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Asynchronous Transmission Overview	Isochronous Transmission Overview
Cabling-FAQ	Synchronous Data Link Control (SDLC) Overview
Frame Relay Overview	Switched Multimegabit Data Service (SMDS) Overview
ISDN Overview	SS7 Overview
Glossary of Satellite Terms and Acronyms	X.21 Overview
SONET / SDH Technical Summary	X.25 Packet layer Protocol (PLP) Overview
Telecommunications Dictionary	Network Cabling Dictionary 1
T1 Overview	Network Cabling Dictionary 2
T Carrier Technical Summary	Cable and Connector Suppliers
VSAT Technology	TCP/UDP Port Numbers