复旦大学：《计算机网络 Computer Networking》课程教学资源（PPT课件讲稿）Telecommunications

Telecommunications Chapter 6 Updated January 2009 XU Zhengchuan Fudan University

XU Zhengchuan Fudan University Telecommunications Chapter 6 Updated January 2009

Telecommunications · From Chapter1: Data communications Telecommunications: Voice and Video Communications RV HIN 6-2

6-2 Telecommunications • From Chapter 1: – Data communications – Telecommunications: Voice and Video Communications

Technical elements of the Public switched Telephone Network

Technical Elements of the Public Switched Telephone Network

Figure 6-1: Elements of the Public Switched Telephone Network (PSTN) 1. Customer Premises Customer Premises Equipment Equipment 6-4

6-4 Figure 6-1: Elements of the Public Switched Telephone Network (PSTN) 1. Customer Premises Equipment 1. Customer Premises Equipment

Figure 6-2: Customer Premises Equipment Site Handset PBX 4-Pair UTP Telephone Wiring Ⅲ[ PSTN A typical business site The private branch exchange is an internal switch for the site 4-pair UTP was created for business premises telephone wiring Company is essentially its own telephone company that connects to the outside Pstn 6-5

6-5 Figure 6-2: Customer Premises Equipment PSTN PBX Handset 4-Pair UTP Telephone Wiring Site A typical business site. The private branch exchange is an internal switch for the site. 4-pair UTP was created for business premises telephone wiring Company is essentially its own telephone company that connects to the outside PSTN

Figure 6-1: Elements of the Public Switched Telephone Network(PSTN The Access System consists of the access line to the customer (called the local loop) and termination equipment at the end office (nearest telephone office switch) 2 2. Access line Access Line (Local Loop) (Local Loop 2&3 end office Switch( Class 5) 6-6

6-6 Figure 6-1: Elements of the Public Switched Telephone Network (PSTN) 2. & 3. End Office Switch (Class 5) 2. Access Line (Local Loop) 2. Access Line (Local Loop) The Access System consists of the access line to the customer (called the local loop) and termination equipment at the end office (nearest telephone office switch)

Figure 6-1: Elements of the Public Switched elephone Network(PSTN) 3. Transport Core 3. Switch 3. Trunk Line The Transport core connects end office switches and core switches Trunk lines connect switches 6-7

6-7 Figure 6-1: Elements of the Public Switched Telephone Network (PSTN) 3. Transport Core 3. Trunk Line 3. Switch The Transport Core connects end office switches and core switches. Trunk lines connect switches

Figure 6-1: Elements of the PSTN Telephone Company Switch " t 22国 ,是 6-8

6-8 Figure 6-1: Elements of the PSTN • Telephone Company Switch

Figure 6-1: Elements of the Public Switched Telephone Network(PSTN) 净 4. Signaling System Transport is the actual transmission of voice Signaling is the control of calling (setup, teardown, billing, etc. SS7 in the United States C7 in Europe 6-9

6-9 Figure 6-1: Elements of the Public Switched Telephone Network (PSTN) 4. Signaling System Transport is the actual transmission of voice. Signaling is the control of calling (setup, teardown, billing, etc.). SS7 in the United States C7 in Europe

Page 281 Test Your understanding 2 ·3b ·4acd 5 b 6-10

6-10 • Page 281 • Test Your understanding • 2 • 3 b • 4 a,c,d • 5 b