The VSC8150 monitors an SONET/SDH signal in order to provide section and line data for Operations, Administration, Maintenance, and Provisioning (OAM&P) at multiple SONET/SDH rates. Differential PECL clock and data input receivers and a differential data output isolate the high-speed interface. Low-speed TTL inputs and outputs allow the use of inexpensive programmable logic to perform OAM&P functions. The VSC8150 is an ideal solution for constructing a non-intrusive SONET/SDH monitoring interface when visibility of payload data is not required.