Abstract: A device demultiplexes an optical signal to produce a number of client streams for client devices. The device produces overhead packets for the client devices. The overhead packets are sent using a packet interface on the device. The overhead packets are sent to the client devices with a Virtual Local Area Network Identification (VLAN ID) portion of the overhead packets identify a client device of the client devices.

Abstract: A flexible and expandable system bus for connecting traffic mapping devices to SONET/SDH framing devices. The system bus passes control signals generated by a master device to multiple tributaries to orient them relative to a SONET/SDH frame. These control signals obviate the need for each tributary to perform its own SONET/SDH reconstruction and framing using the A1/A2 bytes. The control signals synchronize the tributaries to a common clock cycle, indicate during which clock cycles the tributary can add or drop data relative to the system bus, and an interface identification signal that transmits values on the system bus. The tributaries monitor the values on the system bus, and when the value associated with each tributary appears on the bus, and the system bus indicates that the current clock cycle is within the SPE portion of the SONET/SDH frame, the tributary adds or drops data relative to the system bus.

Abstract: Systems and methods for encoding and decoding serial bit streams are provided. A parity bit is computed for each nibble, with the parity alternating between odd and even in a regular manner for normal data, and with parity having predetermined different patterns to indicate the start of a packet or the end of a packet. Special code words indicate the idle state and an error state. In some systems an extra vertical parity channel is provided in association with a group of data channels, the vertical parity channel effectively providing a protection channel.

Abstract: A flexible and expandable system bus for connecting traffic mapping devices to SONET/SDH framing devices. The system bus passes control signals generated by a master device to multiple tributaries to orient them relative to a SONET/SDH frame. These control signals obviate the need for each tributary to perform its own SONET/SDH reconstruction and framing using the A1/A2 bytes. The control signals synchronize the tributaries to a common clock cycle, indicate during which clock cycles the tributary can add or drop data relative to the system bus, and an interface identification signal that transmits values on the system bus. The tributaries monitor the values on the system bus, and when the value associated with each tributary appears on the bus, and the system bus indicates that the current clock cycle is within the SPE portion of the SONET/SDH frame, the tributary adds or drops data relative to the system bus.

Abstract: Systems and methods for encoding and decoding serial bit streams are provided. A parity bit is computed for each nibble, with the parity alternating between odd and even in a regular manner for normal data, and with parity having predetermined different patterns to indicate the start of a packet or the end of a packet. Special code words indicate the idle state and an error state. In some systems an extra vertical parity channel is provided in association with a group of data channels, the vertical parity channel effectively providing a protection channel.

Abstract: Systems and methods for encoding and decoding serial bit streams are provided. A parity bit is computed for each nibble, with the parity alternating between odd and even in a regular manner for normal data, and with parity having predetermined different patterns to indicate the start of a packet or the end of a packet. Special code words indicate the idle state and an error state. In some systems an extra vertical parity channel is provided in association with a group of data channels, the vertical parity channel effectively providing a protection channel.