1. A computer readable medium containing instructions, which, when executed by a computer, generate random jitter test patterns in a P1394b-compliant data communications system having a device under test operatively coupled to second device, by:
generating, by the second device, a sequence of maximum size asynchronous packets according to the P1394b standard; and
transmitting, by said second device, said sequence to the device under test.
2. The computer readable medium of claim 1 wherein said sequence comprises CURRENT_ASYNC requests, ignoring fairness.
3. The computer readable medium of claim 1, wherein said sequence comprises a packet payload containing all zeros.
4. A computer readable medium containing instructions, which, when executed by a computer, generate jitter test patterns in a P1394b-compliant data communications system having a device under test operatively coupled to second device, the device under test having a port_error register and the second device having a data scrambler, by:
disabling the transmitter data scrambler of the second device;
clearing the port_error register of the device under test;
sending, by said second device, a test pattern to said device under test; and
reading the port_error register of the device under test.
5. The computer readable medium of claim 4, wherein the error rate of a jitter test is determined by reading the port_error register.
6. The computer readable medium of claim 4, wherein said test pattern comprises a sequence of at least 42 null packets followed by a packet containing at least 50 bytes of consecutive D21.5 symbols having an 8 bit data value AD16.
7. The computer readable medium of claim 6, wherein said sequence of at least 42 null packets is generated by repeatedly issuing CURRENT_ASYNC requests and providing a zero length PHY packet.
8. The computer readable medium of claim 4, wherein said test pattern comprises a single quadlet PHY packet containing the repeated data byte D30.3 having an 8 bit data value 0x7E.
9. The computer readable medium of claim 8, wherein the total length of said test pattern is at least 167 symbols.
10. The computer readable medium of claim 4, wherein said test pattern comprises two quadlet PHY packets containing the repeated data byte D30.3 having an 8 bit data value 0x7E.
11. The computer readable medium of claim 10, wherein the total length of said test pattern is at least 167 symbols.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of making a metal and non-metallic fiber composite mold comprising the steps of:
(a) providing a matrix having a shape to be molded;
(b) providing an underlying metal layer on said matrix;
(c) placing a sheet over the underlying metal layer, the sheet including a plurality of filaments, said filaments being spaced apart from one another and defining gaps therebetween; and then
(d) spray depositing an additional metal layer by making a plurality of passes with at least one spray gun so that the metal of said additional metal layer merges with the metal of said underlying metal layer in said gaps;
(e) allowing the sheet to remain between the underlying metal layer and the additional metal layer and;
(f) restraining said sheet in position on said underlying layer during at least a part of said step of depositing said additional metal layer, wherein said restraining step includes providing a mesh over said sheet.
2. The method according to claim 1 wherein said step of spray depositing said additional metal layer includes making at least one pass with the spray gun having a spray direction at an oblique angle to a surface defined by the first metal layer and the sheet.
3. The method according to claim 2 wherein said step of spray depositing said additional metal layer includes making a plurality of passes with said spray direction in a plurality of different orientations relative to said surface.
4. The method according to claim 2 wherein said plurality of different orientations include two substantially opposite oblique orientations.
5. The method according to claim 1 further comprising repeating steps (c) and (d) to create a shell.
6. The method according to claim 5 further comprising the step of removing the shell from the matrix to form a mold.
7. The method according to claim 6 further comprising the step of using the mold in a molding process.
8. The method according to claim 5 wherein the shell is at least 0.1 inches thick.
9. The method according to claim 8 wherein the shell is about 0.25 inches thick.
10. The method according to claim 5 wherein the shell has an exterior surface area of at least one square meter.
11. The method according to claim 1, wherein said step of placing a sheet includes the step of separating the filaments of the sheet from one another to form or enlarge said gaps.
12. The method according to claim 1 wherein said step of providing said underlying metal layer includes spray-depositing said underlying metal layer by making a plurality of passes with at least one spray gun.
