Introduces pseudo random binary sequences and explains the core idea and technical context. Highlights the main characteristics and usage guidance needed before configuration.
The Pseudo Random Binary Sequence (PRBS) feature provides a robust mechanism for performing data integrity checks on router interfaces by generating and analyzing pseudo-random bit patterns. It operates simultaneously on both the transmit (Tx) and receive (Rx) directions without generating actual client traffic, ensuring that the optical links and interfaces maintain a good state and are error-free.
| Feature Name | Release Information | Feature Description |
| PRBS support for high-speed optical interfaces | Release 25.4.1 | Introduced in this release on: Modular Systems (8800 [ASIC: Q200]) The Pseudo Random Binary Sequence (PRBS) feature provides data integrity checks on router interfaces by generating and analyzing pseudo-random bit patterns, PRBS15 and PRBS31 between the Cisco 88-LC0-36FH router line card and QDD-400G-FR4 optics. CLI: This feature introduces these commands:
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The feature supports PRBS15 and PRBS31 patterns, which correspond to pseudo-random sequences of lengths 2^15-1 and 2^31-1 bits respectively.
PRBS is typically employed during system installations, or when replacing line cards or nodes, especially in Ethernet-based lossless fabric environments such as simple two-tier leaf and spine network designs.