Allied Telesyn CentreCOM MR820TR (AT-MR820TR-15A) Networking Hub Logo

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Posted on Aug 19, 2007
Answered by a Fixya Expert

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HUB failure I can't get a connection from my hub to my components

  • knownobounds Jan 28, 2009

    My wireless router works from this hub, however, none of the 1-7 ports
    work with any computer directly wired in. Is there some protocol
    or other set up required to use this hub?


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  • Expert 76 Answers
  • Posted on Aug 21, 2007
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Joined: Aug 18, 2007

Are you using the 10Base2 coax outlet, the AIU port or the 8port 10BaseT outlets? Also are you using port #8 which is an uplink port and not meant to be connected to another computer? This hub, although rather old, has auto MDI/MDI-X which can accept either straight or cross-over cabling on ports 1-7 and a switchable port #8. Just make sure your cables are pinned correctly. Otherwise, hubs are meant to JUST work. Although this particular hub MAY prevent/hinder DHCP requests (it does prevent DHCP type Boot LAN requests), which means you might want to try connecting between two computers who have a static IP address and are on the same subnet. ZT3000 "Beta tester of "0"s and "1's"

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Related Questions:


I've got a 2010 chevy equinox and the abs and traction control lights are on. When I start the engine and try to drive the front wheel brakes sound like they are locked until you hear a ding sound.

check and test fuses and connections --check hub brakes and abs sensor for failure the sensor is incorporated into the hub so if hub failing can cause abs and traction control trouble lights

ABS light coming on stays on ABS wants to fight against the manual until the manual takes over but the lights stay on could that have anything to do service TPM light

didnt specify vehicle --generic answer--check fuses and relays -service pm is a tire pressure sensor system not your braking system ---for the abs have vehicle scanned for trouble code most auto stores offer this service for free ----check the abs sensor wiring and connections they are the wiring connection that runs behind the wheel they can get damaged by debris or age ---check hub/wheel bearing for wear if hub needs replacement abs is incorporated into hub so if hub failure abs can fail also

How do u remove hubs on a 1992 Isuzu big horn

TO DO WHAT? not even the smallest hint on job or failure.>?
hubs, the rears have hubs to with disc brake option.rotor hubs.
I guess front hubs?.
guess 2, wheel bearing hubs, and not 4wd axle locking hub units.
doing what?
brakes, wheel bearings, axle damage. 4wd axle bearings what?
the pages are 2wd pages, and 4 wd pages, which is yours?
is this your first time DIY ever. ? or first time 4wd?
guess 3, 4wd, how am I guessing....

Acura SLX
Chevrolet Trooper
Isuzu Bighorn
Holden Jackaroo
Holden Monterey
Honda Horizon
HSV Jackaroo
Opel Monterey
Subaru Bighorn
Vauxhall Monterey
our usa book lists it as trooper only.
so ...

just B or B then A off? if you had b off, you'd see what?, a big nut.
that is locked to spindle shaft.
ill guess? wheel bearings are bad? (just in hub not spindle bearings bad... no matter this is first.)
so you do what. ? here are the steps.

that part"B" must be off first, see the bolts holding it, ?
B = auto locking hubs. or hub axle lockers.
26005769-b5pjo3cin0lhc1b54v4xlnuy-4-0.jpg you can see the caliber must come off, so, do so and tie them up.
  1. "Place the Transfer shift in the 2H position.
  2. Raise and support the front of the vehicle safely on jackstands. (rear tires chocked, and hand brake set hard)
  3. Remove the wheel and tire assembly.
  4. Loosen the hub to rotor retainer bolts.
  5. Remove the brake caliper mounting bolts and carefully remove the caliper (along with the brake pads) from the rotor. Do not disconnect the brake line. Secure the caliper out of the way with the flexible line still connected.
  6. Remove the hub nut using hub wrench J-29020-A or equivalent. ( special tool)
  7. Remove the hub cap assembly retainer bolts. Remove the spindle nut, washers, and other components. Remove the hub/rotor, being careful not to drop the outer wheel bearings. As the hub/rotor is pulled forward, the outer wheel bearings will often fall forward.
  8. Once the hub/rotor is removed, remove the retainer bolts securing the rotor and hub together. Inspect the hub and replace if needed."
  9. end removal. install is next... ( covers this)

Anti lock brake light stays on

gm is known for their anti-lock brake problems the most likely problem is a build up under the sensor since u have a 93 the abs sensor is incorporated into the hub cheaper to replace the hub w/sensor than to just replace the sensor the hub is not that hard to replace in the 2wd or 4wd----to clean mount jack up vehicle remove the wheel brake caliper,caliper bracket ,rotor and the abs sensor will be in view check the connection and the condition of sensor into the hub if lot of road grime or rust build up use a brush to clean area around sensor than using an allen key remove sensor careful pull straight up plug hole and clean small mounting plate replace sensor ------to replace hub do same in removing components but than need to unbolt hub from rear on 4wd also need to remove cv drive nut replace hub and done

How to replace a wheel speed sensor

if abs [also speed] sensor is damaged better off replacing hub most sensors are incorporated into the hub or are a ring style that is a press fit around the hub and still have to remove hub to replace--- larger vehicles and some cross overs u can remove just the sensor not in your case --if just wire damaged can order and replace but if abs needs to be replaced than prior to removing wheel loosen center axle nut dont remove yet jack up and support vehicle- remove wheel,brake caliper,brake bracket,rotor and center axle nut ,disconnect abs wire connection and remove the 3 bolts at rear of hub and remove hub from spindle clean area and reinstall hub careful of wire connection replace all components

I use a Dynex USB 2.0 4-Port hub in a mailing machine. I keep getting brand new hubs that quit and won't power up. Leaving all the same cables and plugging in a new hub and it powers up. I am also...

You are probably putting too much current through the hub. 1 USB port is good for 500mA, and since this splits 1 into 4, you're working with 125mA per device if you have 4 things connected. Find a powered hub instead.

Left front wheel bearing replacement diagram

Removal & Installation Front To Remove:
The front wheel bearings are not serviced separately. If the front wheel bearings are defective, the hub and bearing assembly must be replaced.
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Lubricate the threads on the halfshaft with clean engine oil.
  3. Remove or disconnect the following:
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    • Hub and bearing assembly from the halfshaft
    • Hub and bearing assembly
To Install:
Exploded view of the front hub mounting and related components 7922xg36.gif

  1. Install or connect the following:
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    • Brake rotor
    • Caliper on the steering knuckle.
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How do you remove the backing plate from an '05 Chev Venture rear hub so the hub can be replaced?

The 4 Bolts that Hold the HUB in Also Hold the Backing Plate
Hub Replacement - Rear (Front Wheel Drive/Drum)

Removal Procedure
  1. Raise and support the vehicle.
  2. Remove the tire and wheel.
  3. Remove the brake drum.
    1. Remove and DISCARD the wheel bearing/hub bolts.
    2. Remove the wheel bearing/hub.
    3. Disconnect the wheel speed sensor electrical connector (2).Installation Procedure
    4. Connect the wheel speed sensor electrical connector (2).
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Changed the battteries and mouse and keyboard. Now can't get keyboard to work.

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3 com hub tp4 home network setup failure

There are several possible problems here, and more information is needed to identify which one is causing trouble. First, are you using a high speed dsl or cable internet connection? ...or is your Internet connection a dial-up phone line? This will have a significant effect on how your cables should be connected between the hub and the computers. Windows typically defaults to a 169... address when it is not properly connected to a shared network connection.
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