Newsgroup: it.tlc.cellulari
Titolo: Ericsson 688 secrets

Possibile che il 688 non abbia nulla di segreto oltre la visualizzazione
dell'imei, della versione software e del Blocco Rete? Nulla tipo le "ENG
FIELD OPTIONS" dei vari motorola?
Grazie per la risposta
-- 
Alex
e-mail: 
wo...@geocities.com

Giovanni Salti wrote:
I didn't see this was a crosspost. This is a brief summary in english:
Ericsson phones have a technical menu equivalent to Motorola's Eng
Field: this menu is called CHANNEL and shows:
RxLev (level of the signal: minimum -110 dBm = 0 RxLev)
RxQual (quality of the signal: bit error rate graded from 0 to 7: best 0
worst 7)
TA (time advance: one unit = 511 meters from the base station)
TxPwr (transmission power of the mobile station in dBm)
TS (time slot used in the conversation)
BCCH (Broadcast control channel used: number of the radio signal from
the cell, Idle mode)
TCH (traffic channel: number of the radio signal, in conversation)
SDCCH (stand-alone dedicated control channel, used when connecting to
the radio station: first moments of transmission or reception)
 
The channel menu can't be activated from the phone and an interface
(RS232) is needed to connect the phone to a computer.
Once active, the CHANNEL menu is a submenu of the SETTINGS menu.
Ciao
Giovanni

Channel Monitor (RBS)
=====================
If the Channel Monitor menu has been enabled, it will appear as the last
menu item (Channel) in the Settings menu. It can either be turned on or
off. If turned on, the usual cellphone display is changed to display two
rows of channel information instead of the name of the current network.
(The time is still displayed in the third row, as are the receive signal
strength and battery level indicators, as usual.) The two rows are
divided into six areas as follows:
1	2	3
4	5	6
1 Channel - Indicates one of three logical GSM channel types currently
in use, and the channel number xxx from 1 to 124, as follows:
· Bxxx represents a Broadcast Channel when the cellphone is idle.
· Sxxx represents a Stand Alone Dedicated Control Channel (SDCCH) when a
call is being set up.
· Txxx represents a Traffic Channel when the call is in progress.
2 RXLEV - Indicates the Receive (Rx) Level from 0 to 63. RXLEV indicates
how good the reception is at a given moment. 0 represents a signal
strength of -100.5dBm while 63 represents a signal strength of
approximately -37.5dBm. Rx Level is measured in dBm in such a way that
the incoming signal strength equals approximately (-100.5 + RXLEV)dBm
(+/- 0.5dBm).
3 TXLEV - The output Transmit Level in dBm (displays -- when cellphone
is idle).
4 Timeslot - Indicates the current timeslot (0 when cellphone is idle).
5 RXQUAL - Indicates the Rx Quality or BER (Bit Error Rate) from 0 to 7,
which is a measurement of the amount of error correction required while
talking. 0 indicates less than 0.2% and as the number rises one will
hear more pings and pops in the speech since large parts of the data
frame are missing. At a level of 5 one is likely to lose the connection.
At a level of 6 half a burst has been lost. The BER can be determined as
follows:
RXQUAL	BER (%)
0	BER < 0.2
1	0.2 < BER < 0.4
2	0.4 < BER < 0.8
3	0.8 < BER < 1.6
4	1.6 < BER < 3.2
5	3.2 < BER < 6.4
6	6.4 < BER < 12.8
7	BER > 12.8
6 Timing Advance - To ensure the MS burst arrives at the BS at the
correct time within the allocated timeslot, the BS tells the MS to send
its data somewhat in advance. The TA is directly proportional to the
distance from the MS to the BS and is measured in half-bits from 0 to
63. The actual distance to the BS can therefore be calculated from the
TA such that d = 1.11*TA/2 km. The TA therefore gives the distance to
the BS in steps of 555m from 0 to the theoretical maximum of 35km.