Connecting two Gigabit Switches Together

Connecting two Gigabit Switches Together
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Subject Author Date
Connecting two Gigabit Switches Together ajay.sood 12-05-2007
Posted by on December 5, 2007, 7:21 am
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Hi,

I was wandering if someone could help me..

I have a home network setup that includes two US robotics Gigabit
switches a 16 Port Swithch (USR 997932A) and an 8 port (USR 997933)..
I am trying to connect these two switches together using a standard
(working) cat 5e cable without any success.

If i connect a server to the 16 port switch and then connect a pc to
the 8 port switch and try to ping the server it fails... however if I
connect the pc to the same 16 port switch it all works fine... is
there a problem with connecting two gigabit switches together?

Constants:-

* I have tested both switches independently and they work fine
* i have tested and replaced all cat 5e cables and again they are
fine.
* The PC's have DLINK Gigabit NIC cards installed and these work
fine.

Can anyone suggest why I might be having a problem?

regards
Ajay

Pure Networks
Posted by glen herrmannsfeldt on December 5, 2007, 6:40 pm
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ajay.sood@gmail.com wrote:


> I have a home network setup that includes two US robotics Gigabit
> switches a 16 Port Swithch (USR 997932A) and an 8 port (USR 997933)..
> I am trying to connect these two switches together using a standard
> (working) cat 5e cable without any success.
(snip)

> Can anyone suggest why I might be having a problem?

How sure are you that the cable is good? Specifically
that it isn't mispaired? Is it a commercial four pair cable,
or homemade?

-- glen


Posted by Justa Lurker on December 5, 2007, 10:57 pm
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glen herrmannsfeldt wrote:
> ajay.sood@gmail.com wrote:
>
>
>> I have a home network setup that includes two US robotics Gigabit
>> switches a 16 Port Swithch (USR 997932A) and an 8 port (USR 997933)..
>> I am trying to connect these two switches together using a standard
>> (working) cat 5e cable without any success.
> (snip)
>
>> Can anyone suggest why I might be having a problem?
>
> How sure are you that the cable is good? Specifically
> that it isn't mispaired? Is it a commercial four pair cable,
> or homemade?
>
> -- glen
>

Do they have Auto-X, or do you need to use a crossover cable ?

Posted by glen herrmannsfeldt on December 6, 2007, 1:00 am
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Justa Lurker wrote:

(snip)

> Do they have Auto-X, or do you need to use a crossover cable ?

Gigabit transmits and receives on all four pairs at the same time.
It is most obvious to connect two ports with a straight cable,
but they are supposed to also work with a crossover.

-- glen


Posted by Michelot on December 6, 2007, 3:45 am
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Bonjour Glen,

> Gigabit transmits and receives on all four pairs at the same time.
> It is most obvious to connect two ports with a straight cable,
> but they are supposed to also work with a crossover.

And now, reading your reply, I'm wondering how full-duplex is
possible. The Ethernet 100Base-T4 (never used) was also on four pairs,
and full-duplex was not possible.

For the Ajay question, what is the impact of Master and Slave
configuration for 1G?

Best regards,
Michelot

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