Booting from a USB2 using backside/frontside ports and 24" LED ports

I created a bootable volume on a USB2 100GB drive and wanted to check it out. I tried using the following port options
1. Backside ports on my Mac Pro (early 2009, 2.26 GHz 8-core) - DID NOT WORK
2. 24" LED ACD's ports - DID NOT WORK
3. Frontside ports - ALL WORKED
Options 1 and 2 using Power-up + Option key pressed displayed the USB bootable disk/volume but system would not boot from it.
Option 3 using Power-up + Option key pressed displayed the USB bootable disk/volume and system DID boot from it.
Questions.
1. Are the backside ports on a hub ?
2. The 24" LED ACD's ports I know are on a hub, right ?
3. I assume the fronside ports are not on a hub
4. This means can boot ONLY is USB connected to a non USB hub, right ?

Yes, I mean that the rear ports are not on a hub. There's a USB bus for the front and rear ports. Each port is supposed to provide a maximum of 500 mAs of current to a single connected device. The total power suppled is supposed to be 15 watts on the front, and the same on the rear. A full-sized (3.5") drive system cannot be bus powered as the power requirements exceed that of the bus, but a notebook drive system should be OK as their power consumption is typically less than what the bus can supply.
The only USB hub on a stock Mac Pro is the standard keyboard's two USB ports. That is why you are instructed to connect the keyboard directly to a rear port. External drives should not be connected to an external USB hub unless the hub is separately powered.

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FYI..
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OK, thanks
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Dear all,
I am reading around to see the differences between uplink ports and normal ethernet ports. It seems to be uplink port just reverse the rx,tx pins and remove the needs of using a crossover cable.
I have done a simple representation of using the below (normal ethernet ports)
PC
SWITCH
ROUTER
RX
straight
TX
straight
RX
RX
straight
TX
straight
RX
TX
straight
RX
straight
TX
TX
straight
RX
straight
TX
I assumed that the SWITCH ethernet port pins are naturally arranged as opposite from the PC so that a straight cable can be used and the same applies to a router port.
Q1) Hence from PC to Router ethernet port, I will need a cross cable, am I right ?
============================================================
Then I chance upon this website http://duxcw.com/faq/network/uplink.htm which states "A PC can be connected to an uplink port with a crossover cable"
As per my assumption above, a router has normal ethernet ports and uplink ports (for connecting to the wan/modem), since the normal ethernet ports of a router are in the order of (RX,RX,TX,TX) as shown above, I assumed the uplink port is (TX,TX,RX,RX).
PC
ROUTER normal ethernet port
PC
ROUTER uplink port
RX
cross
RX
RX
straight
TX
RX
cross
RX
RX
straight
TX
TX
cross
TX
TX
straight
RX
TX
cross
TX
TX
straight
RX
Q2) So how can the PC connect to the Router's Uplink port using a crossover cable ? Shouldn't it be using straight cable instead if it is trying to connect to a router's uplink port ?
============================================================
Q3) Where connecting switches (switch 1 to swtich2) using uplink port, can I say that a straight cable will be connected to switch 1 uplink port on 1 end, and a normal ethernet port in switch 2 on another end ?
SWITCH#1 ethernet port
SWITCH#1 Uplink port
SWITCH#2 ethernet port
TX
RX
straight
TX
TX
RX
straight
TX
RX
TX
straight
RX
RX
TX
straight
RX
============================================================
Q4) What is the purpose of an SFP port in a switch ? is it use as an uplink port ? Where does it actually uplink/connect to ?
Q5) If i connect a switch Uplink port to another switch Uplink port, does it means that I have to use a crossover cable ? does SFP fiber come with "crossover" type too ?
============================================================
Q6) If an uplink port in a switch is use to connect to a router (can we?), do i need to use a crossover cable then ? since a normal switch ethernet port will use a straight cable to connect to a router port ? as shown below
SWITCH
ROUTER
SWITCH UPLINK
ROUTER
TX
straight
RX
RX
cross
RX
TX
straight
RX
RX
cross
RX
RX
straight
TX
TX
cross
TX
RX
straight
TX
TX
cross
TX
============================================================
Q7) Last but not least, if a design connect two switches using SFP uplink ports on both side, what would be the main purpose ? to increase the amount of ports ? Why not stack them then ?
Sorry for the lengthy post, will really appreciate if some gurus can shed some light on the above.
Thanks a million.
Regards,
Noob

