Phone prefixes are the codes that tell the phone companies which state, city, or county a person is calling from. As more people move to an area the phone prefixes change and additional ones are added. Depending on the state, there may only be a few prefixes. Prefixes help to differentiate between each person's phone …
The main mobile telephone systems in the last twenty five years have been: YearMobile Telephone System 1981 Nordic Mobile Telephone (NMT) 1983 Advanced Mobile Phone System (AMPS) 1985 Total Access Communication Systems (TACS) 1986 Nordic Mobile Telephony (NMT) 1991 American Digital Cellular (ADC) 1991 Global System for Mobile Communication (GSM) 1992 Digital Cellular System (DCS) …
Tip and Ring are telephony slang for the two wires which make up the electrical circuit used for telephone wiring. Tip is the nickname for the electrically positive wire and Ring is the nickname for the electrically negative wire. Tip is the ground side, which is positively charged, and Ring is the battery side, which …
IS-95 is a standard for CDMA (Code Division Multiple Access) Digital Cellular. Mobile Frequency Range Rx: 869-894; Tx: 824-849 Multiple Access Method CDMA/FDM Duplex Method FDD Number of Channels 20 (798 users per channel) Channel Spacing 1250kHz Modulation QPSK/OQPSK Channel Bit Rate 1.2288Mb How CDMA Works In a CDMA system, your encoded voice is digitized …
ESN (Electronic Serial Number) An Electronic Serial Number is a code created to identify mobile devices. An ESN is 32 bits long, and the distribution of information in those bits has changed as the standard has evolved. The first 8 bits originally represented the manufacturer code, leaving 24 bits for the manufacturer to assign codes …
Most people send text messages from the very small keypads on their mobile phones, and most people who receive text message messages read them on the tiny screens of their mobile phones. Because of those considerations, and because many service providers limit text messages 160 characters in length, most people who use text messages learn …
A 110 block is a punch-down block used to connect wiring for telephone systems, data network wiring, and other low-voltage wiring applications. It improves on the 66 block by supporting higher frequencies and using space more efficiently. A punch-down tool is used to force solid wire into metal slots on the 110 block. Present residences …
This is the “right hand” of both the professional and the amateur lineman. Basically, it is a customized portable telephone which is designed to be hooked onto raw cable terminals in the field and used to monitor the line, talk, or dial out. The monitor function is usually the main difference between the “butt-in” test …
PCS (Personal Communications Service) is a set of standards. Most PCS standards are based on an existing standard. PCS is little more than the operation of these standards on the frequency bands of 1930-1990MHz for receiving and 1850-1910Mhz for transmitting. PCS StandardBase Standard PCS TDMA IS-136 PCS CDMA IS-95 PCS 1900 GSM PACS PHS cordless …