Data Transmission Standards.

for devices to be able to communicate, there are requirements (parameters) for:
- signal,
- transmission means between devices.

these parameters are described in so called 'Network Standards'.

Network Standards include:

1. IEEE 802.3 - Ethernet.
- wired,
- for devices communication,
- there are versions, for example: IEEE 802.3a.

2. IEEE 802.11 - Generic Radio Wireless Transmission Standard.
- wireless,
- for devices communication in the Radio frequency bands,
- there are versions, for example: IEEE 802.11a.

There are multi-channel-joining solutions, but not all devices are ready for such.

Different versions of IEEE 802.11 offer different service parameters:
- data transfer speed,
- signal transmission frequency,
- range,
- perhaps more.

IEEE 802.11.
- used frequencies: 2.4-2.5 GHz & 5 GHz,
- transfer speed: 2 Mb/s.

IEEE 802.11a.
- used frequencies: 5 GHz,
- transfer speed: up to 54 Mbps,
- greater range, depending on speed (higher speed, closer range).

IEEE 802.11b.
- used frequencies: 2.4 GHz,
- transfer speed: up to 11 Mbps,
- less of packets lost than in previous standards versions,

IEEE 802.11g.
- backward compatible successor of IEEE 802.11b, devices using 802.11b & 802.11g can communicate without hindrance,
- used frequencies: 2.4 GHz,
- transfer speed: up to 54 Mbps (if all of devices communicate using IEEE 802.11g, or 11 Mbps otherwise),

IEEE 802.11n.
- transfer speeds: up to 300 Mbps (over 100 Mbps is useful),
- uses multiple channels, multiple different frequencies over a frequency band,
- data loss because of checksums, addresses, etc... to verify data 'truthfulness'.

Source: [43], IEEE 802.11 on Wikipedia, IEEE 802.3 on Wikipedia.

No comments:

Post a Comment