The VSC8151 is a 2.488Gb/s Section Termination device which both monitors and modifies the section and line overhead of a received SONET/SDH signal, and can generate AIS-L maintenance signals for trouble sectionalization. These features allow all section termination requirements to be supported for Operations, Administration, Management, and Provisioning (OAM&P) functions in SONET/SDH terminal and optical networking applications. An integrated 2.488Gb/s serial transceiver isolates the SONET/SDH signal interface, allowing protocol information to be exchanged with programmable logic using a low-speed TTL interface.