A regional network providing Internet connectivity to the University of Rochester and several other local organizations. Layer 1 Physical - the cables and electronics. Layer 6 Presentation - ensures communication between applications by translating data structures, formats and codes. Layer 7 Application - provides the interface by which the user interacts with the network. OTDR Optical Time-Domain Reflectometer, used to find flaws in fiber optic cable.
Packet switch A device that moves packets from one network to another.
PhoneNet AppleTalk running on twisted pair copper wiring, using adapters. The physical point of interface between two networks, in this realm typically the demarcation connectors between a departmental cable and a backbone device. Printer sharing A service provided by most network protocols which allows one printer to be used by several hosts. A network topology in which each host connects to two others, and data flows from one host to the next around the ring. The phone switch used by the University, it can provide both voice and low-speed data services.