🚀 go-pugleaf

On Tue, 13 Apr 1999, Barry Smith <Sax@wychcraft.demon.SPAMco.uk> wrote:
>On Sat, 10 Apr 1999, Michael Salem <4ms2u$ms@michaels.demon.co.uk>
>wrote:
>>> > Does anyone know what the limit is for max length of CAT 5 cable between
>>> > a workstation and a hub. I have to extend our network over a distance of
>>> > about 600 metres too multiple workstations. I am presuming that this
>>> > would need some form of booster. Also I believe that there is limit to
>>> > the number of hubs that can be joined on an ethernet network and that
>>> > this is fairly low, something like 5  24 port hubs, is this correct or
>>> > am I talking rubbish.
>>> 
>>> Each utp cable max is 100 metre. I believe you can cascade 4 hubs
>>> together so the path between any 2 workstations cannot have more
>>> than 4 hubs. If however you use hubs with bnc and use a thin
>>> ethernet backbone, then you should be able to connect 30 hubs
>>> together.
>>
>>Additional notes: the maximum length of a thin Ethernet segment is 
>>185m; thick Ethernet will go to 500m. Fibre will handle 1km 
>>inter-repeater length. With some small print (distances are shorter 
>>if the maximum permissible number of repeater sets is used).
>>
>>I don't see that you can connect 30 hubs: wouldn't they fall foul of 
>>the IEEE standard:
>>   
>>   The transmission path permitted between any two DTEs may consist
>>   of up to five segments, four repeater sets (including optional
>>   AUIs), two MAUs, and two AUIs. 
>>
>>Best wishes,
>
>30 hubs may coexist on a 10Base-2 or 10Base-5 (Thin or thick) ethernet
>segment, as there is a maximum of two repeaters between any two DTE's.
>Thus the backbone may consist of up to three segments separated by two
>repeaters.
>

MAJOR CORRECTION..... I should have said Router, not repeater. Very
sorry.

Anything in excess of this will require two or more seperate ethernets.
In other words use a router to separate nets. A router is a device
that has addressing tables which allow it to determine which port, if
any, to forward a packet on. Depending on the number of DTE's involved,
subnetting may be a possibility here. And of course, the coaxial
segments may be dispensed with altogether, if you fit UTP adapters to
the router's AUI port. Finally, not recommended, but a possiblity
dependent on the volume of traffic is the use of overlength drop leads.

>Dont forget, that the 100M hub to DTE limit should take account of patch
>leads and drop leads, so if you using 2.5M on each, the maximum allowed
>on your cabling system (socket to socket) is 95M. However, some sites do
>choose to push this overspec. The tradeoff is at the expense of
>increased collision frequency, which again is a function of net traffic.
>I'd advise adhering rigidly to the limits if you anticipate ever running
>the network at speeds > 10MHz.
>
>Finally, fibre will handle considerably more than 1km inter-repeater
>distance if you specify monomode fibre. Sorry, but I don't have precise
>figures to hand.
>

-- 
Barry Smith
Email: sax (at) wychcraft.demon.co.uk <--  I don't want ANY spam!