At 10:01 AM 1/4/01, Tony van Ree wrote:
>A couple of thoughts based on the PVC fault thread but looking at a
>different angle.
>
>Should we as aspiring "communications experts" understand:
>1 Fundamental electrical and magnetic propogation theory.
>2 Basic cabling technology, design and termination.
Yes. Cisco Networking Academy requires almost a whole semester on
electricity, cabling, building wiring, etc. Now, I think that's overkill,
but at least some study in these areas is a good idea if you want to be an
efficient troubleshooter.
Priscilla
>Well lets consider the number of faults that can be put into this
>category. It used to be 75%+ faults were of a physical nature. I think
>the figure would still be quite high but I don't have recent figures.
>
>Most intermittent faults are due to connections and/or connectors. Ofter
>due to poor installation and/or plugs being inserted and removed regularly
>and/or incorrectly.
>
>The next most common cause of intermittent faults is magnetic (Noise)
>interferance. Usually due to poor cabling layouts and/or poor
>installation methods.
>
>The most common cause of permanent damage to to ports is due to incorrect
>installation of cables (NT1 to Ethernet ports is a good one that comes up
>a lot).
>
>In switching the most common problems are duplex mismatches. Usually due
>to a misunderstanding of what duplex setting do.
>
>These are just some considerations there are heaps more. Most are easily
>avoided but difficult to diagnose. An understanding of the fundamentals
>involved can avoid disaster.
>
>Just as a beat up on all. I work in an environment where we supply Telco
>type services and IP connectivity to thousands (this figure is an
>understatement). A part of my job is to troubleshoot client connections
>to our access servers. I can often go for a week or two handling about 10
>faults or more per day without finding a fault in the configuration of the
>access servers, connections to the access servers and/or the clients
>CPE. This does not leave much but I'll bet most still blame us. I don't
>know how often I will suggest change this setting in your server an all
>will be fine. Bink up it comes and so does the question "what did you do
>at your end to fix my server?"
>
>Incidently the next most common problem I come across is username/password
>errors particularly where people mix cases and/or use non alphanumeric
>characters in usernames. In my opinoin this shouls be avoided (In Cisco's
>also). The term username in the Cisco sense is really a hostname (PPP)
>and should follow the Unix Hostmane rules to avoid stange issues.
>
>Most faults a simple and can be avoided by careful planning.
>
>Just some thoughts and ramblings from Teunis
>
>Teunis
>Hobart, Tasmania
>Australia
>
>
>--
>www.tasmail.com
>
>
>_________________________________
>FAQ, list archives, and subscription info:
>http://www.groupstudy.com/list/cisco.html
>Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
________________________
Priscilla Oppenheimer
http://www.priscilla.com
_________________________________
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
