Check out section 9.10 "Compatibility with former IBN Equipment with
CBN Currents". I think this more directly relates to the signal connections,
whether or not, they have to be isolated from the equipment chassis until
grounded at the Isolated bonding point.
I don't think(?) isolated bonding is much used these days. I know we
used to make equipment that keep signals from chassis (grounding the chassis to
the rack) but most of the RBOC's also wanted the ability to make a signal to
chassis ground, and most seemed to be using that connection.
This is one of the more confusing issues, at least to me on the NEBS
specifications. Still not sure I know what it says.
Gary
-----Original Message-----
From: Joe Finlayson [mailto:[email protected]]
Sent: Tuesday, September 10, 2002 9:03 AM
To: 'John Juhasz'; 'Dorin'
Cc: 'EMC-PSTC - forum'
Subject: RE: Inrush and EN61000-3-3
John & Dorin,
Please clarify as I am not aware of a requirement to isolate Signal
Ground from Frame Ground. Please reference GR-1089-CORE, Section 9.6.2 as
well.
Thx,
Joe
-----Original Message-----
From: John Juhasz [mailto:[email protected]]
Sent: Tuesday, September 10, 2002 11:12 AM
To: 'Dorin'
Cc: 'EMC-PSTC - forum'
Subject: RE: Inrush and EN61000-3-3
Be careful Dorin. For Central Offices, they need to be isolated.
John A. Juhasz
GE Interlogix
Fiber Options Div.
Bohemia, NY
-----Original Message-----
From: Dorin [mailto:[email protected]]
Sent: Tuesday, September 10, 2002 9:12 AM
Cc: 'EMC-PSTC - forum'
Subject: Re: Inrush and EN61000-3-3
Hi,
I am looking for a comparison, pros and cons, on the signal ground
connected versus not connected to the chassis in a telecom system. Any
help is appreciated.
Thanks,
Dorin
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