Installation
2.4
59
The GSM / UMTS signal is low. We recommend the minimum signal level
of approximately -80dBm. If lower, you have to change the antenna or
gateway location!
The GSM / UMTS cell (BTS) to which the wireless module is trying to log in
is overloaded. If you use directional antennas, you can direct them to
more GSM cells than one. The possibility to choose a cell by antenna
directing is considerably limited or eliminated in towns or densely
populated areas where multiple signal reflections occur. It is also difficult
to select a cell where the cells lie in a straight line before and behind the
antenna. If no selection can be made, you have to use another available
GSM / UMTS provider.
Caution
You are recommended to use 32 channels at most on one installation site
for one GSM / UMTS provider to avoid wireless network overload problems
on the installation site.
Some wireless modules are permanently logged-out from the network or fail
to receive incoming calls:
The problem indicates a wireless network overload due to heavy traffic.
You can eliminate this problem by setting the
GSM basic parameters -
Call delay
parameter in the configuration tool to „2 seconds‟. This
parameter extends the delay between the end of one call and the start of
another call made via one and the same wireless module.
Some wireless modules cannot log in to the wireless network even after reset:
Your GSM / UMTS provider may have located the SIM card, but refused
the login to the wireless network because either too many calls are being
made using this card, or the SIM card has been logged-in to one BTS for
too long. This problem can be solved by an occasional exchange of SIM
cards between wireless modules.
The manufacturer cannot be held responsible for any SIM card or service
blocking problems of the GSM / UMTS provider caused by the GSM /
UMTS provider‟s breach of a SIM card term agreement.
Mounting
2N recommends installing the gateway in a well ventilated area (rack) according to
the installation conditions. The 2N® StarGate and BlueStar gateways are designed for
rack installation with the minimum rack depth of 400mm and 3U (132mm). 2N®
BlueTower is to be installed into a rack shelf.
To prevent gateway overheating, you are recommended to install the gateway into a
rack with 1U free and uncovered space above and below the gateway (see the figures
below):
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