Complete Protocol dictionary, glossary and reference
IDSL: ISDN Digital Subscriber Line
ISDN Digital Subscriber Line (IDSL) is a technology allowing existing ISDN subscribers to access the Internet using POTS dial service. Similar to ISDN, IDSL uses a single-wire pair to transmit full-duplex data at 128 kbps and at distances of up to RRD range, and IDSL uses a 2B1Q line code to enable transparent operation through the ISDN "U" interface. Also, the user can use existing ISDN CPE to make the CO connections. However, unlike ISDN, ISDL is terminated at the Service Provider by a data equipment instead of through the voice switch.