| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 358.1 | Q-Bus FDDI adapter is currently under development in DEC | QUIVER::WASHABAUGH | Born to be Mild | Wed Aug 26 1992 22:14 | 1 |
| doug
|
| 358.2 | Within six months | BONNET::LISSDANIELS | | Thu Aug 27 1992 07:00 | 5 |
| Q-bus FDDI is planned to be available within six months.
Only for MicroVAX 3000/4000 with VMS.
Software support will gate final FCS date.
|
| 358.3 | Q-bus performance ? | LARVAE::HARVEY | Baldly going into the unknown... | Thu Aug 27 1992 11:39 | 7 |
| Presumably this adapter is for "connectivity" as against "peformance" ?!
Q-bus is only @25 Mbps isn't it ?
What a shame for these mega-4000 systems !!
Rog
|
| 358.4 | Three times Ethernet ! | BONNET::LISSDANIELS | | Thu Aug 27 1992 11:58 | 13 |
|
Well, why always see the limitation ?
It is probably THREE times what you have today with Ethernet !
As there is not very much else on the Q-bus today it should do OK.
Remember FDDI is a SHARED media until we get the GIGAswitch.
But I do agree in one sense - Q-bus as the only real I/O bus
on the new fast VAX 4000's are not really the future bus. Get it ? ;-)
Torbjorn
|
| 358.5 | Making folks aware | LARVAE::HARVEY | Baldly going into the unknown... | Thu Aug 27 1992 12:31 | 13 |
| Sorry Torbjorn if I came over a little negative - I'm not really.
I just wanted to raise the point that Q-bus ain't quick - just in case
folks get carried away with the idea of the new VAX 4000s and 100 Mbps
networking speeds.
I'm aware of one or two folks who've looked at the 4000s for use in FDDI
clusters. Not impossible - just limited !
Hopefully, like the PC card, the Q-bus adapter with have sufficient
memory on board to enable buffering to occur to aid the performance a tad.
Rog
|
| 358.6 | Qbus Adapter | QUIVER::WASHABAUGH | Born to be Mild | Thu Aug 27 1992 19:55 | 8 |
| Yes, the adapter has ample buffering - 1 meg of on board packet memory. Also
the new gate array has a memory controller which utilizes the packet memory
very efficiently. Generally, the architecture of the adapter is more efficient
than some previous adapters so there will be more CPU left for applications (the
transmit and receive DMA engines help here) at the same network utlization
level.
doug
|
| 358.7 | Protocol? | VOX::MORRIS | Tom Morris - IVV Voice Engineering | Thu Sep 17 1992 19:29 | 3 |
| What protocol stack(s) will be supported on VMS for this device?
Tom
|
| 358.8 | | KONING::KONING | Paul Koning, A-13683 | Fri Sep 18 1992 12:19 | 4 |
| I would assume: the same as for every other FDDI and Ethernet device. A LAN is
a LAN, after all (unless it's an 802.5 token ring).
paul
|
| 358.9 | And OpenVMS is OpenVMS is... | CGOS01::DMARLOWE | PDP 11: MOV -(PC),-(PC) | Fri Sep 18 1992 12:33 | 4 |
| All that should change is the adapter at the data link layer. The
upper layers shouldn't see any thing different.
dmm
|