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Conference noted::atm

Title:	atm

Moderator:	NPSS::WATERS

Created:	Mon Oct 05 1992
Last Modified:	Thu Jun 05 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	970
Total number of notes:	3630

917.0. "are DAGGL-AA and DAGGL-BA supported on Baby GIGAS?" by MXOV06::EPELAEZ () Tue Apr 22 1997 18:15

    Hello,
    
    Does anyone could explain me what is the reason because on the
    Installation and Service Manual from Gigaswitch/ATM 5-Slot system 
    there is a note which stablish that:
    "DAGGL-AA and DAGGL-AB are not supported for the use in the
     GIGAswitch/ATM 5-slot system"
    
    We have a customer who asked us and we have not find any document
    regarding this issue.
    
    I would appreciate any comments.
    
    Thanks in advance and best regards
    
    Enrique

T.R Title User Personal
Name Date Lines

917.1 different power requirements NOTED::defctb.hpn.lkg.dec.com::melaragni Bill, [email protected] Wed Apr 23 1997 08:47 21

T.R	Title	User	Personal Name	Date	Lines
917.1	different power requirements	NOTED::defctb.hpn.lkg.dec.com::melaragni	Bill, [email protected]	`Wed Apr 23 1997 08:47`	21
	The most important reason for this is that the power distribution mechanisms for 5-slot and 14-slot box are different. The 5-slot box distributes 5v to all of the linecards while the 14-slot box distributes 48v. A card that is not designed to operate from +5v directly will not operate in the 5-slot GS/ATM box. Cards that are designed to work in both systems have a DC/DC converter (sometimes called a "power brick") that is socketted. When installed in a 5-slot box, a special "converter" is put into the linecard that allows it to draw +5v from the system. When installed in the 14-slot box, a 48v-to-5v converter takes the 48v and turns it into +5v for the line card. Also, along the same lines, I believe that the +5v and 48v inputs are on different connectors on the linecard. Older modules, like the DAGGL-AA, don't have the needed +5v connector and cannot draw power from the 5-slot box. Hope this helps, bill

The most important reason for this is that the power distribution
mechanisms for 5-slot and 14-slot box are different. The 5-slot
box distributes 5v to all of the linecards while the 14-slot box
distributes 48v. A card that is not designed to operate from +5v 
directly will not operate in the 5-slot GS/ATM box.

Cards that are designed to work in both systems have a DC/DC 
converter (sometimes called a "power brick") that is socketted. When
installed in a 5-slot box, a special "converter" is put into the linecard
that allows it to draw +5v from the system. When installed in the 14-slot
box, a 48v-to-5v converter takes the 48v and turns it into +5v for the line
card.

Also, along the same lines, I believe that the +5v and 48v inputs are
on different connectors on the linecard. Older modules, like the DAGGL-AA,
don't have the needed +5v connector and cannot draw power from the 5-slot
box.

Hope this helps,

bill