A data link switching (DLSw) routing information field (RIF) passthru technique provides end-to-end source route information to source and destination endstations coupled to respective local and remote source-route bridge (SRB) subnetworks of a DLSw network. The local and remote SRB subnetworks include respective local and remote DLSw peer switches that communicate over an intermediate wide area nework to form the DLSw network. The source route information describes a complete path between the s…

A process for preparing a 2-chlorosulfinylazetidinone comprises heating in an inert organic solvent a penicillin sulfoxide ester, at a temperature between about 75.degree. C. and 140.degree. C., with an N-chlorohalogenating agent in the presence of a weakly basic N-alkali metal salt of a cyclic imide. The weakly basic N-alkali metal salt of a cyclic imide acts as an acid scavenger to bind the hydrogen chloride which is produced as a byproduct of the reaction. Preferably, the N-chlorohalogenating…

In a direct access storage device having a head for interaction with a storage medium and a moving actuator on which the head is mounted, the improvement comprises a compound bearing system for the actuator, the bearing system including a first bearing of low friction for small movements of the actuator; and a second bearing of higher friction for coarse movements of the actuator. The storage medium is preferably a rotating magnetic disk having a series of concentric circular tracks. A single se…

A motor for incorporation in an actuator pivot includes a coil disk, an upper magnet-yoke disk, and a lower magnet-yoke disk. The coil disk is attached to the pivot shaft to form a shaft-coil assembly. The coil disk includes a plurality of coils, each placed orthogonally to the axis of the shaft. Each coil is configured to receive an electrical current in a first direction. A second coil located diametrically opposite to the first coil is configured to receive a second electrical current in a se…

A process for the manufacture of 7-acylamino-3-hydroxycephem-4-carboxylate-1-oxide in E-rotamer form (Formula III), comprises reacting a 7-acylamino-3-exomethylenecepham-4-carboxylate-1-oxide with ozone in an inert organic solvent in the presence of a catalytic amount of an organic or inorganic base at a temperature ranging from about -80.degree. C. to about +20.degree. C. The E-rotamer (wherein the 3-hydroxy group is strongly hydrogen bonded to the carbonyl of the 4-ester group) exhibits differ…

Systems and methods for retransmitting unsuccessfully transmitted data across a communication link. The retransmission mechanism may be applied to point to multipoint networks including wireless networks. Each packet is encapsulated in an ARQ frame and assigned a sequence number for the purpose of coordinating acknowledgments and retransmissions. Information as to which packets require retransmission is communicated in the form of a bitmap where each bit indicates an acknowledgment status for a …

A process for the manufacture of 7-acylamino-3-hydroxy-cephem-4-carboxylate-1-oxide in E-rotamer form (Formula III), comprises reacting a 7-acylamino-3-exomethylenecepham-4-carboxylate-1-oxide with ozone in an inert organic solvent in the presence of a catalytic amount of an organic or inorganic base at a temperature ranging from about -80.degree. C. to about +20.degree. C. The E-rotamer (wherein the 3-hydroxy group is strongly hydrogen bonded to the carbonyl of the 4-ester group) exhibits diffe…

In a computer apparatus including an enclosure and a direct access storage device mounted within the enclosure, a mounting apparatus for the direct access storage device including: a plurality of a relatively rigid shock isolators and at least one stress sensor mounted in series with are of said shock isolators and disposed between the enclosure and the direct access storage device. The enclosure may include a user frame and the mounting apparatus may be disposed between the direct access storag…

A transparently-bridged wide area network connecting Ethernet/IEEE 802.3-based local area networks uses redundant proxy devices one each LAN for internetwork communications. The proxy devices on a given LAN, implemented as data link switching (DLSw) devices, mediate for proxy services by generation and maintenance of a token between the proxy devices capable of providing the corresponding proxy services. In the case of transfer of a data frame, a proxy device having received a frame from an end …

A transparently-bridged wide area network connecting Ethernet/IEEE 802.3-based local area networks uses redundant proxy devices on each LAN for internetwork communications. The proxy devices, implemented as data link switching (DLSw) devices, prevent looping of traffic such as explorer frames by sharing their MAC addresses to enable the proxy devices to recognize data packets from another proxy device. Incoming explorer frames from the wide area network are modified by performing an address subs…