1. An electronic apparatus comprising a first attachment portion which is provided in an apparatus body and to which a first component can be attached, and a second attachment portion which is provided in the apparatus body at a position different from the first attachment portion and has a substantially same structure as the first attachment portion, and to which a second component can be attached.
2. An electronic apparatus according to claim 1, wherein the first attachment portion has a first connector for electrically connecting the first component to the apparatus body and a first mechanical connection means for mechanically connecting the first component to the apparatus body, and the second attachment portion has a second connector for electrically connecting the second component to the apparatus body and a second mechanical connection means for mechanically connecting the second component to the apparatus body, the relationship between the first connector and the first mechanical connection means being substantially the same as the relationship between the second connector and the second mechanical connection means.
3. An electronic apparatus according to claim 1, wherein the first component has a generally same appearance and shape as the second component.
4. An electronic apparatus according to claim 1, wherein at least one of the first component and the second component is a battery pack.
5. An electronic apparatus according to claim 1, wherein both the first component and the second component are battery packs.
6. An electronic apparatus according to claim 1, wherein at least one of the first component and the second component is a connector box to which an additional component can be attached.
7. An electronic apparatus according to claim 1, wherein the first attachment portion is located at the front of the apparatus body and the second attachment portion is located at the rear of the apparatus body, and wherein the first and the second components can be detachably attached to the apparatus body from outside the apparatus body.
8. An electronic apparatus according to claim 7, wherein the first component and the second component extend long along the front and the rear, respectively, of the apparatus body.
9. An electronic apparatus according to claim 8, wherein the first component and the second component have length not less than half the length of the front or the rear of the apparatus body.
10. An electronic apparatus according to claim 1, wherein the information processing apparatus is a notebook type information processing apparatus having a part including a keyboard and another part including a display and pivotally attached to the part including the keyboard.
11. An electronic apparatus according to claim 10, wherein the first attachment portion and the second attachment portion are provided at the front and the rear of the part including the keyboard.
12. An electronic apparatus according to claim 10, wherein the first component and the second component have engaging means, and the part including the display has locking means capable of being engaged with the engaging means of one of the first component and the second component attached to the front of the part including the keyboard when the part including the display is closed onto the part including the keyboard.
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.-21. (canceled)
22. A method for determining an optimal data transfer rate via a transfer medium, comprising:
a.) providing a plurality of sequences having different data transfer rates;
b.) distributing the sequences amongst a plurality of chronologically sequential stages such that the sequences assigned to each stage have a pre-determinable interval in respect to the data transfer rate;
c.) transferring at least of a portion of the sequences assigned to a stage and selecting an interval arranged between two transferred sequences as a function of a transmission quality; and
d.) transferring at least a part of the sequences lying in the selected interval and assigned to a subsequent stage.
23. The method as claimed in claim 22, wherein steps c and d are repeated.
24. The method as claimed in claim 22, wherein the sequences are transferred at least partly with different data transmission methods.
25. The method as claimed in claim 24, wherein the sequences are created at least partly with different modulation methods or transferred with different transmit powers.
26. The method as claimed in one of the claim 22, wherein steps c and d are repeated in a cycle until a pre-determinable maximum number of sequences have been transferred.
27. The method as claimed in one of the claim 22, wherein steps c and d are repeated in a cycle for a specified number of stages.
28. The method as claimed in one of the claim 22, wherein a number of the stages is determined such that the last stage two adjacent sequences are as close to each other as possible in respect of their data transfer rate, the method further comprising determining an optimal transmission rate being by interpolation of the selected adjacent sequences.
29. The method as claimed in one of the claim 22, wherein a number of the stages is determined such that the interval between two adjacent sequences in the last stage has the value one in respect of the data transfer rate.
30. The method as claimed in one of the claim 22, wherein the interval between the sequences assigned to a stage becomes smaller in the chronologically subsequent stage in respect of the data transfer rate.
31. The method as claimed in one of the claim 22, wherein the intervals between two sequences adjacent to each other and assigned to the same stage have approximately the same value.
32. The method as claimed in one of the claim 22, wherein the transfer medium is embodied as a wireless transfer medium or as a wired transfer medium or as an optical transfer medium.
33. The method as claimed in one of the claim 22, wherein the transmission quality is recorded with at least one indicia of a received sequence, the indicia selected from the group consisting of amplitude, bit error rate, and signal-to-noise ratio.
34. The method as claimed in one of the claim 22, wherein the optimal data transfer rate is determined within the framework of an xDSL transmission method.
35. A communication device for determining the highest possible data transfer rate via a transmission medium able to be connected to said device, comprising:
a transmission unit transferring a plurality of sequences having different data transfer rates via the transfer medium;
a recording unit for recording information representing a transmission quality as a function of the transferred sequences; and
an assignment unit assigning the sequences to a number of chronologically sequential stages with the sequences assigned to one stage having a pre-determinable interval in respect of the data transfer rate,
wherein the transfer unit and the recording unit embodied such that:
a.) at least a portion of the sequences assigned to a stage are transferred
b.) an interval arranged between two transferred sequences is selected as a function of the transmission quality determined, and
c.) at least a portion of the sequences in the selected interval and assigned to a subsequent stage are transferred.
36. The communication device as claimed in claim 35, wherein the transfer unit and the recording unit embodied to repeat a, b and c.
37. The communication device as claimed in claim 36, wherein a, b and c are repeated until a maximum number of sequences are transferred.
38. The communication device as claimed in claim 36, wherein a, b and c are repeated until a specified number of stages are transferred.
39. The communication device as claimed in claim 36, wherein the transfer unit, the assignment unit and the recording unit are embodied such that:
a number of stages is determined such that in the last stage, two adjacent sequences have the smallest possible interval in respect of the data transfer rate, and an optimal transmission rate is determined by interpolation of the selected adjacent sequences
40. The communication device as claimed in claim 39, wherein the transfer unit, the assignment unit and the recording unit are embodied such a number of stages is selected such that in the last stage the interval between two adjacent sequences has the value of one in respect of the data transfer rate.
41. The communication device as claimed in claim 40, wherein the communication device is embodied as decentralized communication device assigned to the subscriber-side or is arranged as a central switching device.
42. A communication arrangement for determining an optimal data transfer rate via a transfer medium, comprising:
a transfer unit for transferring a plurality of sequences having different data transmission rates via the transfer medium
a recording unit for recording the transmission quality as a function of the transferred sequences; and
an assignment unit by which the sequences to be transferred are assigned to a number of chronologically sequential stages, with sequences assigned to a same stage, have a pre-determinable interval in respect of the data transfer rate, and
the transfer unit and the recording unit embodied such that:
a) at least a part of the sequences assigned to a stage are transferred and an interval arranged between two transferred sequences is selected as a function of the transmission quality determined, and
b) at least a part of the sequences lying in the selected interval and assigned to the subsequent stage are transferred.