[WinMac] Re: Ethernet troubles

Dan Schwartz(expresso[at]snip.net)
Tue, 09 Mar 1999 19:34:55 -0500

        Hmmm... This is a good one!

        There are a few possibilities, all interrelated to impedance:

        1) The solid cable is slightly out of spec, but the stranded cable is
closer to spec;

        2) The hub itself is marginal - Either the power supply voltage to the
backplane, or similarly as the current load increases the voltage drops;

        3) The output impedance of each/any of the Macs is out of spec... This is
unlikely due to the variety of Macs you are using.

        My suggestions:

        A) Try another hub, preferably of another make/model;

        B) Boost the AC voltage to about 130 - 135 volts to the hub in case the
hub power supply is marginal.

        ¿ Is your uplink (Port 16) UTP or AUI (coax)? The power drain for AUI is
much higher...

        This is definitely an electrical problem...

        Cheers!
        Dan

At 03:33 PM 3/9/99 -0600, you wrote:
>I have a problem I hope someone can help with. I subscribe to a couple other
>lists but this one seems to have the most professionals responding.
>
>I have been setting up a Mac network for a small town newspaper over the
>last few weekends. The network consists of a mix of Apple 6100's, 7100's
>8100's, G3's and 3 laser printers. All boxes are running OS 8.1 or 8.5. The
>x100's have Farallon ethermac transceivers and all boxes are connected to a
>Farallon Starlet 16 port hub using Belden brand Cat5 bulk solid core wire.
>
>The problem we were running into is that when we got to plugging a machine
>into the last port in the hub, the hub would only recognize 'stranded' cat5
>cable (not solid core). It didn't matter which machine it was. If it was
>going into port 15 it would only 'see' stranded cable. (Port 16 was not
>available because the uplink port is in use.) Has anyone heard of this? The
>cable run to the last port was not more than 30 feet. Most of the cables are
>~50ft.
>
>We got the whole thing running but I am curious as to why the trouble with
>the solid core cat5. Is it that solid core sucks?
>
>Any insight will be appreciated.
>
>--
>Nick Scalise
>nicks@radiks.net
>

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