Abstract: A chassis system for housing a plurality of circuit boards, such as PCI standard bus boards, provides a rack-mountable chassis having an open front side and a motherboard with a plurality of board connectors arranged side-by-side with respect to the front end. The boards are mounted in individual frameworks that facilitate ready installation and removal from the chassis. In particular, the chassis includes a plurality of receiving blocks at the bottom rear of the chassis, aligned with each of the motherboard connectors. The receiving blocks receive pivots mounted on the back of each framework. The framework is inserted into, and removed from the front opening of the chassis in an upwardly pivoted position that clears the motherboard connectors and other obstructions in the chassis. The framework is pivoted into and out of engagement with the motherboard when the pivot is located in the receiving blocks. The chassis can include top-mounted tracks. The tracks receive rollers on the framework.

Abstract: A destination station receives from a network a data packet that is transmitted as a plurality of cells and separately encodes each of the received cells, to produce associated, individual c-bit partial CRC remainders, where c is the number of bits in the CRC remainder associated with the packet. These partial CRC remainders correspond to the respective contributions that the cells make to the packet CRC pattern. The encoder appends the partial CRC remainders to the cells, and the station then stores them in an associated memory and links the individual cells to previously stored cells from the same packet with pointers. Once all the cells of a packet are encoded and stored, the destination station retrieves appended partial CRC remainders from the memory, and provides the remainders to a partial CRC encoder. The encoder manipulates the partial remainders and produces a packet CRC remainder.