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A Medium Access Control protocol software architecture which comprises a microcode component providing the protocol implementation level functions and an engine component providing hardware level functions. The Medium Access Control protocol and method for use in a network system allows for centrali

A Medium Access Control protocol software architecture which comprises a microcode component providing the protocol implementation level functions and an engine component providing hardware level functions. The Medium Access Control protocol and method for use in a network system allows for centralized management of all MAC-level services by a master device. The Medium Access Control protocol provides an improved protocol message throughput via the sequence retransmission request protocol scheme. The Medium Access Control protocol provides a reduced data transmission latency and provides dynamic allocation of data slots within a Time Division Multiple Access frame definition. The Medium Access Control protocol also provides a set of failure management functions and power control support.

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A Medium Access Control protocol software architecture which comprises a microcode component providing the protocol implementation level functions and an engine component providing hardware level functions. The Medium Access Control protocol and method for use in a network system allows for centrali

A Medium Access Control protocol software architecture which comprises a microcode component providing the protocol implementation level functions and an engine component providing hardware level functions. The Medium Access Control protocol and method for use in a network system allows for centralized management of all MAC-level services by a master device. The Medium Access Control protocol provides an improved protocol message throughput via the sequence retransmission request protocol scheme. The Medium Access Control protocol provides a reduced data transmission latency and provides dynamic allocation of data slots within a Time Division Multiple Access frame definition. The Medium Access Control protocol also provides a set of failure management functions and power control support. terial disposed therein, and varying an electric field imposed across the Stark material. d tip surface corresponds to a segment of a circle having a center on said axis and said engagement is effected by movement of said tip along a line from said center perpendicular to said mold surface, and varying the relationship between the rate of said translating of said mold surface and the rate of said movement of said tip, said cavity thereby having an anamorphic profile. 12. The method according to claim 11 wherein said profile is ellipsoidal. 13. The method according to claim 1 further comprising the steps of moving said mold surface and said tool laterally with respect to each other to successive positions on said mold surface, and repeating said movement into and out of cutting engagement at each of said positions to provide an array of cavities on said mold surface. 14. The method according to claim 13 wherein said tip surface is defined by the end of a radius having its center on said axis of inclination, and said movements are along a line from said center perpendicular to said mold surface, thereby providing a mold with which an array of lenses may be fabricated. 15. The method according to claim 14 wherein said lenses are less than 2 mm in diameter and said array is a microlens array. 16. The method according to claim 14 wherein said lenses are in a range of 0.1 mm to 10 mm in diameter and said array is a microlens array. 17. A method of fabrication of optical devices which comprises the steps of making a mold from which such devices can be fabricated by machining one or more cavities into a substrate from a surface of said substrate using a tool having a cutting surface at a tip thereof which tool is rotatable in a spindle about an axis, tilting said tool so that said axis is inclined to said substrate surface, rotating said tool about said axis, and moving said tool with respect to said substrate to bring said cutting surface into and out of cutting engagement with said substrate, thereby forming one or more cavities in said substrate surface, wherein said cutting surface when rotated about said axis has a point on said axis of substantially zero rotational velocity, and said inclination being sufficient to maintain said point on said axis away from said substrate surface when said cutting surface and said substrate surface are in cutting engagement. 18. The method according to claim 17 wherein said cutting surface is defined by the end of a raduis having the center therof on said axis, and said cutting engagement is effected by movement along a line from said center perpendicular to said substrate surface. 19. The method according to claim 17 wherein said cutting surface defines a segment of a sphere or cylinder and said devices are lenses. 20. The method according to claim 19 wherein said substrate is material selected from machinable metal and plastic and said lenses are positive lenses replicated with said mold by molding processes selected from the group consisting of stamping, embossing and casting using said substrate into said one or more cavities. 21. The method according to claim 19 further comprising the step of replicating negative or concave surface lenses with said mold by fabricating an intermediate mold having convex protuberances corresponding to said one or more cavities, and using said intermediate mold to form lenses having said concave surfaces in another substrate. 22. Apparatus for making one or more optical devices which comprises a substrate of machinable material having a substrate surface, a form tool having a tip providing a cutting surface shape corresponding with a surface shape of said one or more optical devices, means enabling rotation of said tool about an axis inclined, to said substrate surface, at an angle related to the height of the surface of said one or more optical devices to be made using said apparatus, and means enabling reciprocation of said tool to bring said cutting surface into cutting engagement with said substrate such that one or more cavities is formed ther