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
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....