Nokia NSB-7 Series, Руководство по обслуживанию

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NSB-7
System Module PAMS Technical Documentation
Page 6 ã Nokia Mobile Phones Ltd. Issue 1 06/00
Transceiver NSB-7
Introduction
The NSB-7 is a single band transceiver unit designed for the GSM1900 networks. It is
GSM1900 power class 1 (1W) transceiver.
The transceiver consists of System/RF module (RB9), Display module (UX7) and assembly
parts.
The transceiver has a full graphic display and the user interface is based on a jack style
UI with two soft keys.
A back mounted antenna is used, there is no connection to an external antenna.
The transceiver has a low leakage tolerant earpiece and an omnidirectional microphone,
providing excellent audio quality. The transceiver supports full rate, an enhanced full rate
and a half rate speech decoding.
An integrated IR link provides a connection between two NSB-7 transceivers or a trans-
ceiver and a PC (internal data), or a transceiver and a printer.
The small SIM (Subscriber Identity Module) card is located under the back cover of the
phone.
Operational Modes
There are five different operational modes:
• power off mode
• idle mode
• active mode
• charge mode
• local mode
In the power off mode only the circuits needed for power up are supplied.
In the idle mode circuits are powered down and only the sleep clock is running.
In the active mode all the circuits are supplied with power although some parts might be
in idle state part of the time.
The charge mode is effective in parallel with all previous modes. The charge mode itself
consists of two different states, i.e. the fast charge and the maintenance mode.