19 Oct
2018
19 Oct
'18
10:39 a.m.
On Oct 19, 2018, at 1:14 PM, Al Kossow via cctalk
<cctalk at classiccmp.org> wrote:
That's basically Ethernet except very slow (2 Mb/s, even slower than
"Experimental Ethernet"). But it's described as CSMA/CD, and it uses the
much-cursed Intel 82586 Ethernet chip.
Token ring ended up a failure because it was slow and completely incompatible with other
802 networks, from the backward addresses to the bizarre pseudo-multicast scheme to the
source routing bridges. In spite of IBM marketing claims, 802.5 data link layer is not a
well behaved design. Later token rings, like FDDI, used the 802.4 token passing algorithm
("Timed token"), avoiding the 802.5 algorithms completely.
paul
> IBM developed a Token Ring card for the PC in
time for its launch
IBM's initial networking for the PC (The PC Network) was broadband, based
on technology from Sytek. 4Mb token ring was released later. Exact dates
are in the manuals on bitsavers.
http://bitsavers.org/pdf/ibm/pc/pc_network/6322916_PC_Network_Technical_Ref…