[K12OSN] Gigabit headach

["Terrell Prudé, Jr."]

Oops--I meant "802.3ab".  Sorry 'bout that.

Terrell Prudé, Jr. wrote:

> Then you'd better bring the folks who did the cabling back in and tell 
> 'em to actually follow the Cat5 specs this time.  You may wish to 
> float the insinuation of possible legal action if they buck.  IEEE 
> 802.1ab says quite explicitly that 1000BaseT will work across existing 
> Cat5-spec wiring plants.  There was a similar problem back in the 
> 1990's, when 100BaseTX was first getting deployed.  Some cabling 
> installers cut corners and used Cat3 RJ-45 plugs and even Cat3 patch 
> panels during their "Cat5" installs!  Of course, this completely broke 
> the 100Mb connectivity.  As you can imagine, there was--umm, more than 
> one lawsuit over this.
>
> From what you're saying, you're going to have this problem no matter 
> whose Gig-E copper switches you buy.  The spec is the spec.
>
> Another option is to run some fiber links and get some mini-GBIC 
> modules from Amer.com.  I've used their fiber modules with success, so 
> I know they work.  This afternoon, I also did a 1000BaseT (i. e. 
> copper) connection from a spare SR48G2i switch to my Catalyst 3550 and 
> pumped about 600Mb of traffic across it w/ no errors (multiple ISO 
> image FTP transfer), so now I _know_ that 1000BaseT on those switches 
> does indeed work.  Unless you need GVRP support (you'll know if you 
> do), you made a good purchase.
>
> --TP
>
> Shane Stafford wrote:
>
>> oh knowing who did our cabling and the fact we just purchased 5 of these
>> switches, this is not a good thing.
>>
>> ah well, life stays interesting
>>
>> Shane
>>
>> "Support list for opensource software in schools." 
>> <k12osn at redhat.com> on
>> Tuesday, August 31, 2004 at 7:12 PM -0500 wrote:
>>  
>>
>>> On Mon, 2004-08-30 at 22:46, Duane Wilson wrote:
>>>   
>>>
>>>> I took everyones advice and bought the amer.com  SR24G2.
>>>>
>>>> Installed it between server and terminals.
>>>>
>>>> Tried to boot terminals all at once - nada!
>>>>    Would not even get DHCP
>>>>
>>>> Tried one terminal.
>>>>    Got DHCP but choked on 'loading vmlinuz'
>>>>
>>>> There is about 230 ft. of cat Ve from the server to the AR24G2.
>>>>
>>>> Is that too far?
>>>> Did I crimp the end wrong?  (It works fine when connected to the old
>>>>     
>>>
>>> 100   
>>>
>>>> Mbit)
>>>> Is my switch bad?
>>>>
>>>> Anyone???
>>>>
>>>>
>>>> Thanks,
>>>> Duane Wilson
>>>>
>>>>
>>>>     
>>>
>>> I agree with Terrell.  The tolerances for Gig vs 100mb are 
>>> substantial. Just because it works with 100mb does *not* mean it 
>>> will work with gig. Take it from a person who has already gone 
>>> through what you are going
>>> through.  Check your cabling.  It has to be done *perfectly* for gig to
>>> work over copper.
>>>
>>> Jack
>>>
>>>
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>>>   
>>
>>
>>
>>
>> Shane Stafford, MCSE, MCT
>> Director Information Services Glenburn School and Town
>> Educational System Integrator/Network Engineer
>> S & B Consulting
>>
>>
>> _______________________________________________
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>> For more info see <http://www.k12os.org>
>>
>>  
>>
>
>


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