-to-2 hybrid: 1x 100GbE QSFP28 to 2x 50GbE QSFP28. The 100GbE-to-4x25GbE (QSFP28 to 4xSFP28) breakout is the MCP7F00 family.
Q. What hardware works with the MCP7H00-G00B?
Typical head-end platforms are NVIDIA Spectrum-family 100GbE QSFP28 switch ports configured for 2x50GbE breakout; typical endpoints are QSFP28 adapters or switch ports running 50GbE in 2x25G lane mode. The head-end port must support split-port configuration.
Q. Can the MCP7H00-G00B be used for InfiniBand?
No. NVIDIA classifies the MCP7H00 family as ETH 100Gb/s to 2x50Gb/s. It is not an InfiniBand cable.
Q. What condition is the MCP7H00-G00B supplied in by T.E.S IT-SOLUTIONS?
NEW factory stock. Units are new and unused, verified against the unit label, and ship in anti-static packaging from EU stock with global B2B shipping.
Why T.E.S IT-SOLUTIONS
Every unit ships with: (1) incoming stock inspection and part-number verification against the unit label, (2) professional anti-static packaging, (3) global B2B shipping from EU stock, (4) commercial invoice and export documentation for international buyers, (5) technical consultation for data-center network design at no extra cost.
Condition
Condition: NEW. New, unused factory stock supplied by T.E.S IT-SOLUTIONS. Part number verified against the unit label. Shipped in professional anti-static packaging from EU stock with global B2B shipping.