MMC vs. SD card

MultiMediaCard (MMC) is a flash memory card standard. Typically, an MMC is used as storage media for a portable device, in a form that can easily be removed for access by a PC.

Secure Digital (SD) is a flash 

(non-volatile) memory card format and is used for storage. MMC and SD cards differ in their physical size,capacity and their usage.

Both come in different memory sizes as well. While MMCs can be used in a standard SD card slot, the latter cannot be used in a MMC slot.

The Multi Media Card (MMC) is a flash memory card standard.
The Secure Digital (SD) Card is a flash memory card format.

MMC was developed by Siemens AG and SanDisk, and introduced in 1997.
SD Card was developed by Matsushita, SanDisk and Toshiba in 1999.

MMC are normally used as storage media for portable devices, such as digital cameras, cellular phones,digital audio players and PDAs.
SD card is used as a storage media in the following: Sony PS 3, Wii, GP2X GNU/Linux based portable games console, DAB radios, Global Positioning System receivers,Camcorders, cellular phones, digital audio players, PDAs etc.

The size of a standard MMC card is 24 mm x 32 mm x 1.4 mm while that of a SD card is 24 mm × 32 mm × 2.1 mm. So from the size comparison, we can see that SD cards are much thicker than the MMC cards, 2.1 mm against 1.4 mm.

SD cards are normally available in two more versions. They are miniSD and microSD. MicroSD is the smallest memory card available commercially. The size is 15mm × 11mm × 0.7mm. It is about 25% of the size of an SD card. With the help of adapters it can be used in those devices which are meant for SD, miniSD, or Memory Stick Duo cards; but they are not universally compatible.

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TDMA - Time Division Multiple Access

Time division multiple access (TDMA) is a channel access method for shared medium networks. It allows several users to share the same frequency channel by dividing the signal into different time slots. The users transmit in rapid succession, one after the other, each using its own time slot. This allows multiple stations to share the same transmission medium (e.g. radio frequency channel) while using only a part of its channel capacity. TDMA is used in the digital 2G cellular systems such as Global System for Mobile Communications (GSM), IS-136, Personal Digital Cellular (PDC) and iDEN, and in the Digital Enhanced Cordless Telecommunications (DECT) standard for portable phones. It is also used extensively in satellite systems, combat-net radio systems, and PON networks for upstream traffic from premises to the operator.

CDMA- Code Division Multiple Access

Stands for "Code Division Multiple Access." CDMA is a wireless transmission technology that was developed during World War II by the English allies to avoid having their transmissions jammed. After the war ended, Qualcomm patented the technology and made it commercially available as a digital cellular technology. Now CDMA is a popular communications method used by many cell phone companies.

Unlike the GSM and TDMA technologies, CDMA transmits over the entire frequency range available. It does not assign a specific frequency to each user on the communications network. This method, called multiplexing, is what made the transmissions difficult to jam during World War II. Because CDMA does not limit each user's frequency range, there is more bandwidth available. This allows more users to communicate on the same network at one time than if each user was allotted a specific frequency range.

Because CDMA is a digital technology, analog audio signals must be digitized before being transmitted on the network. CDMA is used by 2G and 3G wireless communications and typically operates in the frequency range of 800 MHz to 1.9 GHz.  ( CDMA )

SECURE DIGITAL CARD - [SD card]

Secure Digital Input/Output (SDIO) is an important standard for devices that feature interchangeable memory options. In today's exploding world of portable electronics devices, that's a large number indeed.

Memory is stored on various forms of devices. Portable and non-portable devices store information on both internal hard drives and external hard drives. External hard drives have varying degrees of portability, mostly due to the size of the drives.

One way to store memory is on a smaller hard drive. These come in a few shapes and sizes. One is called a Memory Stick. Another is called a Secure Digital (SD) card. This is where SDIO comes in.

GLOBAL SYSTEM FOR MOBILE COMMUNICATIONS

GSM, or Global System for Mobile Communications, is a cellular phone protocol that is standard in most parts of the world. Technology experts created the protocol in the 1980s and '90s to standardize cellular phone service between countries in Europe. GSM phones use subscriber identity module (SIM) cards, which is essential to their function and enable the user to change phones easily. It is a chief competitor to the Code Division Multiple Access (CDMA) protocol.

Technology

Technically, the term GSM refers to second-generation (2G) voice networks that operate based on a combination of time division multiple access (TDMA) and frequency division multiple access (FDMA). TDMA takes the frequency channel the phone uses and divides it into individual bits of time that are assigned to each user. FDMA divides the frequency band into sections and assigns one to each cell phone tower. Towers are typically spread far enough apart so that those using the same frequency do not overlap their areas of coverage.

A Basic knowledge about the Sim Card

Sim Cards are of four (4) Types. Named as Below H1, H2, H3, H4

    H1= You Will Get Normal Network On This Sim

    H2= You Will Get Better Network On This Sim, Means Strong

    H3= You Will Get More Better Network On This Sim, Means Stronger

    H4= Normal, Better, More Better Is Nothing In Front OF This Sim.

A subscriber identity module or subscriber identification module (SIM) is an integrated circuit that securely stores the International Mobile Subscriber Identity (IMSI) and the related key used to identify and authenticate subscribers on mobile telephony devices ,such as mobile phones and computers.

Fast Charging Device

According to Khare, her device can last for 10,000 charge-recharge cycles,compared with 1,000 cycles for conventional batteries. The so called super-capacitor, a gizmo that can pack a lot of energy into a tiny space, charges quickly and holds its charge for a long time.