Archived from groups: comp.dcom.lans.ethernet (
More info?)
In article <1098999718.546624@entelocal.ipberlin.com>,
jpd <read_the_sig@do.not.spam.it> wrote:
> On 2004-10-28, T. Sean Weintz <strap@hanh-ct.org> wrote:
> > Michael Roberts wrote:
> >> Layer 2 - MAC Address, 48 bit unique identifier for a network host
> >> participating in an network. MAC address does not imply the network is
> >> Ethernet.
> ><snip>
> >
> > Not always 48 bit. Can be more, can be less.
>
> 802.3 says that 802 defines 16 and 48 bits MAC addresses. (I can't seem
> to find the 16-bit definition in 802-2001?) 802.3 specifically excludes
> 16-bit MAC addresses. In that sense only 48-bit macs are conformant.
>
Only 48 bit addresses conform to the Ethernet/IEEE 802.3 standard,
however, that is not the only MAC in the world. As other posters noted,
ARCnet used 8 bit MAC addresses as did Apple's LocalTalk (although they
didn't call them "MAC" addresses).
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