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The phrase ISDN standard refers to the devices that are required to connect the end node to the network Although some vendors provide devices that include
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Remote Connectivity Concepts
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several functions, a separate device defines each function within the standard The protocols that each device uses are also defined and are associated with a specific letter Also known as reference points, these letters are R, S, T, and U ISDN standards also define the device types They are NT1, NT2, TE1, TE2, and TA The architecture for these devices and the reference points are shown in Figure 8-1 and are explained in the following section
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Reference points are used to define logical interfaces They are, in effect, a type of protocol used in communications The following list contains the reference points:
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Defines the reference point between a TE2 device and a TA device Defines the reference point between TE1 devices and NT1 or NT2 devices Defines the reference point between NT1 and NT2 devices
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Defines the reference point between NT1 devices and line termination equipment This is usually the central switch
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Network terminator 1 (NT1) is the device that communicates directly with the central office switch The NT1 receives a U-interface connection from the telephone company and puts out a T-interface connection for the NT2 NT1 handles the physical layer portions of the connection, such as physical and electrical termination, line monitoring, and multiplexing Network terminator 2 (NT2) is placed between an NT1 device and any adapters or terminal equipment Many devices provide the NT1 and NT2 devices in the same physical hardware Larger installations generally separate these devices An
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figure 8-1
TE1 S/T NTI
ISDN device architecture
ISDN switch
8:
Remote Connectivity
example of an NT2 device is a digital private branch exchange (PBX) or ISDN router An NT2 device provides an S interface and accepts a T interface from an NT1 NT2 usually handles data link and network layer functions, such as contention monitoring and routing, in networks with multiple devices Terminal equipment 1 (TE1) is a local device that speaks via an S interface It can be directly connected to the NT1 or NT2 devices An ISDN telephone and an ISDN fax are good examples of TE1 devices Terminal equipment 2 (TE2) devices are common, everyday devices that can be used for ISDN connectivity Any telecommunications device that is not in the TE1 category is classified as a TE2 device A terminal adapter is used to connect these devices to an ISDN and attaches through an R interface Examples of TE2 devices include standard fax machines, PCs, and regular telephones A terminal adapter (TA) connects TE2 devices to an ISDN A TA connects through the R interface to the TE2 device and through the S interface to the ISDN The peripheral required for personal computers often includes an NT1 device, better known as ISDN modems ISDN modems are used in PCs to connect them to an ISDN networkThe term modem is used incorrectly here ISDN passes data in a digital format, so there is no need to convert the digital data from the computer the way a traditional modem converts the digital data to analog so that it can travel Conventional modems convert analog to digital and vice versa
identifiers
Standard telephone lines use a ten-digit identifier, better known as a telephone number, which is permanently assigned ISDN uses similar types of identifiers, but they are not as easily used as a telephone number ISDN uses five separate identifiers to make a connection When the connection is first set up, the provider assigns two of these: the service profile identifier (SPID) and the directory number (DN) These are the most common numbers used because the other three are dynamically set up each time a connection is made The three dynamic identifiers are the terminal endpoint identifier (TEI), the service address point identifier (SAPI), and the bearer code (BC) The directory number (DN) is the ten-digit phone number the telephone company assigns to any analog line ISDN services enable a greater degree of flexibility in
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