ISP Information:
Because of the amount of signals that SCSI format sends through small wiring, termination is required. The termination is accomplished by using resistors across certain signal wires. If the chain were not terminated, the signals would bounce off the end of the chain and cause interference with real signals.
ISP Glossary:
SCSI Termination - On Thu, 2004-09-02 at 16:57, editor@telecom-digest.org wrote: [TELECOM Digest Editor's Note: That's an old trick, but quite effec- tive. Place (and enforce) the blame on the last person or entity in the line unless *they* can push it further along. And believe me, when push comes to shove, they *will* find someone further down the line to hand the hot potato to. You give them one or two passes with a firm warning there will be no further excuses allowed, then watch how the conditions so prevalent in much of telephony get corrected/cured in a hurry. I for one, cannot see why *any* user or subscriber should ever be allowed to tamper with their own caller ID.Because the place that is calling, might not be the place to acceptcalls. If I hire a firm in India to do all my call solicitations, I'drather people reply back to a number in the US, wouldn't you? Ditto with spam and virii hassles. If Microsoft, and the makers of hardware got together and devised a nearly foolproof method of *absolutely without question identifying every piece of equipment out there* then spam and virus writing/spreading would come to a screaming halt. Consider the ESN (electronic serial number) on your cellular phone. Some one steals it, and just a phone call from you to the carrier blacklists it forever. It will never again talk or recieve calls, as the number propogates through the hot lists. I don't hear anyone complaining that the propogation of their cell phone's ESN is somehow a 'violation of privacy rights' when a cell tower picks up the user's transmission and deals with it. Why should anyone (except spammers of course) complain when an ISP passes their traffic and looks at the computer 'electronic serial number' which has been burned in the hardware, and while not totally impossible to diddle with would frustrate most spammers totally.Unfortunately, there's more to it than that. Every device connected tothe internet would need this serial number. And there'd have to be someway of not being able to spoof it, which would require some sort of PKI(because otherwise, I could just simulate the serial number in software,and pick what I want).There are several major issues:1. The current protocol doesn't support any sort of serial number.You'd probably have to develop a whole new protocol, or admit the ideathat if you put it in an RFC-1822 header, it could be spoofed by anyonewho cared.2. Everyone would have to replace all their hardware.3. Most of the systems on the internet that don't have people attheir console (like mailservers, routers, webservers, databases) don'trun Microsoft software. These send the majority of email, things likenotifications, alerts, etc.4. You're implementing this in software the user can control (andanyone who has physical access to their system can control the hardware,and thus the software on it). Those that are malicious would circumventthis by either replacing the driver that reads the chips' serial number,or simply using someone else's machine, and their serial number.People's machines are already being used to relay spam without theirknowledge, it'd be just one more step to include their identifier in it.And more importantly, and this is a big one:This doesn't buy us anything we don't already have. Spam CAN be trackeddown to its source, and it regularly is. Grandma's computer does get itsinternet shut off when it's massively sending spam. But is it helping?No. The scale of the attacks are far too great, and there's alwayssomething vulnerable. The problem of the matter is that sure, you get alot of problems from (let's just say) Comcast users. Block them.Disconnect your paths to them. If you use them, switch to someone else.If you're an ISP, cut your peering to them.Good. Hope your customers don't need to receive any business fromComcast users. So when your customers call to complain that they can'treach their website you host from their house, what are you going totell them? Comcast told them you were blocking them. Now what? Tell themthat because 2% (in other
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