tailieunhanh - ACCESS POINTS ON NARROWBAND DATA CIRCUITS IN MODERN

Today’s transmission methods and equipment are robust and reliable and feature integrated network monitoring, troubleshooting, maintenance, and provisioning systems. However, public carriers and most major private networks have historically engineered their network’s physical plant to include access points at which they can gain quick and organized “hard-contact” access to any particular circuit path. Typically, these access points were comprised of analog jackfields with “line-drop-monitor” access capability. With these jackfields, craftpersons could passively monitor and/or intrusively test circuits, or perform circuit reconfigurations to bypass faulty paths or accommodate changes in traffic patterns | Access Points On Narrowband Data Circuits in Modern Carrier Environments Network Tech Control White Paper Today s transmission methods and equipment are robust and reliable and feature integrated network monitoring troubleshooting maintenance and provisioning systems. However public carriers and most major private networks have historically engineered their network s physical plant to include access points at which they can gain quick and organized hard-contact access to any particular circuit path. Typically these access points were comprised of analog jackfields with line-drop-monitor access capability. With these jackfields craftpersons could passively monitor and or intrusively test circuits or perform circuit reconfigurations to bypass faulty paths or accommodate changes in traffic patterns. Figure 1 With the transition to the modern digital network hierarchy with increased bandwidth these analog jackfield bays gave way to more functional DSX-1 and DSX-3 systems. A typical DSX-1 bay is shown in Figure 1. Today we also see this hard contact access philosophy extending into our emerging optical network transmission systems. The reasons for this philosophy as evidenced in virtually every telephone office and even many outside plant OSP locations are simple. While networks are increasingly sophisticated and self healing the simple fact remains that physical things will break and require physical intervention and thus the way to restore or reroute service is to change the physical arrangement of the circuit path. As a result providing easy access to networks continues to be a popular practice. Increasingly carrier networks are being invaded with types of circuits on media different from the traditional telco circuit physical plant. A rapidly growing share of office cabling are low speed data circuits on RS232 and ANSI EIA-530 interfaces. Ill Network Tech Control White Paper Applications The first significant application to bring these new interfaces to the .