Power Supply Indicator - Siemens M20 Terminal Technical Description

Siemens Information and Communication Products
6.5.17 Network selection
Automatic selection (default setting):
A network is automatically selected on insertion of the SIM card and when the M20 is activated.
Manual selection:
All possible network operators can be shown on the display by using the code *01763*11#. The keys <+> and <-> (or
<Cursor up>) are used to scroll up and down the list. The network operator is selected with the <send> key. The user is
informed via the display (error message) if he/she cannot log on to this PLMN. The call processing status M20 is displayed
when the telephone is idle (service indicator).
6.5.18 SIM lock
If the SIM card is protected by a 4-digit PIN, this must be entered via the keyboard each time after inserting the card. Emer-
gency calls can be made without the SIM card or without entering the PIN.
i.e. the user must enter the PIN at the terminal in the following situations:
• after switching on the power (i.e. when power returns after a power failure)
• after inserting a SIM card
6.5.19 RSSI
The field strength is indicated by a bar on the left-hand side of the display.
Four different levels can be shown:
• strong signal (3 segments)
• signal OK (2 segments)
• low powered signal (1 segment)
• no signal (flashing antenna symbol)
6.5.20 Ringer volume setting
The idle telephone (handset is on hook) can be switched to programming mode by holding down the <+> or <-> key. This
generates a ring tone. Every time <+> or <-> is pressed, the volume is increased or decreased in stages (for the default
value and value range see
Value ranges
6.5.21 Language volume setting
The volume can be changed by pressing <+> or <-> during a call. Every time <+> or <-> is pressed, the volume is
increased or decreased in stages (for default value and value range see
of the call.
6.6

Power supply indicator

In the event of a power failure, power supply can be switched to battery operation by means of an external hardware de-
vice.
The type of power supply and the battery status can be checked on the 'supply status' hardware indicator. See also Chapter
4.3.9 "Power supply indicator" on page 24
Version 8 dated 15.03.00
). The setting is stored until the SIM card is reset.
.
Man Machine Interface
). The setting is stored for the duration
Value ranges
A
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