MCS11 could refer to different things depending on the context. One possibility is that it's part of the 802.11ax Modulation and Coding Scheme (MCS) table, which defines data rates for Wi-Fi 6 networks.

Modulation Type: 1024-QAM (Quadrature Amplitude Modulation)

Coding Rate: 5/6

Channel Bandwidths Supported: 20 MHz, 40 MHz, 80 MHz, 160 MHz

Maximum Data Rate: Up to 9607.8 Mbps (with 8 spatial streams on a 160 MHz channel)

Spatial Streams: Supports up to 8 simultaneous streams

Guard Interval: 0.8 µs, 1.6 µs, or 3.2 µs (varies by implementation)