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Home > Archive > CCNA > August 2004 > OSI Layer
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| cybertechno 2004-08-20, 5:13 am |
| The physical and data link layers are usually implemented in hardware and software. The remaining layers are usually implemented in the software.
Interpreting the above statement:
Physical layer's functionality is implemented in hardware and software!
IS THIS STATEMENT TRUE?!!!Can functionality of physical layer be implemented in software?
Thanx | |
| smrkdown 2004-08-20, 6:03 am |
| It's just a conceptual model, and the concept of the physical layer is just that... physical. Bits, connectors, etc. I don't believe much any of this is implemented in software. | |
| sandy7000 2004-08-20, 3:06 pm |
| If you have a router or such, you have firmware, which is "software" of sorts.
Also, XP works power managment out of the os instead of the BIOS now (which is a weak argument).
I'm not the final word, though, over Smrkdown or the others. | |
| smrkdown 2004-08-20, 3:15 pm |
| "The Physical Layer defines the electrical and mechanical aspects of interfacing to a physical medium for transmitting data, as well as setup, maintenance, and disconnection of physical links. This layer includes the software driver for each communications device, plus the hardware itself—interface devices, modems, and communications lines."
"In the Open Systems Interconnection (OSI) communications model, the physical layer supports the electrical or mechanical interface to the physical medium. For example, this layer determines how to put a stream of bits from the upper (data link) layer on to the pins for a parallel printer interface, an optical fiber transmitter, or a radio carrier.
The physical layer is usually a combination of software and hardware programming and may include electromechanical devices. It does not include the physical media as such."
I'm supposing now that it manifests itself in hardware and software. Interesting. | |
| cybertechno 2004-08-21, 7:55 am |
| Thanx for that! |
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