MOBILE DEFINITIONS :
R
RAM (Random-Access Memory)
This is the memory where the software resides while it is running along with the data it is using. RAM is used by both OS and application software.
RAM is very fast but volatile, meaning that all information is lost when electric power is cut off. That makes it useful for temporary storage of data that requires fast access.
Normally, devices with RAM also have another type of storage memory (flash memory or a hard drive) that stores the information while the power is off.
Devices with more RAM can run more complex software and multiple applications at the same time.
RBDS (Radio Broadcast Data System)
Radio Broadcast Data System is the official name used for the U.S. version of RDS, though the "RDS" name
seems to be at least as common in daily usage. The two standards are nearly identical, with only slight differences, mainly in which numbers are assigned to each of the 31 music and other program formats the RBDS system can identify. Generally, mobile phone RDS implementations make use only of Radio Text info. It's 64-character free-form textual information that can be either static (e.g. station slogans) or in sync with the programming such as the title and artist of the currently-playing song.
Mobile phone FM tuners don't receive some of the RDS information that may be available, such as time, program type (PTY) or traffic announcements (TA/TP).
RDS (Radio Data System)
Radio data system or RDS is a standard for sending small amounts of data through conventional FM radio broadcasts. The RDS system standardizes several types of information transmitted, including track/artist info and station identification.
Resistive touchscreen
Resistive touchscreens operate by sensing direct pressure applied by the user. It can be activated by pressing it not only with a finger but also with a stylus (unlike the competing capacitive technology).
A resistive touch screen consists of a touch layer placed on top of a standard display. The touch layer normally includes two transparent electrical layers separated by a small gap.
Pressing the display's surface causes the two separate layers to come into contact, which creates an electrical connection that can be sensed and located.
Resolution
A term that refers to the number of pixels on a display or in a camera sensor (specifically in a digital image). A higher resolution means more pixels and more pixels provide the ability to display more visual information (resulting in greater clarity and more detail).
Resolution does not refer to the physical size of the display, camera sensor or image. For example, two displays with the same resolution can have different physical dimensions. And since there will be more pixels per inch on the smaller one, the image provided by it should be clearer and more detailed (although graphics will be physically smaller).
Ringer ID
Allows users to assign specific ringtones to individual phone book entries so they can be identified by the ringtone when calling.
Ringing profiles
Features allowing users to create distinct profiles consisting of detailed ringer settings. Those profiles can be easily accessed and activated when needed.
A wide array of options can be changed by the user in each profile (such as tones, vibration, melodies, ringer volume, etc.) and changes take effect all at the same time when this profile is activated.
Ringtone
That is the sound that a phone makes to indicate an incoming call.
Roaming
Refers to using a mobile phone outside of your service provider's coverage area. Typically, service providers charge higher fees for calls, messages and access to the Internet.
ROM (Read-Only Memory)
A form of data storage. This type of memory keeps the saved data even if the device power is off. The data on the ROM can be loaded into the RAM if needed. The word Read-Only identifies it as "read-only memory", since the reprogramming process is generally infrequent, comparatively slow, and often does not permit random access writes to individual memory locations.
RS-MMC (Reduced-Size Multi Media Card)
A type of memory card that was popular in the past.
Memory cards are based on Flash memory and are used as solid state storage, their main purpose being an inexpensive way to store or transfer data between computers and other digital products.
RS-MMC are based on the MMC standard and share their form-factor and size with MMCmobile cards. The difference between the two formats is that MMCmobile cards are dual-voltage and can operate in older phones with a high-voltage (3V) slot as well as in newer models with a low-voltage (1.8V) slot. Traditional RS-MMC cards can only work in devices with a high-voltage (3V) slot.
RSA (Rural Service Area)
A geographic area of population defined by the US Census Bureau. RSA stands for areas which are not within an MSA (Metropolitan Statistical Area). Both divisions were used by the FCC to geographically separate cellular frequency licenses granted to wireless carriers in the 1980s.
RSS (Rich Site Summary)
A family of XML-based web feed formats used to publish frequently updated information such as news headlines, blog entries, etc.
RSS feeds are very lightweight (especially compared to full web pages) and are ideal for mobile devices which often suffer from limited bandwidth and screen size. A special software (called RSS-reader) is needed for the RSS feeds to be displayed.
Ruggedized (Rugged)
Ruggedized devices (e.g. mobile phones) offer protection against rough use and/or a rough environment. For example, such devices are normally resistant to shock, water and dust. In order to measure the level of protection manufacturers usually get standard certificates in one or several of the available systems. Such standardization systems include the US Military Standard (MIL-STD or Mil-Spec) or the Ingress protection rating (IP).
