nanog mailing list archives
Re: DS3 Coax..
From: Jim Segrave <jes () nl demon net>
Date: Tue, 22 Apr 2003 20:02:26 +0200
On Tue 22 Apr 2003 (09:32 -0700), Josh Richards wrote:
Makes sense but... Before fiber and ADMs were so common, in the days of buried coax for DS-3s (between COs and for the occassional large customer), coax was obviously being used for inter-building connectivity. How exactly did the topology differ? Besides fiber, which eliminates the issue of ground loops and such altogether, how did the RBOCs actually deal with this problem when they didn't have fiber in the ground? I presume there's an element/architecture that can be used safely. Mike alluded to a 'GID' per Sprint. Anyone have a reference/source for this device?
One easy way would be to use baluns and go from 120 ohm balanced on RJ45s in the buildings to 75 ohm coax between buildings. Or you can probably find a supplier of 75 ohm 1::1 transformers suitable for data traffic. Both should provide isolation and allow a floating ground. -- Jim Segrave jes () nl demon net
Current thread:
- DS3 Coax.., (continued)
- DS3 Coax.. Mike (meuon) Harrison (Apr 17)
- Re: DS3 Coax.. Roy (Apr 17)
- Re: DS3 Coax.. Neil J. McRae (Apr 17)
- Re: DS3 Coax.. Mike (meuon) Harrison (Apr 17)
- Re: DS3 Coax.. Robert E. Seastrom (Apr 17)
- Re: DS3 Coax.. Stephen J. Wilcox (Apr 17)
- RE: DS3 Coax.. Timothy R. McKee (Apr 19)
- Re: DS3 Coax.. David Lesher (Apr 19)
- Re: DS3 Coax.. Josh Richards (Apr 22)
- Re: DS3 Coax.. Mike (meuon) Harrison (Apr 22)
- Re: DS3 Coax.. Jim Segrave (Apr 22)
- Re: DS3 Coax.. Stephen Sprunk (Apr 22)
- DS3 Coax.. Mike (meuon) Harrison (Apr 17)
- Re: DS3 Coax.. Dave Israel (Apr 17)
- RE: DS3 Coax.. Robert Blayzor (Apr 17)
- Re: DS3 Coax.. Andy Ellifson (Apr 17)
- Fiber Converters, was RE: DS3 Coax.. Christopher J. Wolff (Apr 17)
- Re: Fiber Converters, was RE: DS3 Coax.. Dominic J. Eidson (Apr 17)
- Re: Fiber Converters, was RE: DS3 Coax.. Spencer Wood (Apr 17)
- RE: Dealing with ARIN.. my experiences & tips Brian Johnson (Apr 14)