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Conference netcad::hub_mgnt

Title:	DEChub/HUBwatch/PROBEwatch CONFERENCE
Notice:	Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7
Moderator:	NETCAD::COLELLADT

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

1729.0. "< tree connection,external or internal ? >" by LEMAN::GAILLARDON () Tue Nov 29 1994 03:01

What I'm trying to do is the following (star topology)

From a central site, I need to connect 8 remote sites with Single Mode Fiber.
Therefore I need 4 conc900MX with 2 PMD-DEFXS SMFports(M) in each. The ring is 
created within the backplane, A from the first concentrator and B from the 
switch used for the external connection on the existing ring.
On the remote site, I need to use one conc900MX with one SMF PMD, the only way 
to dispose of a SMF port as the Switch900EF CANNOT receive an SMF PMD. 

      -------------connect to external ring---------			
      ^						    ^
      |4x CONC 900MX		Switch 900EF	    | ring FDDI, MMF
      |	+-----------+		+--------------+    |
      +-|A M   M   B|-----------|A  ------   B |----+ 
	+--|---|----+		+--------------+        CENTRAL SITE
	   |   |only 2 SMF PMD per CONC900MX 	
	   |   |therefore 4 900MX + 1 switch 900EF in a HUB900
	   |   |
......... .|...|..............................................................
	   |   |		 DMHUB			REMOTE SITES (8)
	   |   |              **********************
	   |   | 10 Km SMF    *	+--------------+   *
	   |   +----------------|A  M M M M  B | CONC 900MX
	   |SMF		      *	+---|----------+   *	port A is SMF PMD  
 	   +---- idem 7 times *	    |              *	port B & M are MMF
			      *   +-|----------+   *
			      *	  | A ------ B | Switch900EF
			      *	  +------------+   *
			      **********************			 

Then the question: is the M to A  backplane connection allowed or is the
external connection mandatory..?
 
Thanks for your help
Robert

T.R	Title	User	Personal Name	Date	Lines
1729.1	How to do.	CGOS01::DMARLOWE	Have you been HUBbed lately?	`Tue Nov 29 1994 12:59`	25
	>Then the question: is the M to A backplane connection allowed or is the >external connection mandatory..? No and not necessarily. I've redrawn below. M ports will not be supported until Wave 3, Mar/Apr 95. You would configure, in the 900MX, A to the front panel and B to the backplane. The 2 modules would then connect to a created FDDI channel. dave ...........\|...\|.............................................................. \| \| DMHUB REMOTE SITES (8) \| \| ********************** \| \| 10 Km SMF * +--------------+ * \| +----------------\|A M M M M B \| CONC 900MX \|SMF * +------------\|-+ * port A is SMF PMD +---- iden 7 times * \| * port B & M are MMF * +--------+ * * +-\|----------+ * * \| A ------ B \| Switch900EF * +------------+ * **********************
1729.2	thanks	LEMAN::GAILLARDON		`Wed Nov 30 1994 02:38`	2
	Dave, Thanks a lot
1729.3		NETCAD::SLAWRENCE		`Wed Nov 30 1994 14:28`	36
	In Wave 3 it will be possible to configure this as: -------------connect to external ring--------- ^ ^ \|4x CONC 900MX Switch 900EF \| ring FDDI, MMF \| +-----------+ +--------------+ \| +-\|A M M B\|-----------\|A ------ B \|----+ +--\|---\|----+ +--------------+ CENTRAL SITE \| \|only 2 SMF PMD per CONC900MX \| \|therefore 4 900MX + 1 switch 900EF in a HUB900 \| \| ......... .\|...\|.............................................................. \| \| DMHUB REMOTE SITES (8) \| \| ********************** \| \| 10 Km SMF * +--------------+ * \| +----------------\|A M M M M B \| CONC 900MX \|SMF * +---\|----------+ * port A is SMF PMD +---- idem 7 times * \| * port B & M are MMF * +-\|----------+ * * \| S ------ \| Switch900EF * +------------+ * ********************** Note that the backplane connection is M-S, not M-A. For now, you can build your original configuration with external cables. The configuration in .1 won't work because there is a peer violation: main ring M - A/B - A The module in the middle would drop the B - A connection (peer) in favor of the M - A (tree).
1729.4	What firmware additions/changes?	CGOS01::DMARLOWE	Have you been HUBbed lately?	`Wed Nov 30 1994 17:59`	4
	So does this mean that the Wave 3 firmware will allow the A B ports of the DS 900EF to be reconfigured as S ports? dave
1729.5		NETCAD::B_CRONIN		`Thu Dec 01 1994 17:23`	5
	It means that the A will be an S, and the B an M, when both are directed into the backplane. We'll outline the whole story in another config memo in the future.