13. The method according to claim 1 wherein the spray gun is an arc spray gun.
14. The method according to claim 1 wherein the spray gun is a plasma spray gun.
15. The method according to claim 1 wherein the metal layers are constructed from the group consisting of iron, nickel, zinc, aluminum, and copper.
16. The method according to claim 1 wherein the metal layer is constructed from approximately 30-42% nickel.
17. The method according to claim 1 wherein the sheet is a carbon woven fabric.
18. The method according to claim 5 further comprising the step of sealing the shell by impregnating the shell.
19. The method according to claim 18 wherein said step of impregnating the shell includes the step of impregnating the shell with a polymeric material.
20. The method according to claim 18 wherein said step of impregnating the shell includes the step of plating a metal onto the shell.
21. The method according to claim 1 further comprising the step of forming a composite part in said mold.
22. A method of making a metal and non-metallic fiber composition comprising the steps of:
(a) providing a matrix having a shape to be molded;
(b) providing an underlying metal layer on said matrix;
(c) placing a sheet over the underlying metal layer, the sheet including a plurality of filaments; and then
(d) spray depositing an additional metal layer by making a plurality of passes with at least one spray gun so that the metal of said additional metal layer merges with the metal of said underlying metal layer;
(e) allowing the sheet to remain between the underlying metal layer and the additional metal layer; and
(f) during at least a part of step (d), restraining said sheet against said underlying metal layer with a restraining means.
23. A method as claimed in claim 22 wherein said restraining step includes providing a mesh over said sheet so that said mesh substantially conforms to a surface defined by said sheet, said spray-depositing step including directing metal from said spray gun through said mesh.
24. The method as claimed in claim 23 further comprising the step of removing said mesh after depositing an initial portion of said additional metal layer.
25. The method as claimed in claim 22 wherein said step of spray depositing the additional metal layer includes making at least one pass with the spray gun having a spray direction at an oblique angle to a surface defined by the first metal layer and the sheet.
26. The method as claimed in claim 25 wherein said step of spray depositing said additional metal layer includes making a plurality of passes with said spray direction in a plurality of different orientations relative to said surface.
27. The method as claimed in claim 25 wherein said plurality of different orientations include two substantially opposite oblique orientations.
28. The method as claimed in claim 22 further comprising repeating steps (c) and (d) so that the sheets and metal layers form a shell having a desired shell thickness.
29. The method as claimed in claim 28 further comprising the step of removing the shell from the matrix to form a mold.
30. The method as claimed in claim 29 further comprising the step of using the mold in a molding process.
31. The method as claimed in claim 28 wherein the shell is at least 0.1 inches thick.
32. The method as claimed in claim 31 wherein the shell is 0.25 inches thick.
33. The method as claimed in claim 28 wherein the shell has an exterior surface area of at least one square meter.
34. The method as claimed in claim 22 wherein the filaments of said sheet are spaced apart from one another and define gaps therebetween.
35. The method as claimed in claim 34 wherein said step of placing a sheet includes the step of separating the filaments of the sheet from one another to form or enlarge the gaps.
36. The method as claimed in claim 22 wherein said step of providing said underlying metal layer includes spray depositing said underlying metal layer by making a plurality of passes with at least one spray gun.
37. The method as claimed in claim 22 wherein the spray gun is an arc spray gun.
38. The method as claimed in claim 22 wherein the spray gun is a plasma spray gun.
39. The method as claimed in claim 22 wherein the metal layers are constructed from the group consisting of iron, nickel, zinc, aluminum, and copper.
40. The method as claimed in claim 22 wherein the metal layer is constructed from approximately 30-42% nickel.
41. The method as claimed in claim 22 wherein the sheet is a carbon woven fabric.
42. The method as claimed in claim 28 further comprising the step of sealing the shell by impregnating the shell.
43. The method as claimed in claim 42 wherein said step of impregnating the shell includes the step of impregnating the shell with a polymeric material.
44. The method as claimed in claim 42 wherein said step of impregnating the shell includes the step of plating a metal onto the shell.
45. The method as claimed in claim 22 further comprising the step of forming a composite part in said mold.