ISDN30 Beginners Guide

ISDN 30 is a primary fee service. It is obtainable in DASS, I.421 and ISDN30e variations. ISDN30 DASS. ISDN 30 (DASS 2) conforms to BT’s own typical (see I.421 for Euro edition). ISDN 30 is the equal of up to 30 exchange traces (Channels) sent to the customer’s premises and connected to a PBX (such a Mitel 3300 mobile phone system) or for data applications to Computer system or multiplexor this kind of as the BT Jtec.

ISDN 30 (DASS 2) is available from only 8 channels upwards and therefore applicable to customers of all measurements. ISDN 30 (DASS 2) is delivered typically over fiber cable but can be delivered in excess of transverse display screen, Microwave or copper pairs. Each and every system is a 2Mbit/s electronic connection from the BT exchange offered as a G703 BNC connector. 


ISDN30(I.421) is the European typical for digital connection to ISDN Principal level company. This takes advantage of the Q931 signaling protocol, conference the European Telecom Standards Institute (ETSI) specification, which conforms to the ITU-T (formerly known as CCITT) standards.

ISDN30(I.421) is the equal of up to 30 trade strains (identified as Channels) delivered to the customer’s premises and related to an iSPBX or for information applications to a Personal computer or multiplexer. It is accessible from only 8 channels upward and hence relevant to all sizes of customer.

ISDN30(I.421) is furnished generally in excess of fibre cable but can be presented about transverse screen, microwave or copper pairs. Each method is a 2Mbit/s digital relationship from the BT trade presented as an RJ45 connector.


ISDN30e an enhancement to the ISDN 30(I.421) provider.  ISDN 30e is supplied with the newest community software program, which gives buyers with access to Supplementary products and services these kinds of as Simply call Forwarding of Voice and Facts calls. ISDN 30e will also permit the provision of new solutions in the long run these types of as Buyer Managed Phone Forwarding.

Current ISDN 30 (I.421) shopper installations will be unaffected and will not be automatically increased. ISDN 30e is supplied in excess of fibre, transverse display or copper. Every single technique is a 2Mbit/s electronic link from an trade introduced as an RJ45 connector. ISDN 30e makes use of the Q931 signaling protocol, and satisfies European Telecom Expectations Institute (ETSI) specifications. Improvement to the ISDN 30e company is free of charge of cost for ISDN 30(I.421) consumers. For ISDN 30(DASS) prospects, there is a charge for upgrading to ISDN 30e.

Primary variations between DASS and ISDN 30e/ISDN 30(I.421) are:

  • Signaling For the ISDN 30e/ISDN 30(I.421) service DASS 2 signaling is changed with Q931 signaling to the ETSI standard.
  • A new NTE For the ISDN 30e/ISDN 30(I.421) company the interface connector for the ISDN 30 (DASS 2) BNC 75Ohm Unbalanced (G703) is replaced with an I.421 socket, EN28877 (RJ45) 120-Ohm Balanced connector to the CCITT I.421 conventional.

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