| Title: | DEChub/HUBwatch/PROBEwatch CONFERENCE |
| Notice: | Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7 |
| Moderator: | NETCAD::COLELLA DT |
| Created: | Wed Nov 13 1991 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 4455 |
| Total number of notes: | 16761 |
Hi,
Can I have this configuration:
ONE concentrator 900TH with 2 Multi-mode fiber and
7 PEswitch 900TX in one hub900,and will add up to ten DEChub900
in a chain? This will provide 400 Information points in one big
building.
Thanks,
Tyrone
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 2649.3 | 1 out of 2 | DELNI::BUZZELL | Fri Aug 18 1995 12:33 | 10 | |
RE. -1 You can build the cinfiguration with 2 concentrators and
it will work. With 2TH's you draw 419 watts, and with 2MX's it draws
403 watts. It will NOT work with a DECswitch 900EF and either
concentrator because 428-436 watts are needed. And yes I am aware
that with new supplies eventually we will be able to get 489 watts
but it aint shipping yet.
| |||||
| 2649.4 | Thanks Ed | NETCAD::DOODY | Michael Doody | Fri Aug 18 1995 13:25 | 1 |
| 2649.5 | Sorry Tyrone | NETCAD::DOODY | Michael Doody | Mon Aug 21 1995 10:41 | 57 |
The configuration in 2649.0 will work. I have deleted my replies
in .1 and .2 in hopes of preventing confusion.
With the latest firmware, a new Ligo has been defined to allow
a concentrator to be the root of a tree. Using this capability,
you can connect your 10 hubs together using a dual ring, however
you will not have a dual ring within the hubs since the modules
will be tree'd off the concentrator. Here is a snippet of
the FDDI configuration guide which can be found in note #2340.
-Mike
EXAMPLE 4: DUAL HOMING AND CONNECTION TO AN EXTERNAL DUAL RING
In some cases it is desirable to connect the hub to an external dual ring,
and tree the modules within the backplane. In other cases, it is desirable
to have a redundant connection from the hub to higher level concentrators.
This second case is commonly referred to as dual homing. Either of these
configurations requires the use of a concentrator at the top of the tree.
Note, the modules connected via the hub backplane are single attach
modules; the dual homing pertains to the connection between the hub based
tree and the external concentrator.
Diagram #15: Dual Homed Connections to an FDDI Network
Front Panel Ports
A B
| M M M M |
| | | | | |
+-------------+ +-------------+ +-+-+-+-+-+-+-+
|Switch | |Switch | |Concentrator |
+-+---------+-+ +-+---------+-+ +-+-----------+
| | | | |
| +-------------+ +-------------+
M S M S M
Backplane Ports
Diagram #16: Building Block Representation of Diagram #15 Configuration
A B
| |
+-------+ +-------+ +-+-----+-+
|Nonroot| |Nonroot| | Root |
| MS | | MS | | Primary |
+-+---+-+ +-+---+-+ +-+-------+
| | | | |
M S M S M
| |||||
| 2649.6 | Any backplane limitation ?... | LFOIS1::MOUSSU | so unusuaL terM | Tue Aug 22 1995 06:44 | 6 |
I guess that such a way, in each DEChub 900MS, there will be 7 PEswitches each one treed to the DECconcentrator. That will need a total amount of 14 flexible channels. Is that currently supported ? | |||||
| 2649.7 | NETCAD::DOODY | Michael Doody | Tue Aug 22 1995 10:35 | 5 | |
Yes, that will use up all the lower connector flex channels. There is
still the upper connector flex channel and the ThinWire channel
available for two ethernet segments.
-Mike
| |||||