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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

2283.0. "DEChub 90 modules and +5Vdc" by DPDMAI::DAVIES (Mark, SCA Area Network Consultant) Tue May 16 1995 13:53

    My customer (a telco type) needs a bunch of 5 port thinwire repeaters. 
    He also WANTS them to be able to accept DC power, so they do not have
    to provide an DC->AC converter.
    
    We want to bid them the 6-port DECrepeater 90C.  On the back of the
    module there appears to be a mini-din connector for the standalone
    power supply to connet to.  Inscribed beside this is the following
    info:
    
    	5.1Vdc, 8.1A, 9W
    
    The customer wants to know if he can provide + 5Vdc directly into the
    back of this unit and have it work, and be supported.
    
    If yes, what type of connector should I tell him he needs to supply,
    ie, is it a mini-din?
    
    Thanks,
    
    Mark

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2283.1 NETCAD::HERTZBERG History: Love it or Leave it! Tue May 16 1995 14:28 36

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2283.1		NETCAD::HERTZBERG	History: Love it or Leave it!	`Tue May 16 1995 14:28`	36
	>> Inscribed beside this is the following info: >> 5.1Vdc, 8.1A, 9W A nit... I assume this is a typo... no 90 module draws more than 1.8A from the 5V supply. >> The customer wants to know if he can provide + 5Vdc directly into >> the back of this unit and have it work, Yes, but... >> ...and be supported. I don't know what it would take to be able to answer yes to this. We qualify our products with our own power supplies... the ones they ship with. Although you might think "five volts is five volts," all power supplies have different characteristics in many ways. Since we've never qualified the 90C to work with your customer's supplies, how could we make all the promises which we'd need to in order to "support" it in that configuration? Just as an example, we'd have no way of guaranteeing FCC compliance, since the characteristics of the power system play a significant role in this area. >> If yes, what type of connector should I tell him he needs to >> supply, ie, is it a mini-din? I don't know if that is the technical name for it, but it is an industry-standard 7-pin small DIN connector. We didn't go out of our way to have a connector made up which is just different enough that it won't work with an industry-standard connector.

    >>  Inscribed beside this is the following info:
    >>	5.1Vdc, 8.1A, 9W
    
    A nit... I assume this is a typo... no 90 module draws more than 1.8A 
    from the 5V supply.
    
    
    >>  The customer wants to know if he can provide + 5Vdc directly into 
    >>  the back of this unit and have it work, 
    
    Yes, but...
    
    
    >>  ...and be supported.
    
    I don't know what it would take to be able to answer yes to this.  We
    qualify our products with our own power supplies... the ones they ship
    with.  Although you might think "five volts is five volts," all power 
    supplies have different characteristics in many ways.  Since we've never 
    qualified the 90C to work with your customer's supplies, how could we
    make all the promises which we'd need to in order to "support" it in
    that configuration?
     
    Just as an example, we'd have no way of guaranteeing FCC compliance,
    since the characteristics of the power system play a significant role
    in this area. 
    
    
    >>  If yes, what type of connector should I tell him he needs to 
    >>  supply, ie, is it a mini-din?
    
    I don't know if that is the technical name for it, but it is an
    industry-standard 7-pin small DIN connector.  We didn't go out of 
    our way to have a connector made up which is just different enough 
    that it won't work with an industry-standard connector.