2N StarGate/BlueTower v5.5 - Manual (Page 54)

54
2N TELEKOMUNIKACE a.s., www.2n.cz
®
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
parameter in the web interface to '2 seconds'. This parameter delay
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.
DTMF transmission is not correct. Some numbers are not correctly
recognized by called/calling party:
DTMF tones (as all voice services) change codec during transfer to
GSM/UMTS network voice channel (this codec change caused partially
information lost which depends on used type of GSM/UMTS codec in
wireless part of the network). To improve success rate of transferred tones,
please check audio quality / level of called + calling party ; audio settings
of opposite party; change source of DTMF tones (different length and
volume can improve probability of successful DTMF transmission) or use
DTMF transfer not in voice channel, but in signaling channel (regarding RFC
XXXX). Refer to the
subsection Gateway Control - GSM Basic Parameters
for small changes in audio levels.
Mounting
2N recommends installing the gateway in a well ventilated area (rack) according to the
installation conditions. The
gateway is designed for rack installation 2N StarGate
®
with the minimum rack depth of 400mm and 3U (132mm). is to be 2N BlueTower
®
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):
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.
Note
Settings of GSM network and opposite called/calling party can involve
DTMF transfer. 2N cannot guarantee successful DTMF transmission with
using 2N GSM/UMTS gateway with PRI ISDN interface (where only voice
channel transport of DTMF is allowed).