Chapter 2: About the HSIM-W614 HSIM-W6 User’s GuideISDNISDN provides an inexpensive switched digital access to remote sites. The ISDN BRI standardprovides for two high speed 64 Kbps bearer (B) channels used for voice or data connections andone 16 Kbps signaling data (D) channel used for call setup, signaling and other information. ISDNallows all types of information to be transmitted including voice, data, fax and video. Multipledevices can be linked to a single ISDN connection, each having their own telephone number. Twoor more channels can be combined into a single larger transmission pipe offering variabletransmission speeds.The HSIM-W6 supports one ISDN BRI line and either or both of the B channels for transferringdata. If the two B channels are used for separate connections, each provides up to 64 Kbps transferrates. Both channels can be used together to provide uncompressed data transfer at up to 128 Kbps.The HSIM-W6 can also transfer compressed data at up to 512 Kbps.A Network Terminator device (NT1) provides the interface between ISDN terminal (router)equipment and the ISDN service provider. In the U.S., the NT1 is provided by the customer;outside the U.S., the NT1 is provided by the ISDN service provider. The HSIM-W6 supports theWPIM-S/T that provides an S/T interface requiring an external NT1.Telephone Switch SupportThe following telephone switch types are supported within the U.S.:• National ISDN 1 (NI-1)• AT&T 5ESS w/Custom Software• DMS-100Outside of the U.S. the following switch types are supported:• NET3 (European ISDN)• NET3SW (European Swiss-variant)• NTT (Nippon Telegraph and Telephone)• KDD (Kokusai Denshin Denwa Co., Ltd.)• French Delta (VN4) switches
