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OK, I
opened my mouth before I finished my research. I am completly wrong. All three
pins are tied to a resistor network effectivly tieing them high. It has been
that way from then begining and still is. Oops
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tom Haynes Sent: Friday, August 08, 2003 12:46 AM To: [EMAIL PROTECTED] Subject: RE: [smartBridges] MAC fixed at 10M/half no auto negotiate This
was based off of an older (w/ 50' tail) unit using a visual inspection only. If
the circuit board is multi-layered then I could be completely wrong. It has
already been brought to my attention that the actual circuit diagram of some
version of the unit is different than what I noticed.
DICTIONARY
ABo =
smartBridges airBridge Outdoor
MAC =
Media Access Controller, the part that knows how to talk
"Ethernet"
duplex
= both directions at once
negotiation = a means for two units to decide how to
communicate
advertisement = one unit telling anything listening how to communicate
with it
ANEG =
abbrv. for auto-negotiate
pin =
a shiny metal tab sticking out of the squarish hunk of plastic, meant to carry
an electrical current
tied
high = a signal voltage above ground, in this case 3.3v
tied
low = when the pin is grounded
high-z
= high impeadance
RF =
Radio Frequency
IF =
Intermeidate Frequence
issues
= problems that are incompletly verbalized or uncommon and look better when
called issues
features = bugs that end up actually being usefull
"I am
of the opinion" = a long winded way of saying "My guess, 'cause I don't really
have a clue"
Sorry
Folks, I couldn;t help myself :-)
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of phantam Sent: Friday, August 08, 2003 12:11 AM To: '[EMAIL PROTECTED]' Subject: RE: [smartBridges] MAC fixed at 10M/half no auto negotiate GO TOM! I missed what
half of those words meant but hey more power to you, actually in all good sense
it does make sense is this in only the older ones or the newer ones as
well? From: Tom
Haynes [mailto:[EMAIL PROTECTED] I was researching componants on an
older ABo and noticed that the pins on the Media Access Controller that control
speed, duplex and negotiation were all unconnected. When
these three pins (11, 40 and 42) are low the MAC is forced in to 10Mb
mode half duplex and auto-negotiation advertisement is turned off. I would
think that ANEG (pin 40) should be tied high so that the device pluged in
to it would not have to rely on a fall back feature to guess at the speed?
Should pins 11 an 42 be tied low instead of being left open? I assume that being
left open allows them to be influenced by RF and IF noise as well as static to
the point where the MAC can't decide if they are HI or LOW or thinks they are hi
due to the HIGH-Z state they are in. I am of the opinion that some of the
ethernet related issues are causes by this HIGH-Z
state. |
Title: Message
