Nokia Net Monitor description (DCT3)

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Test 12 – Cipher (Encryption), Hopping, DTX and IMSI status

Available in: 2100, 3330, 5110, 6150, 6210, 7110, 8210, 8250

This test shows basic information about the encryption algorithm, whether hopping is used, whether DTX (discontinuous transmission) is used as well as the IMSI-attach- detach procedure is used. This information applies to the currently registered network, or the last registered network if the phone is not currently registered to a network.

Test screen	Help screen

CIPHER: Displays the encryption algorithm used when communicating with the network. Can be “A51” (normal), “A52” (weaker), “A53” (very strong), or “OFF” (no encryption). This value is only displayed when the phone is communicating with the network, when idle this value is displayed as “OFF”.

HOPPING: Displays whether frequency hopping is being used or not, displays “ON” or “OFF”.

DTX: Displays whether DTX (Discontinuous Transmission) is being used. This is where the transmitter is shut off when the user is not speaking to save power. Displays “ON” or “OFF”.

IMSI: Displays whether the IMSI-attach-detach procedure is being used. Displays “ON” or “OFF”. This is where the phone signals to the network it is available when turned on, and also signals when it is being switched off.

This test is most useful to observe what form of encryption is being used to encrypt all data between the MS and the BTS. DTX, IMSI and hopping information are repeated elsewhere.

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WAP-gateway IP: 79.186.253.167
Port: 9201