| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1584.1 | Remember the FDDI dance. | CGOS01::DMARLOWE | Have you been HUBbed lately? | Mon Oct 17 1994 17:34 | 4 |
| Yes it will work. I have used the DS 900EF for connections into
and outside of the hub.
dave
|
| 1584.2 | carefull | NETCAD::ARGO | | Tue Oct 18 1994 13:11 | 56 |
| >I'm trying to avoid the need for a DECcon in the initial config
>since customer views it as a future requirement. Today they
>want DECswitch900EF (to switch amoung shared lans and FDDI) and
>a PEswitch900TX for high perf connections. Is this configuration
>OKay until they add a DECcon:
>
>
>FrontPanel HUB-1 HUB-2
> .------------------------------.
> | |
> +---------+ +--A------+ +--B------+ +---------+
> | PE900TX | | DS900EF | | DS900EF | | PE900TX |
> +--A---B--+ +------B--+ +------A--+ +--A---B--+
> | | | |
> `---------------' `-----------'
>
>Backplane
>
>I know this is a wrapped ring, but will it operate and would there be
>any hidden issues preventing it from working. Other suggestions?
Yes this will work.
>Next year, when treed backplane support arrives and customer buys
>DC900MX, config would grow to look like:
>
>
>FrontPanel HUB-1 HUB-2
> .---------------------.
> | .---------. |
> | | | |
>+---------+ +---------+ +-A-----B-+ +-A-----B-+ +---------+ +---------+
>| PE900TX | | DS900EF | | DC900MX | | DC900MX | | DS900EF | | PE900TX |
>+-S-------+ +--S------+ +-M----M--+ +--M----M-+ +-------S-+ +-------S-+
> | | | | | | | |
> | +----------+ | | +-----------+ |
> +----------------------------+ +----------------------------+
>
>
>Backplane
A word of caution. We are still working on how to implement trees
on the backplane. So, don't assume a particular backplane
configuration. For example, there will not be a device that
supports 2 M ports on the backplane. Karl Pieper and friends
are currently writing up a note that describes trees and how
they will be implemented on the backplane. Wait (about 3-4 weeks)
for his entry to get the gory details.
What's the concentrator for? Are there FDDI stations (SAS or DAS) not
shown in your picture that will be attaching to the M ports of the
concentator?
Dennis
|
| 1584.3 | We will proceed with caution :-) | JAYJAY::KORNS | | Fri Oct 21 1994 18:36 | 9 |
| RE: .1 & .2: Thanks.
RE: .2: Thanks for warning. I think I see Karl's new note and I am
pulling to print right now.
The idea is that sometime next year they will upgrade some servers
to FDDI and actually plug them into DC900MX front panel ports. Yeah,
I need to re-look at the config rules and how this would all be config'ed
given feature/functions in the microcode.
|
| 1584.4 | A better way... | NETCAD::SLAWRENCE | | Mon Oct 24 1994 17:17 | 26 |
|
As the others said, the current config will work.
When your customer wants to upgrade, it should be to:
FrontPanel HUB-1 HUB-2
+-------------------------------------------------------------------+
| +-------+ |
| | | |
+-A-------+ +---------+ +-------B-+ +-A-------+ +---------+ +-------B-+
| DC900MX | | PE900TX | | DS900EF | | DS900EF | | PE900TX | | DC900MX |
+-------B-+ +-A-----B-+ +-A-------+ +-------B-+ +-A-----B-+ +-A-------+
| | | | | | | |
+-----+ +-----+ +-----+ +-----+
This has the following advantages over what you drew:
o Don't have to wait for treeing; you don't need it.
o Each hub is connected to the other via two modules;
fewer components that can fail and partition the ring.
o By putting one of the hub-hub connections on the bridge,
you get one more front panel M port available on each
concentrator.
|