Figure 6.5: Trunk Line Technologies Trunk line Speed SONET/SDH OC3/STM1 156 Mbps OC12/STM4 622 Mbps OC48/STM16 2.5 Gbps OC 192/STM64 10 Gbps OC768/STM256 40 Gbps Notes: SONET, Synchronous Optica| NETWork,同步光纤网 sDH, Synchronous Digital hierarchy,同步数字系列 SoNET and Sdh speeds are multiples of 51.84 Mbps OCx is the sonet designation STMX is the SDH designation 6-16
6-16 Figure 6.5: Trunk Line Technologies Trunk Line Speed SONET/SDH* OC3/STM1 156 Mbps OC12/STM4 622 Mbps OC48/STM16 2.5 Gbps OC192/STM64 10 Gbps OC768/STM256 40 Gbps Notes: SONET, Synchronous Optical NETwork, 同步光纤网 SDH, Synchronous Digital Hierarchy,同步数字系列 SONET and SDH speeds are multiples of 51.84 Mbps. OCx is the SONET designation. STMx is the SDH designation
Figure 6.6: SONET/SDH Dual Rings Telephone m画可 Telephone Switch Switch SONET/SDH Ring Telephone Switch Rings can be Wrapped if a Telephone Trunk line Switch Is Broken SONET/SDH Ring (Ch.5) 6-17
6-17 Figure 6.6: SONET/SDH Dual Rings SONET/SDH Ring SONET/SDH Ring Telephone Switch Telephone Switch Telephone Switch Telephone Switch Rings can be Wrapped if a Trunk line Is Broken (Ch. 5)
Figure67: Circuit Switching线路交 换 2. Across 1. Circuit Multiple End-to-End Connection Access Lines Switches and Subscriber-Subscriber Trunk lines 3. Circuit Switching Circuit reserved for Duration of Call 6-18
6-18 Figure 6.7: Circuit Switching 线路交 换 3. Circuit Switching: Circuit Reserved for Duration of Call 2. Across Multiple Access Lines, Switches, and Trunk Lines 1. Circuit End-to-End Connection Subscriber-Subscriber
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 6-20
6-20 Figure 6-1: Elements of the Public Switched Telephone Network (PSTN) 1. Customer Premises Equipment 1. Customer Premises Equipment