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videoconferencing within the grasp of the end user at an affordable price. 64 Kbps makes short shrift of LAN-based text file downloads and reduces the time required for graphics-intensive Web page downloads to reasonable levels.
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The Primary Rate Interface (PRI)
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The other major implementation of ISDN is called the Primary Rate Interface (PRI). The PRI is really nothing more than a T-Carrier in that it is a four-wire local loop, uses AMI and B8ZS for ones-density control and signaling, and provides 24- to 64-Kbps channels that can be distributed among a collection of users as the customer sees fit (see Figure 5-2). In PRI, the signaling channel operates at 64 Kbps (unlike the 16-Kbps D-channel in the BRI) and is not accessible by the user. It is used solely for signaling purposes; that is, it cannot carry user data. The primary reason for this is service protection. In the PRI, the D-channel is used to control the 23 B-channels and therefore requires significantly more bandwidth than the BRI D-channel. Furthermore, the PRI standards enable multiple PRIs to share a single D-channel, which makes the D-channel s operational consistency all the more critical. The functional devices and reference points are not appreciably different from those of the BRI. The local loop is still identified as the U reference point. In addition to an NT1, we now add an NT2, which is a service distribution device, usually a Private Branch Exchange (PBX), which allocates the PRI s 24 channels to customers. This makes sense because PRIs are typically installed at businesses that employ PBXs for voice distribution. The S/T reference point is now divided; the S reference point sits between the NT2 and TEs, whereas the T reference point is found between the NT1 and the NT2.
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Figure 5-2 The ISDN PRI.
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T-1 Up to 24 Channels (signaling channel implied)
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5
PRI service also has the capability to provision B-channels as superrate channels to satisfy the bandwidth requirements of higher bit rate services. These are called H-Channels and are provisioned as shown in the following minitable.
Channel H0 H10 H11 H12 Bandwidth 384 Kbps (6B) 1.472 Mbps (23B) 1.536 Mbps (24B) 1.920 Mbps (30B)
PBX Applications
The PRI s marketplace is the business community, and its primary advantage is pair gain, that is, to conserve copper pairs by multiplexing the traffic from multiple user channels onto a shared, four-wire circuit. Inasmuch as a PRI can deliver the equivalent of 23 voice channels to a location over a single circuit, it is an ideal technology for a number of applications. These include the interconnection of a PBX to a local switch, dynamic bandwidth allocation for higher-end videoconferencing applications, and an interconnection between an Internet Service Provider s (ISP s) network and that of the local telephone company. Some PBXs are ISDN-capable on the line (customer) side, meaning that they have the capability to deliver ISDN services to users that emulate the services that would be provided over a direct connection to an ISDN-provisioned local loop. On the trunk (switch) side, the PBX is connected to the local switch via one or more T1s, which in turn provide access to the telephone network. This arrangement results in significant savings, faster call setup, a more flexible administration of trunk resources, and the capability to offer a diversity of services through the granular allocation of bandwidth as required. Videoconferencing Videoconferencing, an application that now enjoys widespread acceptance in the market thanks to service providers like Proximity Systems and affordable, effective video compressor/ decompressors (CODECs) from companies like PolyCom and Tandberg, has moved from the boardroom to the home office and everywhere in between. Although BRI provides adequate bandwidth for casual conferencing on a reduced-size PC screen, PRI is preferable for high-quality,
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