Which type of cabling is used for ISDN network?

ISDN (Integrated Services Digital Network) typically uses twisted pair cabling, specifically the Category 5 (Cat 5) or higher cables for its Basic Rate Interface (BRI) services. For Primary Rate Interface (PRI) connections, which carry more channels, coaxial cables or fiber optic cables may be used, depending on the distance and bandwidth requirements. Overall, twisted pair cabling is the most common for ISDN installations.