How to recover from a dead 5100/5200 modem
Link original: http://www.broadbandreports.com/forum/remark,11083613~mode=flat
This document applies to models E141 and E240,
but should work for other models as well.
First of all, you will need to open your modem. There is one screw located under
the label on the bottom of the unit, it is located about mid-center of the top
of the label, between the Efficient logo and the word Speedstream. You can find
it by applying slight pressure to the label around that location and see where
the label starts to push in. Break through the label at this point to gain
access to the screw. Once the screw is removed, you must unclip the top and
bottom plastic housing of the modem. This can be a bit tough in some instances,
but if you push in around the bottom half of the housing, while prying out the
top half a bit, the housing should pop apart into two separate pieces. Try your
best to work around the case from side to side until both halves are separated,
and you have access to the board inside.
The second step, is to build the serial port that you will be connecting to the
modem at location J5. This is the empty five hole connector you will see on the
board. On both the 5100 and 5200 (models E141 and E240), J5 is located towards
the back of the modem, semi-near the DSL/RJ11 port. Follow these links to see
different methods of creating the serial port connector:
»Adding
serial to SS 5200 or recovery alternative?
»www.compsys1.com/workbench/On_top_of_t..
Once the serial port connector is wired to the modem, connect a serial/rs232
cable between the modem and PC. Open a terminal session of your choice
(Hyperterm, Teraterm, etc.). Set the port to 115,200Bps, 8Bits, No parity, 1
stop, and No flow control. Then power up the modem. You should see the modem's
POST messages appear on the screen. If not, check your serial connection to make
sure it's wired properly.
At this point, the terminal screen will display one of two modes.
Mode 1) The terminal screen will display a Project X-MIPS logo and stop,
prompting you to enter the modem's MAC Address. If this is the case, type in the
MAC address of the modem (located on the label underneath) and press enter. Do
not use dashes or colons in the address, just type all 12 characters in
succession. Case does not matter. If you type a character it doesn't like, or
too short of an address, you will get a parse error, and it will prompt you
again. Be careful though, as you can actually give yourself a different MAC
address than the one that was originally assigned to the modem.
If your modem's power light had been stuck on red, you will immediately see it
change to green. The modem will run through it's boot process again, and will
have loaded the modem's default configuration. This will put the modem into the
state it was in when you first received it. At this point the modem is fully
functional, and any firmware can be reloaded through the ethernet port as usual.
You may disconnect your serial connection and screw the housing back together.
Mode 2) The The terminal screen will display a Project X-MIPS logo and reload in
an endless loop. At this point, you will need to do something different. You
will need to wait until you see this (or similar to):
Loader Starting...
FLASH: AMD Am29LV160B (Bottom Boot)
The display should stop at this point for a few moments, until looping through
the post screens again. While the display is stopped at this point, start
holding down a key until you start seeing boot> prompts. This may take a
while, and the screen may loop a few times before you see this. If successful,
you should see something resembling this:
boot> gotta 20
At this point, hold down the shift key and press the plus/equals key. This is
important! If you do not do this step, the modem will not stop looping through
the boot process. You will receive a message stating:
Whacking NVRAM...
Back at the boot> prompt, press the R key.
Follow the instructions for recovering from Mode 1 above.
Disclaimer: Efficient Networks/Siemens does not support this procedure. Please
attempt this at your own risk. Be aware that if you attempt this, you will most
likely void any warranty that you have on the modem.
Re: How to recover from a dead 5100/5200 modem.
Waiting for MAC |
Breaking into boot> |
Whacking NVRAM |
Here are some of the screens you will see
during the recovery procedure.
First Screen |
Looping |
MAX3222 |
3V A232DBH |
JP5 Wide |
Diagram |
JP5 Close |
Here are a few pics of how I set up my serial
connection.
The first few pictures are using the MAX3222CDWR (part# 296-13083-1-ND) chip
from Digi-Key, and how it was wired up. I don't have very steady hands, so I
bent every other pin up, so I wouldn't solder any two together. Also used,
were five 0.1uf Ceramic capacitors, and some very thin wire. The tape is only
there so I could remember what wire went where
The last few pictures are using the 3V version of part A232DBH from »www.compsys1.com/workbench/On_top_of_t..
Normally, this comes in a 5V version, so you need to specify the 3V when
ordering. You will need to assemble the hood, and solder on 4 wires, but it's
a lot easier than making the whole thing from scratch. Much cleaner as well.
Both methods work great.
The 3V A232DBH is a nice choice because it can be put together very easily, is
enclosed, and is a much cleaner. Though the cost is around $20.
If your adventurous, and want to build your own circuit, that's fine too. If
you have the tools, you can build it pretty cheaply. It just takes a bit of
patience, but the satisfaction of putting it together yourself, and seeing it
work, is a great feeling.
Se você chegou até aqui, é porque está
interessado...
Assim, vale a pena acessar Configurações
avançadas via console
A página é para o Broadxent, mas as dicas de
hardware valem...
|
