Abstract: An electronic system includes a backplane, a first plurality of slots coupled to the backplane, the first plurality of slots having a first electrical interface to be coupled to electrical circuit cards of a first type, wherein the electrical circuit cards of the first type receive network data and convert the network data to SONET formatted data, and a second plurality of slots coupled to the backplane, the second plurality of slots having a second electrical interface to electrical circuit cards of a second type. The backplane routes data signals between the first plurality of slots and the second plurality of slots.

Abstract: A serial data signal having a predetermined sequence to indicate a start of a frame of data is received. The serial data signal is compared to a plurality of values. The plurality of values include the predetermined sequence and one or more values representing logical rotations of the predetermined sequence. A match signal is generated in response to the serial data signal matching one of the plurality of values.