Cellular Essay (ameritech) Cellular Essay (ameritech) The orange is the home digital service area and the yellow is analog service area. Ameritech also offers free long distance all over the U.S.A. With a special package deal they have going right now. For sixty-five dollars a month you get 325 minutes per month. For their Chicago land service area it depends on which plan you pick, because the local rate per minute could either be .25 cents or .29 cents per minute for local calls that went over your minutes you received for free already. The price per minute also changes depending on if you are in the peak or off peak time slots.
Peak hours are from 6 a.m. to 10 p.m. Monday through Friday. Off peak times are from 10:01 p.m. to 5:59 a.m. Monday through Friday.
Saturday and Sunday are all day off peak and some holidays. Long distance runs from .25 cents per minute to .35 cents per minute. Depending on the distance it varies. If you leave your service area and enter another then roaming charges will be also added. If you decide to go with a cellular phone they have package deals that include a cell phone for a thirty five-dollar activation fee. They offer several packages to meet everyones needs.
You may also upgrade to a better phone, but then you must purchase that phone. I contacted Ameritech and they told me that because I wasnt a business that they were unable to release that information. They then told me that they would get a hold of one of their managers and maybe they could give me this information. They took my name and number and I never received anymore information. I told them this was for a school project, but that didnt matter.
The PBX I chose was Meridian1 option 11c. This is a powerful PBX that comes in a small package. It supports 30 to 400 lines. Some other features are digital telephones, in building wireless communications, voice messaging, call center, PC-based system management, Ethernet connection, remote connection, keycode software activation, and multimedia applications. This PBX can be easily upgraded to new capabilities. Some of the programs that this PBX can run are Computer Telephony Integration (CTI), Customer Controlled Routing (CCR), and Integrated Voice Response (IVR).
Dual-tone multifrequency dial (DTMF) is a keypad containing 12 to 16 buttons. These are arranged in columns and rows. When the buttons are pushed they send two tones to the central exchange. The central exchange decodes the tones and rings the destination. A rotary phone or pulse dialing phone is sent over by clicks.
The rotary dial contains two separate contacts. These contacts open and close for every digit. So if the number 3 were dialed, then the contacts would open and close 3 times. But a pulse dial will not pass through the central exchange. Which means that if a voice mail system answers you can not get through to the menu options.
The number 8 tones are column 1336 Hz and row 852 Hz. For the central office to receive the tone it must be present for 40 ms and a pause of 60 ms between digits. For a rotary phone it takes 15 seconds to transmit 10 digits. Carried Load: calls that are served, traffic that is carried to its destination Offered load: arriving calls, calls attempting to enter a system Blocked calls: traffic that can not be carried to its destination, blocked calls leave the system or overflow to another circuit Blocked Calls-Cleared: upon receiving indication that all circuit are busy and can not be handled, the caller hangs up and is lost to the system. Blocked Calls-Delayed: upon receiving indication that all circuits are busy, the caller waits and is held in the system until it can be processed.
First attempt traffic is a formula that Jacobsen developed to figure the percentage of people who retry their call immediately. The Jacobsen retrial table assumes that 70% of the people retry immediately. Henry Jacobsen developed all of the retry tables. These tables help the servers figure out how many blocked calls that they receive. This allows them to figure if they need more lines or how many lines they will need in a certain area. PCS: Personal communication service, transmit 1850-1910 MHz, receive 1930-1990 MHz PCS 1900: Provided by time division multiple access or code division multiple access technology.
BSC: Connects to base transceiver station sites. BTS: Base transceiver station for the PCS 1900 is a building that holds base station transmitter and receivers and antenna tower. The tower has 9 antennas with one transmitting antenna and two receiving antennas. HLR: Home location register tracks if the phone is in the home service area BTA: The 51 trading areas were divided into basic trading areas MTS: Mobile telephone system that uses 35 and 45 MHz radio frequencies The personal communication service (PCS) transmits 1850-1910 MHz and receives 1930-1990 MHz. It uses pulse code modulation and uses 256 levels.
Which is full duplex. Mobile telephone service used 35-45 MHz. This was mostly two-way radios. MTS is a half-duplex system. Cellular Radio transmits 825-845 MHz and receives at 870-890 MHz. Cellular radio is analog.
It is also full duplex. Multiplexing: The process of combining many individual signals so they can be sent over one medium. Time Division Multiplexing: Converting speech paths into samples, then combining the different samples by transmitting each sample at a different time, so it can be transmitted over one medium. Space Division Multiplexing: Multiple communications are placed over different wire pairs inside one cable. Frequency Division Multiplexing: Converting each speech path to different frequency signals and the combining the different frequencies so they are sent over one medium. RS232 Automatic call distributor uses DTMF digits to handle calls.
It might process calls by automated features like telling you to press one to go to a certain area of a company. Uniform call distributor is a feature that is on most PBXs. This connects the calls in sequential fashion. The first agent gets the most calls and the last agent gets the fewest. A call sequencer is the least sophisticated call distributor. It leaves it up to the agent to decide which call to answer.
The Nyquist theorem is the samples rate of an analog signal twice its highest frequency. If the highest frequency were 4000 Hz then 8000 would be twice of the 4000. So you would take a sample every 1/8000 of second. A key system is a special telephone that can handle access to several different telephone lines. A key system would be good for a business that had to answer telephones by an operator in order.
Like they used a key system at Pizza Hut that I use to work for. The phones could handle several lines that a person would answer to take someones order.