daveL said:
What? What is 20 mbs for 802.11g? It can't be 20 Mega Bytes Per Second, since that's 160 Mega Bits Per Seconds, which is obviously more than twice the stated 802.11g spec of 54 Mega Bits Per Second. So, I have to assume you mean 802.11g will deliver, on average, 20 Mega Bits Per Second, which is equal to 2.5 Mega Bytes Per Second, which is less than 10% of the performance of a *cheap* disk drive.
Next, where on earth do you get 30 Mega Bits Per Second (3.75 Mega Bytes Per Second) for 100TX wired ethernet? Switched (meaning no collisions) 100TX ethernet, which is full duplex (if you know what that means), is giving you a minimum of 10 Mega Bytes Per Second simultaneously in both directions (send, receive).
I really don't think you know what you're talking about. E&Y accessing a SQL database that uses disk drives that are remote over a 802.11g network? There is not fricking way they would do that! I believe you are confused. There may be clients (Windows, browers etc) that access the database over 802.11g, but I can guarantee you the the disk drives for the database are directly connected to the SQL server with either SCSI, Fiber Channel or the latest SATA channels. There is such a thing as SCSI over TCP/IP, but they normally use wired 100TX, at a minimum, or 1000TX (gigabit ethernet).
Yes I meant bits, Apologies for omitting the little p. Typo. I would have thought it was obvious I had made the error of omission otherwise Id just created a new 802.3 standard when referring to Ethernet.
Secondly, have you ever really done a test with Ethernet and tried to drive it as fast as it will go between two points (not theoretical), not switched but a direct drive. Youll be lucky to get close to 50 mega bits per second. Not quite sure where your getting your 10mbs from (or 80mbps). And lets not forget you are likely to have a mass of switches on your network, which slows things down.
The point is that for most tasks the speed difference between a fully wired drop to the desktop and a wireless delivery to the desktop is just seconds, not minutes or hours but seconds. So its hardly noticeable.
And yes I do know what full duplex means. It replaced legacy Ethernet, which was half duplex. Half duplex meant that data could only move in one direction at any given time. Full duplex allows end devices to transmit to the switch at the same time as the switch transmits to them. This means the achievement of a collision free environment.
And yes your right the disk drives would be connected via a fibre channel or 1000TX (not sure as I never asked that question, but my guess is that in Canada it was 1000TX because he talked about a Gigabit backbone), but we werent talking about the disk drives being connected to the server in this example. We were talking about a guy connecting to an external hard drive. So my point held, as it wasnt a description of how a server accessed information from a disk drive. I was just referring to how a user sitting at a terminal accesses information across a network. The confusion was on your part, reading to much into what I said and looking for an argument (get a life, get laid soon!, or stop taking so much caffeine! Thats humor, so dont throw your toys out of the pram, your supposed to smile).
I didnt give a lengthy description of their network, I gave a brief statement specifically talking about how the end user was accessing and sending data from one point to another; namely a terminal to an access point. I know a little about E&Ys network because I used to work with their former assistant IT director (Canada). As Im sure your aware; their backbone is 1000TX. Their LAN is Cisco based, their main switch is a 3500, they have a Cisco Call manager PBX linked to a Nortel Option 51c & 81c (depending on which office your in) and runs on a dual processor server. And before you say call manager cant run on a dually, if you get the right server remove one of the processors and tweak it a bit - the software will load. Once the software has done its diagnostic to load onto the system, you can put the processor back in and install extra RAM etc etc and the software will still run.
Lighten up, I dont mind you correcting my error in regard to mbs and mbps, but honestly to try and make an argument and read into things that werent inferred or implied is just plain silly. I didnt claim to be a CCIE, and Im sure your not either.
Jason