ISDN Insights | Sumble

What is ISDN?

ISDN (Integrated Services Digital Network) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network (PSTN). It was commonly used for faster internet access compared to dial-up, as well as for videoconferencing and PBX systems, but has largely been replaced by broadband technologies like DSL, cable internet, and fiber optics.

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What other technologies are related to ISDN?

ISDN Competitor Technologies

Centrex Systems

Centrex systems provided telephone exchange services from the central office, offering similar functionalities to ISDN for businesses. Offered alternatives to on-premise PBX systems for voice communication.

mentioned alongside ISDN in 98% (118) of relevant job posts

DSL

DSL (Digital Subscriber Line) is a technology for transmitting digital data over telephone lines. It is a competitor to ISDN, offering higher bandwidth for data applications.

mentioned alongside ISDN in 14% (685) of relevant job posts

T-1s

T-1 lines provided dedicated bandwidth for voice and data, often competing with ISDN for business connectivity.

mentioned alongside ISDN in 39% (163) of relevant job posts

Key Systems

Key systems were simpler telephone systems often used in smaller businesses, providing an alternative to ISDN for basic phone services.

mentioned alongside ISDN in 45% (126) of relevant job posts

Frame Relay

Frame Relay is a packet-switching technology that competed with ISDN for wide area network connectivity, especially for data transmission.

mentioned alongside ISDN in 15% (365) of relevant job posts

T1

T1 lines provided dedicated bandwidth for voice and data, often competing with ISDN for business connectivity.

mentioned alongside ISDN in 12% (427) of relevant job posts

Leased Lines

Leased lines offered dedicated bandwidth connections, similar to T1 lines, and competed with ISDN for business network connectivity.

mentioned alongside ISDN in 25% (122) of relevant job posts

ATM

ATM (Asynchronous Transfer Mode) is a network technology that competed with ISDN for high-speed data and multimedia transmission.

mentioned alongside ISDN in 9% (328) of relevant job posts

ISDN Complementary Technologies

H.323

H.323 is a VoIP protocol suite that could be used over ISDN connections for voice and video conferencing, making them somewhat complementary.

mentioned alongside ISDN in 11% (451) of relevant job posts

SIP

SIP is a VoIP signaling protocol that is complementary to ISDN because it provides voice and video over IP, which could utilize ISDN as a transport mechanism.

mentioned alongside ISDN in 4% (1.2k) of relevant job posts

MGCP

MGCP is a VoIP control protocol that is complementary to ISDN because it provides voice and video over IP, which could utilize ISDN as a transport mechanism.

mentioned alongside ISDN in 13% (302) of relevant job posts