What is a hub?
Bosco Tsang
"vampire,杏花村之虎" <vam...@vlink.net.hk> wrote:
>In networking, I find a device called "hub".
>What is the use of it? When will it be used?
To connect a number of computer together. With the use of hub, even if
one computer is down in the network, it won't affect others on the
same network. Of course, if you just have one or two computers in the
network, you don't need to spend extra on this device.
--
Bosco Tsang
Department of Geography
Hong Kong Baptist University
bts...@hkbu.edu.hk (http://www-geog.hkbu.edu.hk/btsang)
Snoopy 小路比
bts...@geog.hkbu.edu.hk (Bosco Tsang) wrote:
:)"vampire,杏花村之虎" <vam...@vlink.net.hk> wrote:
:)>In networking, I find a device called "hub".
:)>What is the use of it? When will it be used?
:)To connect a number of computer together. With the use of hub, even if
:)one computer is down in the network, it won't affect others on the
:)same network. Of course, if you just have one or two computers in the
:)network, you don't need to spend extra on this device.
By using a hub, the network is effectively a star-topology one, so
that the network will not down for any one of the network client down.
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Felix M.C. Li
vampire,杏花村之虎 wrote:
>
> In networking, I find a device called "hub".
> When will it be used?
A dump hub as a multi-port repeater. The hub boost the signal from one
port to the other ports.
Felix M.C. Li
vampire,杏花村之虎
Snoopy 小路比 wrote:
>
> bts...@geog.hkbu.edu.hk (Bosco Tsang) wrote:
>
> :)"vampire,杏花村之虎" <vam...@vlink.net.hk> wrote:
>
> :)>In networking, I find a device called "hub".
> :)>What is the use of it? When will it be used?
>
> :)To connect a number of computer together. With the use of hub, even if
> :)one computer is down in the network, it won't affect others on the
> :)same network. Of course, if you just have one or two computers in the
> :)network, you don't need to spend extra on this device.
>
> By using a hub, the network is effectively a star-topology one, so
> that the network will not down for any one of the network client down.
As far as I know, ethernet uses bus topology,
and I observe that each pc workstation in my office has a t-joint at the back,
is it true that if using t-joint, any workstation downs will stop the entire ethernet
network from functioning?
So, this is the sole cause of using hub, right?
Actually, is t-joint connection=diasy chain?
thanks.
vampire
--
****************************
*一切皆是命
*半點不由人
****************************
疆屍. (東方中國型)
mailto:vam...@vlink.net.hk
Lau Kwan Chi
vampire,杏花村之虎 wrote:
>
> As far as I know, ethernet uses bus topology,
> and I observe that each pc workstation in my office has a t-joint at the back,
> is it true that if using t-joint, any workstation downs will stop the entire ethernet
> network from functioning?
Yes.
> So, this is the sole cause of using hub, right?
I would say yes. There are other reasons too such as it supports fast
ethernet.
>
> Actually, is t-joint connection=diasy chain?
> You can say so. Its a bus whatever its a t-joint or a i-joint as long as
there's termination at both ends.
Felix M.C. Li
Lau Kwan Chi wrote:
>
> vampire,杏花村之虎 wrote:
> >
>
> > As far as I know, ethernet uses bus topology,
> > and I observe that each pc workstation in my office has a t-joint at the back,
> > is it true that if using t-joint, any workstation downs will stop the entire ethernet
> > network from functioning?
>
> Yes.
>
Depending on what is meant by down in your term. If the network card on the
workstation is not pulling the whole cable to low (shorted output), and the
cable is still connected together, it won't affect the network connectivity
of other networked workstation.
> > So, this is the sole cause of using hub, right?
>
> I would say yes. There are other reasons too such as it supports fast
> ethernet.
>
Another reason for using Hub is better cable and connection management. It is
easier to organize.
> >
> > Actually, is t-joint connection=diasy chain?
> > You can say so. Its a bus whatever its a t-joint or a i-joint as long as
> there's termination at both ends.
Indeed, T-joints make a connection to the 10base2 (BNC) cable like below
T-Joint T-Joint
50 Ohm +-----------+---------...Shield........-------+---------+ 50 Ohm
Terminator +--------+--|---------...Center wire...----+--|---------+ Terminator
| | | |
| | | |
| | | |
+--+--+--+ +--+--+--+
|LAN card| |LAN card|
+--------+ +--------+
Regards,
Felix M.C. Li
Ben Ng
slk...@hkstar.com (Snoopy 小路比) wrote:
>bts...@geog.hkbu.edu.hk (Bosco Tsang) wrote:
>:)"vampire,杏花村之虎" <vam...@vlink.net.hk> wrote:
>:)>In networking, I find a device called "hub".
>:)>What is the use of it? When will it be used?
>:)To connect a number of computer together. With the use of hub, even if
>:)one computer is down in the network, it won't affect others on the
>:)same network. Of course, if you just have one or two computers in the
>:)network, you don't need to spend extra on this device.
>By using a hub, the network is effectively a star-topology one, so
>that the network will not down for any one of the network client down.
Wrong !!! Actually, the ordinary hub is the role as a bus-topology in
ethernet. Star-topology is only the decriptiion of the Physical
Network Connection.
Best regard,
Ben Ng
ben...@vol.net
<<e-mail from HongKong>>
Richard Gear
vampire,杏花村之虎 wrote:
> Snoopy 小路比 wrote:
> >
> > bts...@geog.hkbu.edu.hk (Bosco Tsang) wrote:
> > By using a hub, the network is effectively a star-topology one, so
> > that the network will not down for any one of the network client down.
>
> and I observe that each pc workstation in my office has a t-joint at the back,
> is it true that if using t-joint, any workstation downs will stop the entire ethernet
> network from functioning?
>
>
> vampire
1 workstation down <> whole network down. Any problem in a section of
the ethernet cause malfunction in the whole network.
HUB provide much wider bandwidth than T-joint ethernet. HUB can extend
ethernet capability by allowing internal multiple separated data
transfers in parallel. But internal topology is not necessarily STAR.
T-joint connection is single media like this
_____________________________________________
| | | | |
Node Node Node Node Node
Diasy chain is like this (e.g. token bus/ring/SCSI/USB)
_________ _____________ __________........
| | | |
Node Node
--
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|Richard Wong |
|Email: chw...@hkueee.hku.hk |
|homepage://arch.hku.hk/people/richard|
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