nanog mailing list archives
Re: dry pair
From: Ian Mason <nanog () ian co uk>
Date: Sat, 30 Aug 2003 00:43:37 +0100
At 23:03 29/08/2003, Joel Jaeggli wrote:
On Fri, 29 Aug 2003, Patrick Felt wrote:
[snip]
> If not, > how would the alarm company get the signal pushed through the fiber, and > could that be done with the dsl signal? The alarm companies need to deliver extremely small amounts of data which can range from make or break circuits to 60 300 or 2400bps data for things like building control systems, that's a considerably different problem than try to ram 1-7mb/s through a 25,000 foot long piece of wire.
Not necessarily, the bit rate may be higher. Good modern alarms use a cryptographically secured bitstream to provide the anti-tamper part of the line protection. A cryptographically useful message size with a reasonably short delay between 'raise alarm' and 'indicate alarm' requires a fair bit rate.
Current thread:
- RE: dry pairs, (continued)
- RE: dry pairs Joel Jaeggli (Aug 29)
- Re: dry pairs David Meyer (Aug 29)
- RE: dry pairs Joel Jaeggli (Aug 29)
- RE: dry pair Ejay Hire (Aug 29)
- RE: dry pair Austad, Jay (Aug 29)
- RE: dry pair Temkin, David (Aug 29)
- RE: dry pair Ejay Hire (Aug 29)
- RE: dry pair Mark Segal (Aug 29)
- RE: dry pair Randy Neals (ORION) (Aug 29)
- Re: dry pair Patrick Felt (Aug 29)
- Re: dry pair Joel Jaeggli (Aug 29)
- Re: dry pair Ian Mason (Aug 29)
- RE: dry pair Randy Neals (ORION) (Aug 29)
- Re: dry pair Patrick Felt (Aug 29)
- RE: dry pair Dr. Jeffrey Race (Aug 29)