Differences Between ISDN and DSL

Computers & TechnologyTechnology

  • Author Eugene Alcide
  • Published February 23, 2018
  • Word count 533

Cloud telephone systems & VoIP telephone systems are becoming the go-to solution for business telephone systems. Many businesses are switching from DSL & ISDN to future-proof VoIP.


Integrated Services Digital Network (ISDN): ISDN is a digital transmission system, which is used to transmit voice and data through copper telephone wires. In other words, it's a circuit-switched data transmission system that is used for voice and data transmission over the wire.

Digital Subscriber Line (DSL): DSL is also a digital transmission system and utilises already installed copper wires to send voice and data packets.


As far as the differences between ISDN and DSL transmission system are concerned, there are several differences one can find:


In terms of speed, DSL is faster than ISDN. DSL sends data packets with speeds ranging from 128Kbps to over 100 Mbps using latest DSL standards such as VDSLv2. On the other hand, ISDN comes in two different speeds i.e., 64Kbps and 128Kbps.


In terms of price, ISDN is somewhat more expensive than DSL. The main reason is that DSL utilises wires that are already installed in homes or businesses, and there is no special line installation needed. However, ISDN lines need to be installed and connection charges vary depending on the connection you choose. In the case of dedicated or, "always on" connections – you will have to pay more as some ISDN packages are charged on per minute basis. A special dial-up package, on the other hand, will cost less and might be an easy option where a DSL connection is still not available. The price of a VoIP phone & virtual line is much more cost effective than traditional ISDN lines. Business telephone systems can be run over, ISDN, SIP & VoIP


ISDN is a dial-up service and transmits voice and data through a single line. There are two types of ISDN: Basic Rate Interface (BRI) and Primary Rate Interface (PRI). BRI is used mostly for residential homes and comes with three channels. On the other hand, Primary Rate Interface (PRI) ISDN is a business version and comes with 24 channels. In this case, 23 B channels are used to transmit voice, data and video – all through the same wire. A D channel carries low-speed data and signalling. This signalling is used to generate alarm signals and provide support for non-voice functions. ISDN does not transmit data through analogue lines. Of course, it is better to run business telephone systems over SIP & VoIP

DSL connections are often referred to as "always on" connections, so don't do not need to dial up a number. In DSL, there is only a single route for carrying voice, data and video. Two types of DSL connections are wide: (SDSL) and Asymmetric DSL (ADSL). These two types of DSL connections differ in their data carrying capacities i.e., upload and download. For more downloading, ADSL is a better choice. Business telephone systems are critical & need to be reviewed every 3-5 years.

ISDN and DSL are both distance sensitive. To get either service, your place should not be more than 18Free Web Content,000 feet away from the central office. Cloud telephone systems & VoIP telephone systems are the go-to solution & your business gets free Call recording.

This article was produced by a business telephone systems expert, you should review your telephone systems every 3-5.

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