Hi Noob,
On some kit like netgear hubs etc, you may find a little button or
slider switch which may be labelled MDI or MDI(X) this allows a
straight cable to be used between 2 Hubs or switches (Both DCEs).
Some Cisco switches/routers will allow you to do the same but in software
interface fastethernet 1/0/1
mdix auto
====================================
DTE devices like say your laptop PC NIC card has an MDI (Medium Dependant Interface).
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RJ45 PIN
1 -- TRANSMIT +ve
2 -- TRANSMIT -ve
3 -- RECEIVE +ve
6 -- RECEIVE -ve
DCE devices like hubs & swiches have MDI-X (Medium Dependant Interface - Crossedover).
Physically this wires out as ( For 10/100M):-
RJ45 PIN
1 -- RECEIVE +ve
2 -- RECEIVE -ve
3 -- TRANSMIT +ve
6 -- TRANSMIT -ve
So lets connect the device together with a STRAIGHT cable ( Function DTE to DCE)
PC/NIC = DTE = MDI                                SWITCH = DCE = MDI(X)
RJ45 PIN                                           RJ45 PIN
1 -- TRANSMIT +ve -------------------------------- 1 -- RECEIVE +ve
2 -- TRANSMIT -ve -------------------------------- 2 -- RECEIVE -ve
3 -- RECEIVE +ve --------------------------------- 3 -- TRANSMIT +ve
6 -- RECEIVE -ve --------------------------------- 6 -- TRANSMIT -ve
So we transmit from the DTE and receive on the DCE and vice versa (BINGO).
Remember Routers are regarded as DTEs
=================================
So lets connect 2 switches together with a CROSSOVER cable ( Function DCE to DCE)
UPLINK to UPLINK
SWITCH = DCE = MDI(X)                           SWITCH = DCE = MDI(X)
RJ45 PIN                                           RJ45 PIN
1 -- RECEIVE +ve -------------------------------- 3 -- TRANSMIT +ve
2 -- RECEIVE -ve --------------------------------- 6 -- TRANSMIT -ve
3 -- TRANSMIT +ve ------------------------------ 1 -- RECEIVE +ve
6 -- TRANSMIT -ve ------------------------------- 2 -- RECEIVE -ve
So we transmit from the DCE and receive on the DCE and vice versa (BINGO).
Regards
Alex

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System: 2 T500s, both manufactured early April 2009, win XP, ATI Radeon 3650 graphics,4GB RAM, latest Lenovo drivers installed..
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T.P.

This won't work. Pins 2 and 3 are for sending data (2 is transmit, and 3 is receive.) You would be much better off using pins 5 (9-pin connector) or 7 (25-pin connector) for GROUND and then using DTR (pin 4 on 9-pin and pin 20 on 25-pin) as your signal. This will give you a 12V difference between the pins - you'll need a resister in series with the LED as well (from memory, LEDs aren't very happy with 12V over them for long.)
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Difference between console port and dedicated management port

Can someone explain what the difference is between the console port and the dedicated management port(fa0) , on a Cisco 2960s switch.
Thank You.

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A console port is special for two reasons. First, it's "known" to the system as its console port which means the system will send status information to it, and often treat it special when accepting input. Second, the console port is generally wired as a serial port. (It also normally doesn't have an IP address.)
The console port was intended for where the system operator controls the system from, usually nearby (physically). (Console ports are/were used for any computer based system.)
Management ports are generally for remote management using an Ethernet port. On older switches/routers, a device might be configured to use an ordinary Ethernet port for this purpose. On newer switches/routers, a Ethernet port is provided for this purpose. For these, the device may actually use different hardware for port and might treat it internally differently. For example, often the Ethernet management port is only FE, it may not have ASIC support for high speed switching, and it might be in it's own predefined VRF. Generally, a management port will have an IP address, but different from IP address spaces used by other hosts.
Out-of-the-box, a console port will allow you to configure the device, but a management port will often require some additional configuration.

Booting from a USB2 using backside/frontside ports and 24" LED ports

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