At 8:44 pm +1000 5/3/07, Andrew wrote:
Yes the built in power supplies are the way to go.
No I seem to remember the backplane affects all data through the
switch not just when you link it to another switch.
so from google;
the backplane bandwidth
This is the total rate of packet or bit throughput that the switch
can handle through all ports at once. If you have an 8 port 100Mbps
switch, you need a backplane bandwidth of 400Mbps to allow all 4
pairs of ports to talk at the same time
Is that the same as the switching bandwidth??
FWIW, the Netgear 24port unmanaged gigabit switch (under $500) has
48Gbit/sec switching bandwidth and the 16 port version has the exact
same 48Gbit/sec. The managed layer 2 version has the exact same
bandwidth, larger packet buffer, but with lower MTBF (6.5yrs vs 10)!
I like products that quote an engineering MTBF, because it is a
measured and public statement of reliability.
Linksys SR2024 at harris has ?a lifetime warranty, at instantit has a
5 year warranty, in the downloadable user manual has a 5 year
warranty but says has to be returned to USA at your cost both
directions. Probably an excellent product but the warranty terms seem
a bit unclear. Can Greg clarify??
Can't see a need for a managed switch in a small installation - much
different in a complex corporate network - a complicated organisation
with complex IT requirements.
Ian.
sounds about right.
And you can dumb down certain ports to allow things like echo
cardiograph machines to connect at 10mbps, most of them are kinda
old and refuse to negiotiate with gigabit switches.
- If you don't see the need for managed switches in surgeries, you
ain't looking after big enough surgeries Pete :)
Andrew.C
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Peter Machell
Sent: Monday, 5 March 2007 8:13 PM
To: General Practice Computing Group Talk
Subject: Re: [GPCG_TALK] Which switch?
On 05/03/2007, at 7:28 PM, Andrew wrote:
Sorry I was wrong about the price of the Dell managed 24port gigabit
switches,
They are more like $1500 each.
The potential throughput is the key though, all to do with the speed of the
backplane.
That's why some switches are more expensive than the d-link/netgear types.
There was a good review site for switches somewhere...
but a quick search on the Steve Cassidy (real world) articles at
<http://www.pcpro.co.uk>www.pcpro.co.uk will turn up some
interesting real world examples of good
and bad switches.
You only get what you pay for.
I guess smaller surgeries don't need the huge speed across the backplane.
However when ou start using nearly all the 24 ports you will notice a
difference.
Andrew, backplane speed is only an issue if you are using it - that
is, linking to another, usually identical switch.
Managed switches are, well they're managed - they have an IP and a
web and/or CLI interface. You can do things like create VLANs, you
can see stats on throughput and manage, to a certain degree, each
port.
I don't see much need for a managed switch in a surgery situation,
but agree that a better quality switch will give better performance.
As I don't buy Dell I have no opinion on them. I like both Netgear
(but only the metal ones with a built-in PSU ie. the dearer ones)
and Linksys, and dislike D-Link and Netcomm - too many failures seen
in these.
regards,
Peter.
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