Select EDR, HDR and NDR Links by the Endpoint Contract

An interconnect selection starts with two endpoints, not with the highest bandwidth printed in a catalog. Record the protocol, lane generation, physical cage and intended logical port mode at each end. Then identify whether the connection is a straight link, an electrical breakout or a passive optical fan-out.

The added products illustrate three different generations. MCP1600-E001E30 and MCP1600-E003E26 provide passive QSFP28 copper links for 100G EDR with four 25G-NRZ lanes. MFS1S00-H020V provides a straight 200G QSFP56 active optical path with four 50G-PAM4 lanes. MFS1S50-H010V uses that newer lane generation to create two 100G branches, each with two lanes. Those branch links are not interchangeable with a four-lane 100G QSFP28 connection merely because their total rate is identical.

At NDR, MCP4Y10-N002 provides a twin-port switch interlink, while MCP7Y00-N002 distributes an eight-lane head into two four-lane 400G tails. Both are copper assemblies, but their topology and thermal shells differ. The former has two finned ends; the latter has a finned head and flat tails. The cable schedule should identify each end explicitly.

Optical selection adds another contract. MFP7E20-N010 is passive multimode splitter fiber, whereas MFP7E30-N030 is straight single-mode fiber. Neither includes an OSFP or QSFP optical engine. Specify the engines, fiber type, connector polish and crossover map together. For MMA4Z00-NS, use its multimode optical requirements and the documented straight-versus-splitter configuration rules.

Before acceptance, compare the exact ordering suffix with the selected firmware matrix, preserve any lifecycle context and validate each branch at its intended rate. Keep product specifications separate from offered-unit condition and commercial availability. This checklist is an engineering selection method based on documented products; it does not assert a particular customer deployment or a performance improvement.

Scope: Original engineering article based on manufacturer manuals; no fabricated deployment result or owned-customer success claim.

Public references

• MCP1600-E0xxEyy 100Gb/s QSFP28 DAC Cable Product Specifications: Introduction
• MFS1S00-HxxxV 200Gb/s QSFP56 MMF AOC Product Specifications | MFS1S00-HxxxV 200Gb/s QSFP56 MMF AOC Product Specifications
• MFS1S50-H0xxV 200Gb/s QSFP56 to 2x100Gb/s QSFP56 Low Latency MMF AOC Product Specifications | MFS1S50-H0xxV 200Gb/s QSFP56 to 2x100Gb/s QSFP56 Low Latency MMF AOC Product Specifications
• MCP4Y10-Nxxx Twin-port 2x400Gb/s OSFP to 2x400Gb/s OSFP Passive DAC Product Specifications | MCP4Y10-Nxxx Twin-port 2x400Gb/s OSFP to 2x400Gb/s OSFP Passive DAC Product Specifications
• MCP7Y00-Nxxx 800Gbps Twin-port 2x400G OSFP to 2x400G OSFP Passive DAC Splitter | MCP7Y00-Nxxx 800Gbps Twin-port 2x400G OSFP to 2x400G OSFP Passive DAC Splitter
• NVIDIA MFP7E20-Nxxx Optical Multimode Splitter Fiber Cable Product Specifications | NVIDIA MFP7E20-Nxxx Optical Multimode Splitter Fiber Cable Product Specifications
• NVIDIA MFP7E30-Nxxx MPO-to-MPO Single-mode Fiber Cable Product Specifications | NVIDIA MFP7E30-Nxxx MPO-to-MPO Single-mode Fiber Cable Product Specifications
• MMA4Z00-NS Overview