IS-54 security features is also a matter of interest as it was the first standard to specify some security measures.

IS-54 uses the CAVE ( Cellular Authentication, Voice Privacy and Encryption ) algorithm for authentication and the CMEA ( Cellular Message Encryption Algorithm ) for encryption.

That name is based on the abbreviation for time division multiple access, a common multiple access technique which is used by multiple protocols, including GSM, as well as in IS-54 and IS-136.

IS-136 added a number of features to the original IS-54 specification, including text messaging, circuit switched data ( CSD ), and an improved compression protocol.

IS-54 is the first mobile communication system which had provision for security, and the first to employ TDMA technology.

IS-54 stands for Interim Standard-54, which is a mobile communication standard employing digital technology.

The ANSI designation of IS-54 is ANSI / TIA / EIA-627, but this standard is still popularly referred to as IS-54.

IS-54 maintains compatibility with Advanced Mobile Phone System ( AMPS ) in many ways.

The quest resulted in IS-54, the first American 2G standard.

IS-54, on the other hand, increased capacity by digital means using TDMA protocols.

Using IS-54, a cellular carrier could convert any of its system's analog voice channels to digital.

IS-54 was, in fact, backward compatible with analog cellular and indeed co-exists on the same radio channels as AMPS.

IS-54 employs the same 30 kHz channel spacing and frequency bands ( 824-849 and 869-894 MHz ) as AMPS.

The IS-54 standard specifies 84 control channels, 42 of which are shared with AMPS.

To maintain compatibility with the existing AMPS cellular telephone system, the primary forward and reverse control channels in IS-54 cellular systems use the same signaling techniques and modulation scheme ( binary FSK ) as AMPS.

An AMPS / IS-54 infrastructure can support use of either analog AMPS phones or D-AMPS phones.

The access method used for IS-54 is Time Division Multiple Access ( TDMA ), which was the first U. S. digital standard to be developed.

Time Division Multiple Access or TDMA was initially defined by the IS-54 standard and is now specified in the IS-13x series of specifications of the EIA / TIA.

The IS-54 system has different synchronization sequences for each of the six time slots making up the frame, thereby allowing each receiver to synchronize to its own preassigned time slots.

The modulation scheme for IS-54 is 7C / 4 differential quaternary phase shift keying ( DQPSK ), otherwise known as differential 7t / 4 4-PSK or π / 4 DQPSK.

Variations of this codec have been used in several 2G cellular telephony standards, including IS-54, IS-136 ( D-AMPS ), GSM ( Half Rate speech ) and iDEN.

The new fee schedule also was supported by Commissioner of Licenses and Inspections Barnet Lieberman and Health Commissioner Eugene A. Gillis.

Lincoln also supported the Wilmot Proviso, which, if it had been adopted, would have banned slavery in any U. S. territory won from Mexico.

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During this session, Johnson also supported the pro-slavery Crittenden Compromise.

The king also supported the exploration of the Atlantic Ocean led by prince Henry the Navigator but, after Henry's death in 1460, he did nothing to continue this course of action.

He also supported the creation of a network of state-run lodges ( Parador ) in historic buildings of Spain.

Rhoticity was further supported by Hiberno-English, West Country English and Scottish English as well as the fact most regions of England at this time also had rhotic accents.

Token Ring would eventually be supported with the similar TokenTalk product, which also used the same Network control panel and underlying software.

MacTCP would become a standard part of the Mac OS in 1994, by which time it also supported SNMP and PPP.

Ethernet and Token Ring was also supported, known as EtherTalk and TokenTalk respectively.

It also was responsible for switching to ROM BASIC when the system was turned on with the break key pressed, and later supported a primitive LAN system, using the RS232 port with modified cabling.

The " double width " mode of the TRS-80 was also supported, so 256 x 192 pixels ( in 32x16 character mode ), or 320 x 300 pixels ( in 40x24 character mode ) were also possible.

The video card also supported 16 foreground and 16 background colors per character, by providing one byte per character position ( 2K ) of " color ram ".

He also supported Émile Zola's position in the Dreyfus affair.

Generally, ' direct support ' also means that the artillery unit provides artillery observation and liaison teams to the supported units.

She suggests this explains the low numbers of black women who participated in the feminist movement in the 1970s, pointing to Louis Harris ' Virginia Slims poll done in 1972 for Philip Morris that she says showed 62 percent of black women supported " efforts to change women's status " and 67 percent " sympathized with the women's rights movement ", compared with 45 and 35 percent of white women ( also Steinem, 1972 ).

The MK 16 Launching Group also had configurations that supported HARPOON RGM-84 ( Onboard Knox Class Destroyer Escorts ( Frigates )) or a variation of the Tartar missile in limited distribution.

PETSCII was also supported by the nationwide online service Quantum Link.

Work's essay, “ Odyssean Influence on the Beowulf ,” also supported the Homeric influence.

Britain wished to deny Russia access to the " warm waters " and supported the integrity of the Ottoman Empire, although it also supported a limited expansion of Greece as a backup plan in case integrity of the Empire was no longer possible.

One firm, Scammell and Nephew Ltd, took a civil action against Attlee and the other Labour members of the committee ( although not against the Conservative members who had also supported this ).

The Church of Jesus Christ of Latter-day Saints ( also called Mormons ) neither promotes nor opposes capital punishment, although the church's founder, Joseph Smith, Jr., supported it.

Though Gauss had up to that point been financially supported by his stipend from the Duke, he doubted the security of this arrangement, and also did not believe pure mathematics to be important enough to deserve support.