The term "capacity" in the context of a QSFP28 (Quad Small Form-Factor Pluggable 28) transceiver typically refers to its maximum data rate or bandwidth. QSFP28 modules are designed to support high-speed data transmission in networking applications. The capacity of a QSFP28 module is determined by its data rate, and it is commonly used for 100 Gigabit Ethernet (100GbE) connections.

Here are the key specifications related to the capacity of a QSFP28 module:

• Data Rate: QSFP28 supports data rates of up to 100 gigabits per second (Gbps).

• Configuration: QSFP28 modules typically use four electrical lanes, each operating at 25 Gbps. This configuration results in a total aggregate data rate of 100 Gbps.

• Applications: QSFP28 modules are widely used in data centers and high-performance computing environments for high-speed networking applications, including 100GbE connections.

It's important to note that the term "capacity" is often used interchangeably with "data rate" or "bandwidth" in the context of networking transceivers. QSFP28 provides a significant leap in capacity compared to earlier transceiver types like QSFP (which supports up to 40 Gbps) due to its higher data rate and increased lane count. When selecting networking equipment or planning network upgrades, understanding the data rate and capacity of transceiver modules is crucial to ensuring compatibility with the desired network speeds and standards.