Bluetooth-Specifications-281

ghdhair100 · Wysłany: Pon 8:05, 14 Mar 2011 Temat postu: Bluetooth-Specifications-281

Bluetooth Specifications
Below, you'll find several specifications for the
well known Bluetooth:
1. Throughout the United States and even Europe,
the range of frequency is 2,400 - 2,483.5 MHZ, with
79 1-MHz RF (radio frequency) channels. The
frequency range in Japan is 2,472 to 2,497 MHz with
23 1-MHz RF channels.
2. A data channel of Bluetooth randomly hops 1,600
times per second between the 79 RF channels.
3. Each Bluetooth channel is divided into time
slots,[link widoczny dla zalogowanych], with each one being 625 microseconds long.
4. A Bluetooth piconet has one master and up to
seven slaves. The master will transmit in even
time slots,[link widoczny dla zalogowanych], while the slaves will transmit in odd
time slots.
5. The data in a single packet can be up to 2,745
bits in length.
6. Currently, there are two types of data transfer
between devices - SCO (synchronous connection
oriented) and ACL (asynchronous connectionless).
7. In a Bluetooth piconet, there can be up to
three SCO links containing 64,000 bits per second
with each one. To help avoid collision and timing
problems, the links of the SCO will use reserved
slots set up by the master.
8. A master can support up to three SCO links
with either one,[link widoczny dla zalogowanych], two, or even three slaves.
9. The slots not reserved for the SCO links can
be used for ACL links.
10. A single master and slave can have one ACL
link.
11. ACL is either master to one slave (point to
point) or it broadcasts to all of the slaves.
12. The ACL slaves will only transmit when it has
been requested by the master. If the master doesn't
make the request, the ACL slaves won't transmit
anything at all.
(word count 281)
PPPPP
The Court of Appeal pointed out that R and F's submission in the county court was of overt, conscious racism, and it was not prepared to find that there had been unconscious discrimination.The decisionThe Court of Appeal said that, unlike the ordinary civil claim where the judge decides, on the claimant's evidence only, whether the claimant has made out a case, in this case the judge had had the benefit of the whole of the evidence. Despite the school's failure to comply with the statutory requirements, the judge had been entitled to find on the basis of all the evidence that R and F had not proved racial discrimination.

[link widoczny dla zalogowanych]