Brian
We started doing 3 port solutions and found that as soon as you added
the third port the throughput dropped by 1/2 on the last port this was
with the latest version. With two ports it works great! Scalability is
still an issue as the limit is 64 per SYSTEM but this could be up'ed to
128 if need. Also anything over 700Mhz is just over kill this is where
the performance tops out.
If you need help hit me off list at tony@demarctech.com and I will do
all I can to help.
Sincerely
Tony Morella
Demarc Technology Group
Office: 908-996-7995
Cell: 908-246-9170
Fax: 908-847-0202
email: tony@demarctech.com
http://www.demarctech.com
Open Chat Server http://www.demarctech.com:8000
Yahoo IM: tonymorella
Wireless Solution Provider
-----Original Message-----
From: karlnet-admin@WISPNotes.com [mailto:karlnet-admin@WISPNotes.com]
On Behalf Of Brian H. Oak
Sent: Saturday, September 14, 2002 3:27 PM
To: karlnet@WISPNotes.com
Subject: [Karlnet] Super TurboCell Base Stations?
I am looking for some kind of super-duper TurboCell base station. I
have tried products from several different manufacturers, but am still
at a loss. Our current standard base station is the Agere COR-1100 or
Avaya COR-II, but I know I can do better when it comes to throughput.
I have used C-Spec RF-11+es in the past, and found them to be the
fastest thing available. The C-Spec product has several disadvantages,
however:
}} Only 1 radio and 1 FE port, making base installs complex, ugly, and
expensive
}} Lack of support for newer KarlNet images
}} Inexpensive moving components (read: fan) can break down and ruin
base
}} Over-all reliability is very low, short MTBFs
}} Problem resolution takes a long time, sometimes forever (i.e. some
problems have never been solved, seem to have been forgotten by the
folks at C-Spec)
}} The cost of the RF-11+ is comparatively very high, although I would
be willing to pay that much in the absence of these other problems
Additionally, I have done extensive testing of the FE interfaces on the
RF-11+es: I found their 100Mbps Full-Duplex flow control to be
ineffective, forcing static configuration at 10Mbps Half-Duplex. In a
way this makes sense, since the radio interface is limited to 11Mbps
nominal. But the FE interface itself should handle flow/congestion
control so that very few frames are unanswered and dropped. In all
fairness, this might be a problem with all FE interfaces on KarlNet
boxes, I haven't done such testing on the only other FE-available boxes
of which I know, the COR-1100s.
I have to wonder, though, if a FE interface with a chipset from one of
the premier NIC manufacturers (Intel, 3Com, etc.) wouldn't do a better
job -- and if more traffic I/O RAM should be used to allow more of a
traffic-shaping thing to happen in the store-and-forward switching
process. That would, theoretically at least, make it so that no traffic
was lost, it would just be stored until it could be doled out over the
slower radio interface. This is the kind of thing that "real" routers
do all the time, going from a 100Base-TX interface to a 1.544Mbps T1.
Anyway, I'm looking for a manufacturer who has built a box with the high
throughput I know can be achieved, without the major downsides mentioned
above. Anyone know of one?
I'm thinking of a box, 19" rack-mountable (no more than 2RUs), running
one of the newer CPUs => 1GHz, lots of RAM, capable of supporting up to
four radio interfaces and multiple FE interfaces, all running the
KarlNet v4+ TurboCell software. If I can't find someone making a box
like this, I might just start making them myself. That is, of course,
assuming I can get someone at KarlNet to return my phone calls (no
success so far). Is anybody else interested in such a product?
Thanks,
-Brian ____________________________________________________________
Brian H. Oak CISSP?CCDP CCNP CCA NNCAS Datawav-IS, LLC
Principal Engineer? ?? 109 N. Arthur Ave., Ste. 301
(208) 232-6860???????????????? Pocatello, ID? 83204
(208) 232-0185?fax???????????? ?? ??brian@infosystems1.com
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