Abstract: A network monitoring method and apparatus (61) is disclosed for monitoring communication connections temporarily established over a network (60) between respective pairs of entities for passing protocol data units therebetween. The connections are, for example, conducted in accordance with the TCP/IP protocol suite. The method involves the steps of monitoring the network to identify the protocol data units and the connection to which each such unit relates, and maintaining an active group (67) of call records each representing a respective connection considered to be currently active.

Abstract: A protocol analyzer is provided for monitoring a selected communication connection being conducted in accordance with a predetermined protocol by the exchange of protocol data units between two entities over a data network. The analyzer includes a monitoring device for identifying protocol data units, a protocol-follower conditioned in dependence on said predetermined protocol and operative to follow the progress of the connection as it receives relevant protocol data units from the monitoring device, and an alarm indicating when the sequence of protocol data units diverges from the protocol. The protocol data units are passed through a FIFO store as they are used by the protocol-follower, so that on a protocol violation occurring, the sequence of protocol data units leading up to the violation can be extracted from the FIFO store and displayed.

Abstract: A compartmentalized refrigeration case for cans of beverage and/or food with a handle and straps for portability by hand or over the shoulders. The refrigeration compartments in the interior of the case are formed by at least one horizontal layer of thermoplastic coated, removable, reusable, cooling units shaped to surround standard size beverage cans. The compartments are enclosed by multi-layer panels comprised of a thermally insulating and supportive foam sandwiched between an inner lining of waterproof material and an outer covering of water-resistant, durable fabric. Each refrigeration compartment is accessible through the front panel of the case by an insulated, door with a fastener such as VELCRO adjacent each compartment. This results in a convenient and versatile case, since every can in the case is accessible through one of the doors at all times.