Network Problems

[Rick Stevens]

brad.mugleston at comcast.net wrote:
> Thanks for the reply Mark,
> 
> I'll try your suggestions tonight.  About the X-Box.  Yes, it connects to the internet so what it's telling me is the modem is talking to the LinkSys box and the downlink is getting to my basement switch/wireless box as both the X-Box and wireless connections seem to work (I haven't tested the other connections from the basement but they are probably working.
> 
> The linksys has 5 out put lines (one a down link the other four switches) I'm not sure how all that is wired but there must be some separation between the down link to isolate it from a power surge or what ever killed the other lines.  I was under the impression that I had either #4 to hook a computer up to or I could use the down link which I thought just crossed a few wires to get the connection to work but I may be wrong.
> 
> I'll unhook everything and cycle the power again then try your one up check.

If you use standard MDIX cables (orange pair on pins 1 & 2 on both
ends), make sure you have the downlink cables plugged into the "uplink"
ports on the other four switches.

Note that the "uplink" port is usually tied into the last port on the
switch and has the wire pairs on pins 1/2 (usually the orange pair) and
3/6 (usually the green pair) swapped.  In other words, you can use the 
last port OR the uplink port, but not both at the same time.  It just
saves you from buying a "swapped" or MDI cable.

For those who want to know...

	Standard (MDIX) wire colors (used for switch to computer
	connections):
	Pin	Connector One	Connector Two
	---	-------------	-------------
	1	Orange/White	Orange/White
	2	Orange		Orange
	3	Green/White	Green/White
	4	Blue		Blue
	5	Blue/White	Blue/White
	6	Green		Green
	7	Brown/White	Brown/White
	8	Brown		Brown

	Flipped (MDI) wire colors (for switch to switch connections):
	Pin	Connector One	Connector Two
	---	-------------	-------------
	1	Orange/White	Green/White
	2	Orange		Green
	3	Green/White	Orange/White
	4	Blue		Blue
	5	Blue/White	Blue/White
	6	Green		Orange
	7	Brown/White	Brown/White
	8	Brown		Brown

An "uplink" port does the MDI flip for you so you can use a standard 
cable, but use the "uplink" port on ONE switch ONLY.

Pin 1 is on the left when looking at the non-latch side of the connector
with the cable towards your body (crappy ASCII art follows):

	 12345678
	|--------|
	||||||||||
	||||||||||
	||||||||||
	||||||||||
	||||||||||
	|--------|
	   !!!!
	   !!!!
	   !!!!
	   !!!!
	   !!!!

----------------------------------------------------------------------
- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-     Warning:  You are logged into reality as the root user...      -
----------------------------------------------------------------------