100G QSFP28 DAC

Type: 100G QSFP28 to QSFP28 Direct Attach Copper (DAC) cable
Compliance: IEEE 802.3ba, IEEE 802.3bj, SFF-8436, SFF-8636 and relevant MSA standards
Key Features: Passive/active options, hot-pluggable, I2C control interface, low crosstalk and power consumption
Specs: 100Gbps aggregate rate (4 lanes × 25Gbps), 3.3V power, twinax copper cable, 0~70℃ operating temperature
Applications: 40G/100G Ethernet, InfiniBand QDR, Omni-Path and data center interconnects

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Product Description
Specification
Product Advantage

Product Description

1. Product Overview

This document specifies the technical requirements for 100G QSFP28 to QSFP28 Direct Attach Copper (DAC) cable assemblies, designed for high-speed, short‑reach interconnects in data centers and high‑performance computing environments.

2. Compliance & Standards

• Compliant with IEEE 802.3ba and relevant MSA specifications

• Compliant with SFF‑8436 and SFF‑8636 mechanical and electrical standards

• Supports IEEE 802.3bj Ethernet physical layer requirements

3. Key Features

• Supports 40G Ethernet, 100G Ethernet, InfiniBand QDR, and Omni‑Path applications

• Available in passive and active configurations

• Hot‑pluggable form factor

• I2C two‑wire serial interface for control and monitoring

• Low crosstalk and excellent signal integrity

• Low power consumption

Specification

4. Functional Specifications

4.1 Data Rate & Architecture

• Aggregate data rate: 100 Gbps (4 lanes × 25 Gbps per lane)

• Full‑duplex, 4‑lane differential signaling

4.2 Interface

• Connector: QSFP28 to QSFP28

• Control: I2C‑based management interface for status monitoring

4.3 Electrical Characteristics

• Power supply: 3.3 V

• Low power dissipation (passive types: near zero; active types: low active power)

• Differential impedance: 100 ± 5 Ω

• Compliant with IEEE 802.3bj insertion loss, return loss, and crosstalk limits

4.4 Mechanical

• Cable type: Twinax copper

• Supports standard lengths (typical up to 5 m)

• Minimum bend radius compliant with industry cabling practices

• RoHS compliant

4.5 Environmental

• Operating temperature: 0 °C to +70 °C

• Storage temperature: −40 °C to +85 °C

5. Applications

• 100G Ethernet (100GBASE‑CR4)

• 40G Ethernet

• InfiniBand QDR

• Omni‑Path

• Data center switch‑to‑switch, server‑to‑switch, and storage interconnects

6. Reliability

• Hot‑swap capable

• High signal integrity with low crosstalk

• Stable performance across rated temperature and voltage ranges

Product Advantage

1

High Compatibility: Complies with IEEE 802.3ba, IEEE 802.3bj, SFF-8436, SFF-8636 and relevant MSA standards.
2

Dual Configuration Options: Offers both passive and active versions to meet different application needs.
3

Easy Operation: Hot-pluggable design and I2C two-wire serial interface enable convenient control and monitoring.
4

Excellent Signal Integrity: Features low crosstalk to ensure stable and reliable data transmission.
5

Energy-Saving: Low power consumption, reducing energy costs and environmental impact.
6

Versatile Applications: Suitable for 40G/100G Ethernet, InfiniBand QDR, Omni-Path and data center interconnects.