vzw network extender

Posted on 2012-08-16
Last Modified: 2012-08-17
I installed the network extender on our network and no matter what I try I cannot receive a GPS signal onthe device. It does have an internal IP address, I verified that by finding the MAC address in the DHCP database. I am able to ping the device but cannot log into to view\change any settings if needed. I then logged into it directly from my laptop using VZW instructions and ethernet cable and trying to accesss it using and I receive no logon page but "Error 403 - File is protected".
When connected to the internal network the power and WAN LED are solid blue which means functioning properly. The GPS LED is a solid magenta which means not functioning and the SYS LED is blinking red which means trying to search for a GPS signal.
I have the ports open on the firewall that the document mentions (UDP 500, 4500 and 52428) and still nothing. There is traffic on the ports except for 52428, which is the one GPS uses for synching. I can also ping the external IP addresses it requires to contact successsfully from internally.
I brang the device home and it worked fine. I'm pretty sure that I have done everything I could to try to get it to work. I can only think that the thick windows we use are possibly blocking the GPS signal. VZW support is no help at all.

Any ideas? Thanks.
Question by:tolinrome
    LVL 77

    Expert Comment

    by:David Johnson, CD, MVP
    Try putting the network extender in/or very close to the window. The signal is probably being blocked
    LVL 39

    Expert Comment

    GPS is a very week signal. A solid brick wall can block the signals, let alone some concrete walls with rebar in it.   Also check you don't have windows with metal on them, [ heat blocking, sun blocking ].

    You may need to get an external antenna
    LVL 7

    Author Comment

    I even brang the signal outside about 10 feet behind the building and still no signal while the gps on my iphone was fine.
    LVL 39

    Accepted Solution

    Phones use multiple methods to lock onto the signal.
    Using the network ID etc. they can guess a rough spot on the earth [ several square km ] where you are, using the time from the phone [ & network ] they can draw a picture of what they SHOULD see as satelite constellation at that time & place and verify if it is there.
    [ that can be done in a few seconds. ]. i.e. You have a "fix of" or are "locked onto" the GPS signal.

    ANY GPS receiver can use the following method.
    If that is not the case then the receiver will start to listen for satellite signals by channel hopping, until it get's a satellite signal, when it has three to four satellites it can compute the place in space where you are and follow on to keep track using short checks.
    [ using the previously known position possibly updated with previously established
    motion information ].
    This way it may take several minutes to get a "fix" or "lock"

    Note that the satellites are really fast moving atomic clocks [ in orbit roughly 20000 km above the earth ] just telling the time ( and possibly lie a few ms about it, to give some inaccuracy for civilian use ). Also the bitrate used is rather low. If you need to read the FULL message in stead of just headers then it can take more than 12 minutes to receive the full message [ per satellite ].

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