4 Oct
2018
4 Oct
'18
10:26 a.m.
On Oct 4, 2018, at 1:07 PM, Eric Smith via cctalk
<cctalk at classiccmp.org> wrote:
On Tue, Oct 2, 2018 at 10:55 PM Grant Taylor via cctalk <
cctalk at classiccmp.org> wrote:
That's sort of accurate. A quick look shows some key differences: V2 adds the
"collision presence test" -- verifying the collision detect signal is working.
There is also the "jabber timer" -- a watchdog timeout that stops excessively
long frames. And V2 introduces the loopback protocol (protocol type 90-00).
The collision presence test is somewhat of an interoperability issue: if you attach a V1
transceiver to a V2 NIC, the NIC would complain on every transmit that it didn't get
the collision test signal.
paul
On 10/02/2018 05:27 PM, Eric Smith via cctalk
wrote:
The Ethernet I and II standards are available from Bitsavers:
http://bitsavers.trailing-edge.com/pdf/xerox/ethernet/
From the preface of _The Ethernet_ Version 2.0:
Version 2.0 of the Ethernet specification reflects the experience of the
three corporations in designing equipment to the Version 1.0 specification.
Version 2.0 includes network management functions and better defines the
details of the physical channel signalling. Version 2.0 is upward
compatible with Version 1.0. Equipment designed to the two specifications
is interoperable. 3 Mbps Ethernet is _NOT_ Ethernet I. Both
Ethernet I and II were 10 Mbps
DIX standards, with II having only minor differences from I.
Okay. Thank you for the correction ~> clarification.
Now I'll keep an eye out (but not quite search for) the differences
between Ethernet (I) and Ethernet II