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- Demarc (also Dmark or de-mark)
- Demarcation point between the wiring that comes in from the local telephone company and the wiring you install to hook up your equipment or system to the CPE.
- DID (Direct Inward Dialing)
- A service offered by telephone companies which allows the last 3 or 4 digits of a phone number to be transmitted to the destination exchange.
For example, a company could have 10 incoming lines, all with the number 234 000. If a caller dials 234 697, the call is sent to 234 000 (the company's exchange), and the digits 697 are transmitted. The company's exchange then routes the call to extension 697. This gives the impression of 1000 direct dial lines, whereas in fact there are only 10. Obviously, only 10 at a time can be used.
- DS-1
- A digital transmission link with a capacity of 1.544 Mbps (1,544,00 bits per second). This link can handle 28 point-to-point DS-0s, or 24 "DS-0s" for 24 voice conversations.
- DS-3
- A digital transmission link with a capacity of 44.736 Mbps. This link can handle 28 DS-1s.
- DNCF (Directory Number Call Forwarding)
- From Pacbell. Provides TelePacific the option for the end user to retain an existing PB assigned telephone number when the end user changes local service provider from PB to TelePacific. (Service provider number portability)
- E-911 (Enhanced 9-1-1)
- A method of routing 911 calls to a Public Service Answering Point that uses a customer location database to determine the location to which a call should be routed. E-9 .1 .1 service includes the forwarding of the caller's Automatic Number Identification (ANI) to the PSAP where the ANI is used to retrieve and display the Automatic Location Identification (ALI) on a terminal screen at the answering Attendant's position displaying name, address, and telephone number. It usually includes selective routing.
- End Carrier
- The local carrier who terminates the call to the end user.
- EUCL (End User Common Line Charge)
- A FCC tariff term defined in FCC Rules 69.104 as follows: "A charge that is expressed in dollars and cents per line per month shall be assessed upon end users that subscribe to local exchange telephone service, Centrex or semi-public coin telephone service to the extent they do not pay carrier common line charges. Such charge EUCL shall be assessed for each line between the premises of an end user and a Class 5 office that is or may be used for local exchange service transmissions. Each Single Line Service is charged one CALC or EUCL. The amount varies by state."
- Exchange Area
- Geographically bounded areas that a LATA is divided into.
- Extended Demarc
- A demarcation point that is extended beyond the MPOE (Minimum Point of Entry).
- Facilities-based CLEC
- When a CLEC utilizes unbundled network elements from the LEC and/or provides facilities such as its own switch or transmission media. The CPUC's definition is: those CLECs who directly own, control, operate, or manage conduits, ducts, poles, wires, cables, instruments, switches, appurtenances, or appliances in connection with or to facilitate communications within the local exchange portion of the public switched network.
- FCC (Federal Communications Commission)
- The government agency that regulations telecommunications and other broadcast medium. www.fcc.gov
- FOC (Firm Order Commitment)
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