Motorola T193, Service Manual

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6881038B70 July 27, 2001 7
Level III Service Manual Product Overview
Product Overview
Motorola PF B95 and C21 mobile telephones feature global system for mobile
communications (GSM) air interface, general packet radio service (GPRS) transport
technology, and wireless application protocol (WAP) Internet browser. PF B95 and
C21 incorporate a simplified icon and list-based user interface (UI) for easier
operation, allow short message service (SMS) text messaging, and include clock,
alarm, datebook, calculator, and caller profiling personal management tools. The
PF B95 is a dual band phone that allows roaming within the GSM 900 MHz and
digital cellular system (DCS) 1800 MHz bands. The PF C21 is a single band phone
operating in the personal communications services (PCS) 1900 MHz band.
PF B95 and C21 telephones support GPRS and SMS in addition to traditional circuit
switched transport technologies. GPRS, where available, provides substantial
increases in mobile data communications performance and the efficient use of radio
spectrum. Data transmission rates for GSM networks can potentially increase from
the current rate of 9.6 kbps up to a theoretical maximum of 171.2 kbps. An increased
data rate is by no means the only benefit provided by GPRS. A key advantage is
the provision of a permanent virtual connection to the network. This “always on”
connection is possible because GPRS uses packet data transfer so that, for example,
email can be downloaded in “background mode.” There is no need for the user to re-
connect before requesting a service, eliminating connection set-up delays and
adding convenience and immediacy to data services access. The “virtual” nature of
this connection means that network resources are not consumed during periods
when a user is not actually sending or receiving data.
The telephones are made of polycarbonate plastic. The display and speaker, as well
as the 16-key keypad, transceiver printed circuit board (PCB), microphone, charger
and headphone connectors, and power button are contained within the J form-factor
housing. The user-replaceable 600 mAh nickel metal hydride (NiMH) battery
provides up to 300 minutes of talk time with up to 180 hours of standby time
1
. The
phone accepts 3V mini subscriber identity module (SIM) cards which fit into the
SIM holder underneath the battery. These telephones feature a 96 x 64 pixel 800
square millimeter high-resolution graphics display and an internal antenna.
Features
PF B95 and C21 telephones use advanced, self-contained, sealed, custom integrated
circuits to perform the complex functions required for GSM GPRS communication.
Aside from the space and weight advantage, microcircuits enhance basic reliability,
simplify maintenance, and provide a wide variety of operational functions.
Features available in this family of telephones include:
• Lower voltage technology that provides increased standby and talk times
• Extended GSM (EGSM) channels (PF B95 only)
• Tri-coder/decoder (CODEC) that allows full rate, half rate, and enhanced full
rate modes of transmission
• Supports SMS, concatenated SMS, and cell broadcast messages
2
• Supports GPRS, circuit switched, and SMS networks
2
• WAP 1.1 compliant
2
1. All talk and standby times are approximate and depend on network configuration, signal strength, and features selected. Standby
times are quoted as a range from DRX=2 to DRX=9. Talk times are quoted as a range from DTX off to DTX on.
2. Network, subscription and SIM card or service provider dependent feature. Not available in all areas.