Understand where each of the terms is used in a Frame Relay network.
Remember that a DTE is typically the router; the DCE is typically the CSU/DSU and switch located at the provider.
Key Terms and Concepts
central office (CO)
Point at which the local loop gains access to the service provider’s high-speed trunk lines. This is often referred to as a point of presence (POP).
data communication equipment (DCE)
Specific communications equipment, such as packet switches, that interface between a PSE and DTE devices. DCEs are typically found in carrier facilities.
data terminal equipment (DTE)
End-systems that communicate over an X.25 network (such as host systems, terminals, and PCs that belong to the individual subscriber) and that are present at the same site.
demarcation point (demarc)
The boundary between the customer’s in-house wiring and the service provider’s wiring. This is the point where the service provider’s responsibility ends.
local loop
Wiring running from the demarc to the CO.
packet switching exchange (PSE)
Switches that constitute the majority of a carrier’s network and handle the transfer of data between DTE devices via the X.25 packet-switched network.
permanent virtual circuit (PVC)
An established connection used for recurrent, steady data transfer. PVC sessions are continuously active, so DTEs can transmit data whenever necessary.
switched virtual circuit (SVC)
A temporary connection used for intermittent data transfers. When using an SVC, DTE devices must establish, maintain, and then terminate a session every time they need to communicate.
Related posts:
- key Frame Relay Terms and Features
- Layered Model Exam Points
- Monitor Frame Relay Operation in the Router
- Frame Relay LMIs, Maps, and Subinterfaces
- Commands to Configure Frame Relay LMIs, Maps, and Subinterfaces
- ISDN Protocols, Function Groups, Reference Points, and Channels
- TCP-IP Network-layer protocol Exam Points
- OSI Network layer Exam Points
- Network Congestion Problem in Ethernet Networks
- Network Addressing Exams Points
