is Ethernet interface considered to be Parallel interface ?

[mohammed hashim]

hi all

if ethernet is not a serial int, then is it Parallel interface ??

thanks,

[Joseph W. Doherty]

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Posting

No, it's serial, because it only has one transmission wire.  [edit] BTW, this applies to Ethernet and FastEthernet, GigEthernet uses two transmission wires.

Parallel uses multiple transmission wires.

[mohammed hashim]

thank you for your reply,

ok, is there parallel interfaces give a high data transmission rate like 10GB, 40GB or more ?

thanks,

[Joseph W. Doherty]

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Posting

Internally, many bus type interfaces, e.g. PCI (and it's later variants) and 10g backplane Ethernet, 10GBASE-KX4, use parallel "lanes".

Externally, CX-4 copper, at 10g, uses four paths.  10GBASE-T uses two paths.

BTW, a "true" parallel interface, as I understand it, implies a synchronized parallel transmission of bits.  When serial hits bandwidth limits, that cannot easily be improved by modulation techniques, serial paths are bonded in parallel.  For example, in the above, CX-4 transmits 2.5 Gbps in each of its 4 paths.

[mohammed hashim]

today I was reading in Cisco Lan Switching book,

about bit transmission, there are two ways, like either start with MSB then LSB (token Ring), or LSB then MSB (Ethernet),

so if we talk about parallel communication, how LSB and MSB are treated,

LSB = Lowest Significant bit

MSB = Most Significant bit

thanks,

[Joseph W. Doherty]

Disclaimer

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In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

They're not, as parallel transmits them side-by-side, not serial.  Of course, it's up to the particular parallel standard where the LSB or MSB is on the parallel pins.