Motorola C257 Service Manual download pdf (Page 9)

Level 1-2 Service Manual Product Overview

July 1, 2005 9

Product Overview

The Motorola C257/C261 features a global system for mobile communications wireless

interface and general packet radio service (GPRS) transport technology. It also features a

simplified icon and graphical user interface (UI) for easier operation in addition to short

message service text messaging (SMS), speed dialing, quick dialing, an alarm, a calculator,

games, and an address book. The C257/C261 is a dual-band phone that allows for roaming

within the EGSM900 / DCS1800 or GSM850 / PCS 1900.

C257/C261 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

reconnect 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 with a metal enclosure. The display and

speaker, as well as the 17-key keypad, transceiver printed circuit board (PCB), microphone,

charger and headphone connectors, and power button are contained within the candy bar form-

factor housing. The user-replaceable 920 mAh Lithium-Ion (Li-Ion) battery provides up to 180

minutes of talk time with up to 250 hours of standby time1. The phone accepts 3V mini

subscriber identity module (SIM) cards that fit into the SIM holder next to the battery. These

telephones feature a 128 x 160 pixel high-resolution color graphics display and an internal

antenna.

Features

C257/C261 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:

• A 128 x 160 pixel high-resolution color graphics display

• Internal antenna

• Caller line identification (CLI) (Network, subscription and SIM card or service provider

dependent feature. Not available in all areas.)

• Lower voltage technology that provides increased standby and talk times

• Extended GSM (EGSM) channels

• Tri-coder/decoder (CODEC) that allows full rate, half rate, and enhanced full rate modes of

transmission

• Display animation

•VibraCall

vibrating alert

• 5-Way navigation key

• Simplified text entry using iTAP™ predictive text entry

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Motorola C257 Service Manual Page 9

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