gtin check digit excel formula Figure 3-32 Default carriers in Software

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Figure 3-32 Default carriers
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Dialed carrier With each outbound call, the local exchange carrier is informed which alternate carrier should be used This typically is accomplished by dialing special sequences when establishing calls (Figure 3-33)
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Figure 3-33 Dial selectable carriers
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383 Telephone Equipment
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Telephony products can be generally categorized as being: telephone switches, telephone station equipment (telephone sets), or add-ons or peripherals to one or the other
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Telephone equipment is differentiated based on where it is installed: Customer Premise Equipment Customer premises equipment, or CPE for short, refers to the telephony products that you purchase or lease and install at your own locations in order to assemble any private telephone system Carrier Switching Equipment Carrier switching equipment consists of the telephone switches and transmission equipment used by a carrier to implement its network This equipment is further categorized as Central office equipment if it is located in a Central Office (also know as a CO, End-Office or Local Office) Co-Located Equipment Co-located equipment is equipment that is not owned by the carrier but is co-located with carrier equipment in a carrier facility such as a central office In this section we'll look at how telephone systems and the products that constitute them, can be modeled In 10 we'll pull everything together by actually looking at the implementations of various types of products Carrier Switching Equipment and Telephone Company Services If you are assembling a new telephone system for your home or business, or are assessing your existing system, one of the first steps is to determine what services you want to obtain from your local exchange carrier(s), that is, your local telephone company or companies, and any other carriers with which you wish to have connections The functionality of your telephone system (whether it is just a single telephone or a collection of switches forming a private network) will be a combination of the features and services built into your telephony
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equipment, and any telephony features and services that you subscribe to from the telephone company (or companies) that your equipment can access As described in section 382, a LEC, generally provides the connection(s) between your telephone system and the PSTN In other words, the LEC owns the switch or switches that extend service to your telephone equipment, for local calling and typically for access to IXCs You may, however, connect directly to one or more IXCs through what is referred to as carrier bypass The notion of bypass applies only in the context of competing carriers In countries where a single telephone company provides all of these services, this option does not apply A switch owned by the LEC to which your lines or trunks connect is known as a central office switch, (CO switch for short), or a public exchange The combination of line interfaces and telephony features and services available for subscription on a given CO switch represents the service offerings Customer Premises Equipment (CPE) Options The trunks or lines that you already have and those that are available to you from various telephone companies will, in part, dictate what types of telephony products are applicable to your needs Depending on the requirements, your telephone system might be as small as a single telephone to be connected to a subscriber line from your local telephone company or cellular carrier, or it may be as complex as a global private network
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384 Modeling Telephone Switches
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A telephone switch, or just switch for short, is a telephony product characterized as an implementation of telephony resources that, at a minimum, includes call processing and switching resources, and at least two station or network interface type devices A generic telephone switch is illustrated in Figure 3-34
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