Matrix Telecom SARVAM UMG System Manual page 294

• A new window opens. In Enter Recharge PIN Number, enter the number printed on the Recharge
Voucher.
• Click OK.
• The response received from the mobile network (including possible error messages) will be displayed
under USSD-Reply.
BCCH Locking
In the GSM network, each BTS is assigned one particular channel called as ARFCN (Absolute Radio Frequency
Channel Number), which is transmitted by BTS in BCCH (Broadcast Control Channel).
Now, when SARVAM UMG is switched on, the Mobile Port gets registered with the network on a particular BTS
which has the highest signal strength. However, the signal strength is not consistent. It keeps fluctuating, resulting
in call drop or poor voice quality.
SARVAM UMG enables you to lock the Mobile Port to a particular cell or channel or BTS (Base Transceiver
Station) for various reasons such as:
• better network availability
• minimum call drop due to bad signal/ network failure, etc.
• To use this feature, make sure GSM or LTE is selected as the Preferred Network Mode of the Mobile
Port.
• BCCH Locking will not be supported if Quectel UC20 (3G module) is installed in your system.
To select the BCCH Locking Mode for the Mobile Port,
• Click BCCH Locking to expand.
• By default, the port is Auto Locked with the Main Cell which has the highest signal strength.
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