L10 Flashcards
True or False:
Channels for the 802.11b DS physical layer are much smaller than the channels for the FH physical layer
False
They are larger
What led to the acceptance of 802.11b?
802.11b had increase in throughput and reduced price
What does the typical usage of 802.11b include?
Point to multipoint configuration
What is a WPAN? What IEEE protocol supports it?
Wireless Personal Area Networks (WPANs): introduce personal operating space (POS)
IEEE 802.15.1 was developed to support WPANS
What are the differences between WPAN and WLAN?
WPAN exhibit more power consumption than WLAN
Coverage for WPAN is much smaller than WLAN
The lifespan of WPAN is specified unlike WLAN
What are piconets? How are they related to scatternets?
A piconet is composed of a master device and at least one slave device. Slave devices can only have point-to-point communication with the Master. A device can be a slave node in multiple piconets but can be a master node in only one.
Interconnected piconets lead to scatternets
Why would a master and slave want to switch roles in a piconet?
When the slave wants to join a piconet as a master
When is a WPAN “born”?
When a device requests to transmit some information to another device
What are the two primary types of communication channels in WPANs?
Synchronous connection-oriented channel for time sensitive data (such as audio)
Asynchronous connectionless channel for data communication (such as file transfer)
How is interference minimized in WPANs?
Fast Frequency Hopping (FFH)
- cannot be eliminated, only minimised
How is master-slave communication done in 802.15.1?
through time division duplex scheme
What does a IEEE 802.15.1 packet consist of?
Access code
Header
Payload
How is each active slave identified in IEEE 802.15.1?
active member address (AM_ADDR)
What are the three access codes in the IEEE 802.15.1 standard?
channel address code (CAC)
device access code (DAC)
inquiry address code (IAC)
Describe bluetooth packets (the split).
three packet sizes consisting of one slot, three slots, and five slots, respectively
