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

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

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  • 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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  • 76 Answers

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"

Posted on Aug 21, 2007

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1 Answer

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

Sep 25, 2016 | Cars & Trucks

1 Answer

How do u remove hubs on a 1992 Isuzu big horn


TO DO WHAT? not even the smallest hint on job or failure.>?
USA?
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....


names
Acura SLX
Chevrolet Trooper
Isuzu Bighorn
Holden Jackaroo
Holden Monterey
Honda Horizon
HSV Jackaroo
Opel Monterey
Subaru Bighorn
Vauxhall Monterey
wow......
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... (alldata.com covers this)

Dec 13, 2015 | Isuzu Cars & Trucks

1 Answer

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

Dec 07, 2012 | 1993 GMC Suburban

1 Answer

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

May 14, 2012 | 2006 Buick Terraza

1 Answer

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.

May 06, 2011 | Dynex 4-Port 10 Mbps Ethernet Hub

1 Answer

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:
    • Front wheels
    • Halfshaft hub nut
    • Caliper from the steering knuckle WARNING
      DO NOT allow the brake hose to support the weight of the caliper.
    • Brake rotor
    • Anti-lock Brake System (ABS) sensor from the backing plate
    • Hub and bearing assembly from the backing plate
    • 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:
    • Hub and bearing assembly onto the halfshaft
    • Hub and bearing assembly to the backing plate. Torque the 3 bolts alternately and evenly to 70 ft. lbs. (95 Nm).
    • ABS sensor
    • Brake rotor
    • Caliper on the steering knuckle.
    • Halfshaft nut. Torque it to 118 ft. lbs. (160 Nm).
    • Front wheel. Torque the nuts to 100 ft. lbs. (140 Nm).

Oct 18, 2010 | 2001 Oldsmobile Aurora

1 Answer

I need to remove the front brake rotors from my 94 Isuzu trooper to either turn or replace them. Is this a complex project requiring special tools to remove or re-install due to the auto 4wd hubs? I have...


No, but I would replace the rotors. Turning them usually winds up getting them warped as soon as they heat up and/or you hit a puddle of water..also, you will need a torque wrench and standard automotive tools, Jack and stands and a vice..

1 Place the Transfer shift in the 2H position.
Raise and support the front of the vehicle safely on jackstands.
2 Remove the wheel and tire assembly.
3 Loosen the hub to rotor retainer bolts.
4 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. 5 Secure the caliper out of the way with the flexible line still connected.

Once the hub/rotor is removed from the vehicle the wheel bearings may be cleaned and repacked or the bearings and races may be replaced. For more information, please refer to the wheel bearing procedures in General Information & Maintenance of this manual.

6 Remove the hub nut using hub wrench J-29020-A or equivalent.
7 Remove the hub cap assembly retainer bolts.
8 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.
9 Once the hub/rotor is removed, remove the retainer bolts securing the rotor and hub together. Inspect the hub and replace if needed.

To install:
1 With the rotor secured in a vise, attach the wheel hub to the rotor using the retainer bolts. Tighten the bolts to 47-58 ft. lbs. (61-75 Nm). Apply 2.12 oz. (60 gm) of grease to the hub before installing.
2 Carefully install the wheel hub/rotor over the spindle.
3 Install the bearings washers and other components. 4 Position the lock washer so the hub cap assembly bolt holes line up properly.
5 Install the spindle washer and nut and secure using hub wrench J-29020-A or equivalent. Preload the bearing to 3.31 lbs. (1.5 kg).
6 Install the inner cam and any shims. Install the hub cap assembly and secure in place with retainer bolts. 7 Tighten grade M8 bolts to 17-22 ft. lbs. (22-29 Nm), tighten grade M10 bolts to 40-47 ft. lbs. (52-61 Nm).
8 Install the brake caliper.
9 Install the tire and wheel assembly.
10 Remove the supports and carefully lower the vehicle.

Jan 07, 2018 | Isuzu Trooper Cars & Trucks

1 Answer

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).
      1. Install the wheel bearing/hub. Caution: These fasteners MUST be replaced with new fasteners anytime they become loose or are removed. Failure to replace these fasteners after they become loose or are removed may cause loss of vehicle control and personal injury. Notice: Refer to Fastener Notice in Service Precautions.
      2. Install the NEW wheel bearing/hub bolts.
      1. Install the brake drum.
      2. Install the tire and wheel.
      3. Lower the vehicle.

Nov 07, 2009 | 2005 Chevrolet Venture

2 Answers

Changed the battteries and mouse and keyboard. Now can't get keyboard to work.


There is a central antennae that hooks directly to the computer via USB plug...on that central hub is a button, this is a component connect button, push the button on the antennae first and as it is blinking, push the connect button on the keyboard, it may be green in color and you may need an ink pen to depress it....just make sure that you depress it while the other unit is still blinking. This will connect the component to the hub. If you follow the procedure and it does not immediately connect, reboot and perform the procedure again.....try to move the hub to another usb port before you power back up.

Aug 31, 2009 | Logitech Internet Pro Keyboard

2 Answers

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.

Jan 08, 2008 | 3Com HomeConnect (3C19261) 5x10/100 Mbps...

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