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PART II. DEFINITIONS The following is a list of commonly used abbreviations used in cellular phones. SIDH A 15-bit field in the NAM designating the System Identification for the Home System. Bit 0 of the SIDH corresponds to the Preferred System flag used elsewhere in the NAM. Bits 6 and 5 of byte 0 are international code bits. Normally the SIDH is entered during programming of the phone as a 5 digit decimal number. Enter 0's to the left-most unused positions when reprogramming. L.U. Local Use Flag. Tells the cellular phone user if it must preregister with the system. Preregistration with the system means that a mobile must transmit its parameters to the Cellular System as soon as the power-up task and the control channel tasks are completed. "1" enables the flag. Usually set to "1". MIN MARK A 1-bit flag designating that MIN2 (area code) is always sent when making system access. "1" enables the flag. Usually set to "1". MIN2 A 10-bit field representing the area code of the mobile ID number. MIN1 A 24-bit field representing the mobile telephone number. MIN2 plus MIN1 equals MIN, the 10-digit phone number. SCM A 4-bit field designating the Station Class Mark. A (3-Watt) 832 channel mobile unit typically will be 1000, a 1.2 Watt portable 1001 or a 0.6 Watt handheld 1010 or 1110 (discontinuous transmission, meaning push-to-talk). These are class I, Class II and Class III power levels respectively. With the SCM the cellular system determines whether or not a cellular phone can be switched to one of the 156 channels. Bit-1 is "0" for 666 and "1" for 832. (See cellular freq. list) Bit-2 is "0" for a mobile unit and "1" for a voice-activated transmit. Bit-3 and -4 identify the power class of the phone: "00" = 3.0 watts "01" = 1.2 watts "10" = 0.6 watts "11" is not assigned IPCH An 11-bit field designating the initial paging channel to be used if in the home system. Normally it is 334 for wireline systems, 333 for non- wireline systems. But most phones allow other settings for test purposes. ACCOLC A 4-bit field designating the overload class for the cellular phone. The intention of this entry is to allow the Cellular System to be able to determine priority in the event of a system overload, however it is currently useless as the system operators have generally not provided guidance for thier installers. The usual (and correct) system now in effect (in U.S.) is to use a "0" plus the last digit of the phone number. Test phones should be set at "10",emergency vehicles at "11","12" through "15" are reserved. (A class 15 system is supposed to be police, fire, or military). P.S. 1 1-bit flag designating the preferred system. If PS is "0", channels 334 through 666(EVIL!!!) are used. If PS is "1" then channels 1 through 333 are used. Even numbered system numbers (B systems) require a PS of "0", odd system numbers (A systems) require a "1". GIM A 4-bit field designating the Group Identification Mark. This number tells the Cellular system how far to look in the SIDH to determine if it is roaming in a system which may have a roam agreement with the phone system. It is usually set to "10". LOCK DIGITS A 4-bit field designating the unlock code. The digit "0" in the lock code is represented by an "A" in the actual NAM hexidecimal data. A lock code of all "0" sometimes unlocks the cellular phone.(Note: Lock codes are 3 digits. When programming a phone use "0" as the first number.) E.E. A 1-bit flag designating that end-to-end signaling is enabled. End-to-end signaling means that the DTMF tones will be transmitted on the voice channel as well as being echoed on the handset. This feature in necessary for such services as Bank by Phone, activating answering machines and in third party long distance services such as Sprint and MCI. A "1" enables the flag. Usually set to "1". REP A 1-bit flag designating that repertory memory (speed dialing) in the cellular phone is enabled. And once a again a "1" enables the flag. H.A. A 1-bit flag designating that the horn alert feature in enabled. "1" enables the flag. H.F. A 1-bit flag designating that the handsfree option is enabled. A "1" enables the flag. Often, transceivers supplied as hands-free units require that this flag be left at "0". *****************************************************************************