OpenSFF Management Module Specification

5. Management Connector Specifications

The 4C+ connector, referred to in this specification as the Management connector, is a card edge interface based on the SFF-TA-1002 specification. It features 168 contacts and supports up to 52 differential pairs of high-speed signals.

5.1 Pin Assignment

The 4C+ connector used in the OpenSFF Management Module follows a standardized pin configuration optimized for signal integrity, interoperability, and power distribution. The layout includes:

• Predefined ground pins distributed throughout the connector to minimize impedance and improve return path quality
• Dedicated power and management pins, which MUST NOT be reassigned for signaling purposes
• High-speed signal lanes arranged in a GSSGSSG pattern to support clean differential pair routing and minimize crosstalk

The MM MUST use the 4C+ pinouts as specified in Figure 5.1.

5.2 Supported Protocols

See OpenSFF Compute Node section 5.1.2.

5.3 Electrical Characteristics

See OpenSFF Compute Node section 5.1.3.

5.4 Mechanical Characteristics

See OpenSFF Compute Node section 5.1.4.