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IS-54 and compatibility
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.

IS-54 and with
IS-54 was, in fact, backward compatible with analog cellular and indeed co-exists on the same radio channels as AMPS.
The IS-54 standard specifies 84 control channels, 42 of which are shared with AMPS.

IS-54 and AMPS
* Digital AMPS ( IS-54 and IS-136 ), a 2G mobile-phone standard that uses Time division multiple access
IS-54 and IS-136 are second-generation ( 2G ) mobile phone systems, known as Digital AMPS ( D-AMPS ).
IS-54 employs the same 30 kHz channel spacing and frequency bands ( 824-849 and 869-894 MHz ) as AMPS.
An AMPS / IS-54 infrastructure can support use of either analog AMPS phones or D-AMPS phones.

IS-54 and .
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.
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 also supported authentication, a help in preventing fraud.
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.
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.
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.

maintains and compatibility
* Windows XP 64-bit Edition, is a version for Intel's Itanium line of processors ; maintains 32-bit compatibility solely through a software emulator.
GM2 maintains backward compatibility with GM, but increases polyphony to 32 voices, standardizes several controller numbers, RPNs and Universal System Exclusive Messages, and incorporates the MIDI Tuning Standard.
MicroXwin is not a full-fledged replacement for X but maintains binary compatibility with standard X clients while providing better performance and significantly lower memory overhead by a different architecture of design that directly implements the system as a kernel module.
Application programmers can still use any addressing mode: all applications, regardless of their addressing mode ( s ), can coexist without modification, and IBM maintains an unwavering commitment to tri-modal backward compatibility.
Ham-Friendly ALE technique is also known as 2. 5G ALE, because it maintains 2G ALE compatibility while employing some of the adaptive channel management features of 3G ALE, but without the accurate GPS time synchronization of 3G ALE.
The Apple IIe maintains a high degree of backwards compatibility with the previous two Apple II models, allowing most hardware and software from those systems to be used.
As a rule, the host adapter appears as SCSI ID 7, which gives it the highest priority on the SCSI bus ( priority descends as the SCSI ID descends ; on a 16-bit or " wide " bus, ID 8 has the lowest priority, a feature that maintains compatibility with the priority scheme of the 8-bit or " narrow " bus ).
The VCL framework maintains a high level of source compatibility between versions which simplifies adapting existing source code to a newer Delphi version.
GB18030 can be considered a Unicode Transformation Format ( i. e. an encoding of all Unicode code points ) that maintains compatibility with a legacy character set.
GB18030 also maintains compatibility with Windows Codepage 936, sometimes known as GBK, which is Microsoft's extended version of GB2312, with the exception of the euro sign which is given a single byte code of 0x80 in Microsoft's later versions of GBK and a two byte code of A2 E3 in GB18030.
The API is similar to the Internet Explorer ActiveX control so it maintains a high degree of compatibility.
It maintains 100 % database compatibility with Scid.
A third compatibility mode known as either " almost standards mode " or " strict mode " which maintains the " traditional " vertical sizing of table cells according to the CSS2 specification, has been implemented in these browsers: Safari, Opera 7. 5 ( and later ), all Gecko-based browsers since 1. 0. 1 ( such as Firefox ) and Internet Explorer 8.
The problem with the XML declaration was fixed in version 7 of Internet Explorer, in which the XML prolog is simply ignored .< ref > However, for maximum compatibility with existing and older web browsers, the World Wide Web Consortium, which maintains the XHTML specification, suggests that authors of XHTML documents could consider omitting the XML declaration.

maintains and with
Thus if the gyro and platform-controller combination maintains the platform with zero angular deviation about the **yf axis, the system can be rotated with an angular velocity Af if a torque is supplied to the gyro output axis Aj.
Azerbaijan also maintains good relations with the European Union, in the framework of its Eastern European Neighbourhood Policy ( See Azerbaijan and the European Union ).
In October 2008, the United States Department of Justice defined an Alford plea as: " when a the defendant maintains his or her innocence with respect to the charge to which he or she offers to plead guilty ".
The Bahamian Government maintains the value of the Bahamian dollar on a par with the U. S. dollar.
Burkina maintains diplomatic relations with the Republic of China ( usually referred to as " Taiwan ") instead of the People's Republic of China.
Burkina maintains cordial relations with Libya.
While traditional teaching maintains that any bishop with apostolic succession can validly perform the ordination of another bishop, some churches require two or three bishops participate, either to ensure sacramental validity or to conform with church law.
Cameroon maintains significant bilateral relations with several countries.
also maintains diplomatic relations with the People's Republic of China.
The Government of Cuba maintains close relationships with Iran and North Korea, and has provided safe haven to members of ETA after an agreement with the Spanish government ( under Felipe González ), FARC, and the ELN.
Cyprus has historically followed a non-aligned foreign policy, although it increasingly identifies with the West in its cultural affinities and trade patterns, and maintains close relations with Greece.
The University has general exchange agreements with many European and US universities and maintains a special exchange program agreement with National Chiao Tung University ( NCTU ) in Taiwan where the exchange students from the two universities maintains offices for, among other things, helping local students with applying and preparing for an exchange year as well as acting as representatives ( NCTU Europe – NCTU students at Chalmers, Chalmers Asia – Chalmers students at NCTU ).
It maintains diplomatic relations with more than 85 countries, of which 63 have permanent representation in Prague.
This verse, in accordance with the Mosaic Law, maintains that the punishment for murder is the death penalty.
Carolina also maintains a rivalry with New Orleans, with both teams playing in the NFC South division.

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