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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".
-
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